Portrait, 1580, Toruń Old Town City Hall
19 February 1473|
Toruń (Thorn), Royal Prussia, Kingdom of Poland
|Died||24 May 1543
Frombork (Frauenburg), Prince-Bishopric of Warmia, Royal Prussia, Kingdom of Poland
|Fields||Mathematics, astronomy, canon law, medicine, economics|
|Alma mater||University of Kraków
University of Bologna
University of Padua
University of Ferrara
Nicolaus Copernicus (German: Nikolaus Kopernikus; Polish: Mikołaj Kopernik (help·info); 19 February 1473 – 24 May 1543) was a Renaissance mathematician and astronomer who formulated a heliocentric model of the universe which placed the Sun, rather than the Earth, at the center.
The publication of Copernicus' book, De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), just before his death in 1543, is considered a major event in the history of science. It began the Copernican Revolution and contributed importantly to the rise of the ensuing Scientific Revolution.
Copernicus was born and died in Royal Prussia, a region of the Kingdom of Poland since 1466. Copernicus had a doctorate in canon law and, though without degrees, was a physician, polyglot, classics scholar, translator, governor, diplomat, and economist who in 1517 set down a quantity theory of money, a principal concept in economics to the present day, and formulated a version of Gresham's Law in the year 1519, before Gresham.
Nicolaus Copernicus was born on 19 February 1473 in the city of Toruń (Thorn), in the province of Royal Prussia, in the Crown of the Kingdom of Poland. His father was a merchant from Kraków and his mother was the daughter of a wealthy Toruń merchant. Nicolaus was the youngest of four children. His brother Andreas (Andrew) became an Augustinian canon at Frombork (Frauenburg). His sister Barbara, named after her mother, became a Benedictine nun and, in her final years (she died after 1517), prioress of a convent in Chełmno (Kulm). His sister Katharina married the businessman and Toruń city councilor Barthel Gertner and left five children, whom Copernicus looked after to the end of his life. Copernicus never married or had children.
The father’s family can be traced to a village in Silesia near Nysa (Neiße). The village's name has been variously spelled Kopernik, Köppernig, Köppernick, and today Koperniki. In the 14th century, members of the family began moving to various other Silesian cities, to the Polish capital, Kraków (Cracow, 1367), and to Toruń (1400). The father, likely the son of Jan, came from the Kraków line.
Nicolaus was named after his father, who appears in records for the first time as a well-to-do merchant who dealt in copper, selling it mostly in Danzig (Gdańsk). He moved from Kraków to Toruń around 1458. Toruń, situated on the Vistula River, was at that time embroiled in the Thirteen Years' War (1454–66), in which the Kingdom of Poland and the Prussian Confederation, an alliance of Prussian cities, gentry and clergy, fought the Teutonic Order over control of the region. In this war Hanseatic cities like Danzig and Toruń, the hometown of Nicolaus Copernicus, chose to support the Polish king, who promised to respect the cities' traditional vast independence, which the Teutonic Order had challenged.
Nicolaus' father was actively engaged in the politics of the day and supported Poland and the cities against the Teutonic Order. In 1454 he mediated negotiations between Poland’s Cardinal Zbigniew Oleśnicki and the Prussian cities for repayment of war loans. In the Second Peace of Thorn (1466), the Teutonic Order formally relinquished all claims to its western provinces, which as Royal Prussia remained a region of Poland for the next 300 years.
The father married Barbara Watzenrode, the astronomer's mother, between 1461 and 1464. He died sometime between 1483 and 1485. Upon the father’s death, young Nicolaus’ maternal uncle, Lucas Watzenrode the Younger (1447–1512), took the boy under his protection and saw to his education and career.
Nicolaus’ mother, Barbara Watzenrode, was the daughter of Lucas Watzenrode the Elder and his wife Katherine (née Modlibóg). Not much is known about her life, but she is believed to have died when Nicolaus was a small boy. The Watzenrodes had come from the Schweidnitz (Świdnica) region of Silesia and had settled in Toruń after 1360, becoming prominent members of the city’s patrician class. Through the Watzenrodes' extensive family relationships by marriage, they were related to wealthy families of Toruń, Danzig and Elbląg (Elbing), and to the prominent Czapski, Działyński, Konopacki and Kościelecki noble families. The Modlibógs (literally, in Polish, "Pray to God") were a prominent Polish family who had been well known in Poland's history since 1271. Lucas and Katherine had three children: Lucas Watzenrode the Younger, who would become Copernicus' patron; Barbara, the astronomer's mother; and Christina, who in 1459 married the merchant and mayor of Toruń, Tiedeman von Allen.
Lucas Watzenrode the Elder was well regarded in Toruń as a devout man and honest merchant, and he was active politically. He was a decided opponent of the Teutonic Knights and an ally of Polish King Casimir IV Jagiellon. In 1453 he was the delegate from Toruń at the Grudziądz (Graudenz) conference that planned to ally the cities of the Prussian Confederation with Casimir IV in their subsequent war against the Teutonic Knights. During the Thirteen Years' War that ensued the following year, he actively supported the war effort with substantial monetary subsidies, with political activity in Toruń and Danzig, and by personally fighting in battles at Łasin (Lessen) and Malbork (Marienburg). He died in 1462.
Lucas Watzenrode the Younger, the astronomer's maternal uncle and patron, was educated at the University of Kraków (now Jagiellonian University) and at the universities of Cologne and Bologna. He was a bitter opponent of the Teutonic Order, and its Grand Master once referred to him as "the devil incarnate". In 1489 Watzenrode was elected Bishop of Warmia (Ermeland, Ermland) against the preference of King Casimir IV, who had hoped to install his own son in that seat. As a result, Watzenrode quarreled with the king until Casimir IV’s death three years later. Watzenrode was then able to form close relations with three successive Polish monarchs: John I Albert, Alexander Jagiellon, and Sigismund I the Old. He was a friend and key advisor to each ruler, and his influence greatly strengthened the ties between Warmia and Poland proper. Watzenrode came to be considered the most powerful man in Warmia, and his wealth, connections and influence allowed him to secure Copernicus’ education and career as a canon at Frombork Cathedral.
Copernicus is postulated to have spoken Latin, German, and Polish with equal fluency. He also spoke Greek and Italian. The vast majority of Copernicus’ surviving works are in Latin, which in his lifetime was the language of academia in Europe. Latin was also the official language of the Roman Catholic Church and of Poland's royal court, and thus all of Copernicus’ correspondence with the Church and with Polish leaders was in Latin.
There survive a few documents written by Copernicus in German. Martin Carrier mentions this as a reason to consider Copernicus’ native language to have been German. Other arguments are that Copernicus was born in a predominantly German-speaking town and that, while studying canon law at Bologna in 1496, he signed into the German natio (Natio Germanorum)—a student organization which, according to its 1497 by-laws, was open to students of all kingdoms and states whose mother-tongue ("Muttersprache") was German.
However, according to French philosopher Alexandre Koyré, this in itself does not imply that Copernicus considered himself German, since students from Prussia and Silesia were routinely placed in that category, which carried certain privileges that made it a natural choice for German-speaking students, regardless of their ethnicity or self-identification.
In Copernicus' time, people were often called after the places where they lived. Like the Silesian village that inspired it, Copernicus' surname has been spelled variously. The English-speaking world knows the astronomer principally by the Latinized name, "Nicolaus Copernicus".
The surname likely had something to do with the local Silesian copper-mining industry, though some scholars assert that it may have been inspired by the dill plant (in Polish, "koperek" or "kopernik") that grows wild in Silesia.
As was to be the case with William Shakespeare a century later, numerous spelling variants of the name are documented for the astronomer and his relatives. The name first appeared as a place name in Silesia in the 13th century, where it was spelled variously in Latin documents. Copernicus "was rather indifferent about orthography". During his childhood, the name of his father (and thus of the future astronomer) was recorded in Thorn as Niclas Koppernigk around 1480. At Kraków he signed his name "Nicolaus Nicolai de Torunia". At Bologna in 1496, he registered in the Matricula Nobilissimi Germanorum Collegii resp. Annales Clarissimae Nacionis Germanorum of the Natio Germanica Bononiae as Dominus Nicolaus Kopperlingk de Thorn – IX grosseti. At Padua, Copernicus signed his name "Nicolaus Copernik", later as "Coppernicus". He signed a self-portrait, a copy of which is now at Jagiellonian University, "N Copernic". The astronomer Latinized his name to Coppernicus, generally with two "p"s (in 23 of 31 documents studied), but later in life he used a single "p". On the title page of De revolutionibus, Rheticus published the name as (in the genitive, or possessive, case) "Nicolai Copernici".
Copernicus' uncle Watzenrode maintained contacts with the leading intellectual figures in Poland and was a friend of the influential Italian-born humanist and Kraków courtier, Filippo Buonaccorsi. Watzenrode seems first to have sent young Copernicus to the St. John's School at Thorn where he himself had been a master. Later, according to Armitage (some scholars differ), the boy attended the Cathedral School at Włocławek, up the Vistula River from Thorn, which prepared pupils for entrance to the University of Kraków, Watzenrode's alma mater in Poland's capital.
In the winter semester of 1491–92 Copernicus, as "Nicolaus Nicolai de Thuronia", matriculated together with his brother Andrew at the University of Kraków (now Jagiellonian University). Copernicus began his studies in the Department of Arts (from the fall of 1491, presumably until the summer or fall of 1495) in the heyday of the Kraków astronomical-mathematical school, acquiring the foundations for his subsequent mathematical achievements. According to a later but credible tradition (Jan Brożek), Copernicus was a pupil of Albert Brudzewski, who by then (from 1491) was a professor of Aristotelian philosophy but taught astronomy privately outside the university; Copernicus became familiar with Brożek's widely read commentary to Georg von Peuerbach's Theoricæ novæ planetarum and almost certainly attended the lectures of Bernard of Biskupie and Wojciech Krypa of Szamotuły and probably other astronomical lectures by Jan of Głogów, Michael of Wrocław (Breslau), Wojciech of Pniewy and Marcin Bylica of Olkusz.
Copernicus' Kraków studies gave him a thorough grounding in the mathematical-astronomical knowledge taught at the university (arithmetic, geometry, geometric optics, cosmography, theoretical and computational astronomy), a good knowledge of the philosophical and natural-science writings of Aristotle (De coelo, Metaphysics), stimulated his interest in learning, and made him conversant with humanistic culture. Copernicus broadened the knowledge that he took from the university lecture halls with independent reading of books that he acquired during his Kraków years (Euclid, Haly Abenragel, the Alfonsine Tables, Johannes Regiomontanus' Tabulae directionum); to this period, probably, also date his earliest scientific notes, now preserved partly at Uppsala University. At Kraków Copernicus began collecting a large library on astronomy; it would later be carried off as war booty by the Swedes during the Deluge (mid-1600s) and is now at the Uppsala University Library.
Copernicus' four years at Kraków played an important role in the development of his critical faculties and initiated his analysis of the logical contradictions in the two most popular systems of astronomy—Aristotle's theory of homocentric spheres, and Ptolemy's mechanism of eccentrics and epicycles—the surmounting and discarding of which constituted the first step toward the creation of Copernicus' own doctrine of the structure of the universe.
Without taking a degree, probably in the fall of 1495, Copernicus left Kraków for the court of his uncle Watzenrode, who in 1489 had been elevated to Prince-Bishop of Warmia and soon (after November 1495) sought to place his nephew in a Warmia canonry vacated by 26 August 1495 death of its previous tenant. For unclear reasons—probably due to opposition from part of the chapter, who appealed to Rome—Copernicus' installation was delayed, inclining Watzenrode to send both his nephews to study canon law in Italy, seemingly with a view to furthering their ecclesiastic careers and thereby also strengthening his own influence in the Warmia chapter.
Leaving Warmia in mid-1496—possibly with the retinue of the chapter's chancellor, Jerzy Pranghe, who was going to Italy—in the fall (October?) of that year Copernicus arrived in Bologna and a few months later (after 6 January 1497) signed himself into the register of the Bologna University of Jurists' "German nation", which also included Polish youths from Silesia, Prussia and Pomerania as well as students of other nationalities.
It was only on 20 October 1497 that Copernicus, by proxy, formally succeeded to the Warmia canonry, which had been granted to him two years earlier. To this, by a document dated 10 January 1503 at Padua, he would add a sinecure at the Collegiate Church of the Holy Cross in Wrocław, Silesia, Bohemia. Despite having received a papal indult on 29 November 1508 to receive further benefices, through his ecclesiastic career Copernicus not only did not acquire further prebends and higher stations (prelacies) at the chapter, but in 1538 he relinquished the Breslau sinecure. It is uncertain whether he was ordained a priest; he may only have taken minor orders, which sufficed for assuming a chapter canonry.
During his three-year stay at Bologna, between fall 1496 and spring 1501, Copernicus seems to have devoted himself less keenly to studying canon law (he received his doctorate in law only after seven years, following a second return to Italy in 1503) than to studying the humanities—probably attending lectures by Filippo Beroaldo, Antonio Urceo, called Codro, Giovanni Garzoni and Alessandro Achillini—and to studying astronomy. He met the famous astronomer Domenico Maria Novara da Ferrara and became his disciple and assistant. Copernicus was developing new ideas inspired by reading the "Epitome of the Almagest" (Epitome in Almagestum Ptolemei) by George von Peuerbach and Johannes Regiomontanus (Venice, 1496). He verified its observations about certain peculiarities in Ptolemy's theory of the Moon's motion, by conducting on 9 March 1497 at Bologna a memorable observation of Aldebaran, the brightest star in the Taurus constellation, whose results reinforced his doubts as to the geocentric system. Copernicus the humanist sought confirmation for his growing doubts through close reading of Greek and Latin authors (Pythagoras, Aristarchos of Samos, Cleomedes, Cicero, Pliny the Elder, Plutarch, Philolaus, Heraclides, Ecphantos, Plato), gathering, especially while at Padua, fragmentary historic information about ancient astronomical, cosmological and calendar systems.
Copernicus spent the jubilee year 1500 in Rome, where he arrived with his brother Andrew that spring, doubtless to perform an apprenticeship at the Papal Curia. Here, too, however, he continued his astronomical work begun at Bologna, observing, for example, a lunar eclipse on the night of 5–6 November 1500. According to a later account by Rheticus, Copernicus also—probably privately, rather than at the Roman Sapienza—as a "Professor Mathematum" (professor of astronomy) delivered, "to numerous... students and... leading masters of the science", public lectures devoted probably to a critique of the mathematical solutions of contemporary astronomy.
On his return journey doubtless stopping briefly at Bologna, in mid-1501 Copernicus arrived back in Warmia. After on 28 July receiving from the chapter a two-year extension of leave in order to study medicine (since "he may in future be a useful medical advisor to our Reverend Superior [Bishop Lucas Watzenrode] and the gentlemen of the chapter"), in late summer or in the fall he returned again to Italy, probably accompanied by his brother Andrew and by Canon B. Sculteti. This time he studied at the University of Padua, famous as a seat of medical learning, and—except for a brief visit to Ferrara in May–June 1503 to pass examinations for, and receive, his doctorate in canon law—he remained at Padua from fall 1501 to summer 1503.
Copernicus studied medicine probably under the direction of leading Padua professors—Bartolomeo da Montagnana, Girolamo Fracastoro, Gabriele Zerbi, Alessandro Benedetti—and read medical treatises that he acquired at this time, by Valescus de Taranta, Jan Mesue, Hugo Senensis, Jan Ketham, Arnold de Villa Nova, and Michele Savonarola, which would form the embryo of his later medical library.
One of the subjects that Copernicus must have studied was astrology, since it was considered an important part of a medical education. However, unlike most other prominent Renaissance astronomers, he appears never to have practiced or expressed any interest in astrology.
As at Bologna, Copernicus did not limit himself to his official studies. It was probably the Padua years that saw the beginning of his Hellenistic interests. He familiarized himself with Greek language and culture with the aid of Theodorus Gaza's grammar (1495) and J.B. Chrestonius' dictionary (1499), expanding his studies of antiquity, begun at Bologna, to the writings of Bessarion, J. Valla and others. There also seems to be evidence that it was during his Padua stay that there finally crystallized the idea of basing a new system of the world on the movement of the Earth.
As the time approached for Copernicus to return home, in spring 1503 he journeyed to Ferrara where, on 31 May 1503, having passed the obligatory examinations, he was granted the degree of doctor of canon law. No doubt it was soon after (at latest, in fall 1503) that he left Italy for good to return to Warmia.
Having completed all his studies in Italy, 30-year-old Copernicus returned to Warmia, where – apart from brief journeys to Kraków and to nearby Prussian cities (Thorn, Danzig, Elbing, Graudenz, Malbork Marienburg, Königsberg (Królewiec) – he would live out the remaining 40 years of his life.
Copernicus was his uncle's secretary and physician from 1503 to 1510 (or perhaps till that uncle's death on 29 March 1512) and resided in the Bishop's castle at Lidzbark (Heilsberg), where he began work on his heliocentric theory. In his official capacity, he took part in nearly all his uncle's political, ecclesiastic and administrative-economic duties. From the beginning of 1504, Copernicus accompanied Watzenrode to sessions of the Royal Prussian diet held at Malbork and Elbląg and, write Dobrzycki and Hajdukiewicz, "participated... in all the more important events in the complex diplomatic game that ambitious politician and statesman played in defense of the particular interests of Prussia and Warmia, between hostility to the [Teutonic] Order and loyalty to the Polish Crown."
In 1504–12 Copernicus made numerous journeys as part of his uncle's retinue—in 1504, to Toruń and Danzig, to a session of the Royal Prussian Council in the presence of Poland's King Alexander Jagiellon; to sessions of the Prussian diet at Malbork (1506), Elbląg (1507) and Sztum (Stuhm) (1512); and he may have attended a Poznań (Posen) session (1510) and the coronation of Poland's King Sigismund I the Old in Kraków (1507). Watzenrode's itinerary suggests that in spring 1509 Copernicus may have attended the Kraków sejm.
It was probably on the latter occasion, in Kraków, that Copernicus submitted for printing at Jan Haller's press his translation, from Greek to Latin, of a collection, by the 7th-century Byzantine historian Theophylact Simocatta, of 85 brief poems called Epistles, or letters, supposed to have passed between various characters in a Greek story. They are of three kinds—"moral," offering advice on how people should live; "pastoral", giving little pictures of shepherd life; and "amorous", comprising love poems. They are arranged to follow one another in a regular rotation of subjects. Copernicus had translated the Greek verses into Latin prose, and he now published his version as Theophilacti scolastici Simocati epistolae morales, rurales et amatoriae interpretatione latina, which he dedicated to his uncle in gratitude for all the benefits he had received from him. With this translation, Copernicus declared himself on the side of the humanists in the struggle over the question whether Greek literature should be revived. Copernicus' first poetic work was a Greek epigram, composed probably during a visit to Kraków, for Johannes Dantiscus' epithalamium for Barbara Zapolya's 1512 wedding to King Zygmunt I the Old.
Some time before 1514, Copernicus wrote an initial outline of his heliocentric theory known only from later transcripts, by the title (perhaps given to it by a copyist), Nicolai Copernici de hypothesibus motuum coelestium a se constitutis commentariolus—commonly referred to as the Commentariolus. It was a succinct theoretical description of the world's heliocentric mechanism, without mathematical apparatus, and differed in some important details of geometric construction from De revolutionibus; but it was already based on the same assumptions regarding Earth's triple motions. The Commentariolus, which Copernicus consciously saw as merely a first sketch for his planned book, was not intended for printed distribution. He made only a very few manuscript copies available to his closest acquaintances, including, it seems, several Kraków astronomers with whom he collaborated in 1515–30 in observing eclipses. Tycho Brahe would include a fragment from the Commentariolus in his own treatise, Astronomiae instauratae progymnasmata, published in Prague in 1602, based on a manuscript that he had received from the Bohemian physician and astronomer Tadeáš Hájek, a friend of Rheticus. The Commentariolus would appear complete in print for the first time only in 1878.
In 1510 or 1512 Copernicus moved to Frombork, a town to the northwest at the Vistula Lagoon on the Baltic Sea coast. There, in April 1512, he participated in the election of Fabian of Lossainen as Prince-Bishop of Warmia. It was only in early June 1512 that the chapter gave Copernicus an "external curia"—a house outside the defensive walls of the cathedral mount. In 1514 he purchased the northwestern tower within the walls of the Frombork stronghold. He would maintain both these residences to the end of his life, despite the devastation of the chapter's buildings by a raid against Frauenburg carried out by the Teutonic Order in January 1520, during which Copernicus' astronomical instruments were probably destroyed. Copernicus conducted astronomical observations in 1513–16 presumably from his external curia; and in 1522–43, from an unidentified "small tower" (turricula), using primitive instruments modeled on ancient ones—the quadrant, triquetrum, armillary sphere. At Frombork Copernicus conducted over half of his more than 60 registered astronomical observations.
Having settled permanently at Frombork, where he would reside to the end of his life, with interruptions in 1516–19 and 1520–21, Copernicus found himself at the Warmia chapter's economic and administrative center, which was also one of Warmia's two chief centers of political life. In the difficult, politically complex situation of Warmia, threatened externally by the Teutonic Order's aggressions (attacks by Teutonic bands; the Polish-Teutonic War of 1519–21; Albert's plans to annex Warmia), internally subject to strong separatist pressures (the selection of the prince-bishops of Warmia; currency reform), he, together with part of the chapter, represented a program of strict cooperation with the Polish Crown and demonstrated in all his public activities (the defense of his country against the Order's plans of conquest; proposals to unify its monetary system with the Polish Crown's; support for Poland's interests in the Warmia dominion's ecclesiastic administration) that he was consciously a citizen of the Polish-Lithuanian Republic. Soon after the death of uncle Bishop Watzenrode, he participated in the signing of the Second Treaty of Piotrków Trybunalski (7 December 1512), governing the appointment of the Bishop of Warmia, declaring, despite opposition from part of the chapter, for loyal cooperation with the Polish Crown.
That same year (before 8 November 1512) Copernicus assumed responsibility, as magister pistoriae, for administering the chapter's economic enterprises (he would hold this office again in 1530), having already since 1511 fulfilled the duties of chancellor and visitor of the chapter's estates.
His administrative and economic dutes did not distract Copernicus, in 1512–15, from intensive observational activity. The results of his observations of Mars and Saturn in this period, and especially a series of four observations of the Sun made in 1515, led to discovery of the variability of Earth's eccentricity and of the movement of the solar apogee in relation to the fixed stars, which in 1515–19 prompted his first revisions of certain assumptions of his system. Some of the observations that he made in this period may have had a connection with a proposed reform of the Julian calendar made in the first half of 1513 at the request of the Bishop of Fossombrone, Paul of Middelburg. Their contacts in this matter in the period of the Fifth Lateran Council were later memorialized in a complimentary mention in Copernicus' dedicatory epistle in De revolutionibus orbium coelestium and in a treatise by Paul of Middelburg, Secundum compendium correctionis Calendarii (1516), which mentions Copernicus among the learned men who had sent the Council proposals for the calendar's emendation.
During 1516–21, Copernicus resided at Olsztyn (Allenstein) Castle as economic administrator of Warmia, including Olsztyn (Allenstein) and Pieniężno (Mehlsack). While there, he wrote a manuscript, Locationes mansorum desertorum (Locations of Deserted Fiefs), with a view to populating those fiefs with industrious farmers and so bolstering the economy of Warmia. When Olsztyn was besieged by the Teutonic Knights during the Polish–Teutonic War (1519–21), Copernicus directed the defense of Olsztyn and Warmia by Royal Polish forces. He also represented the Polish side in the ensuing peace negotiations.
Copernicus for years advised the Royal Prussian diet, Duke Albert of Prussia (against whom Copernicus had defended Warmia in the Polish-Teutonic War), and Poland's King Sigismund I the Old on monetary reform. He participated in discussions in the Ducal Prussian diet about coinage reform in the Prussian countries; a question that concerned the diet was who had the right to mint coin. Political developments in Prussia culminated in the 1525 establishment of the Duchy of Prussia as a Protestant state in vassalage to Poland.
In 1526 Copernicus wrote a study on the value of money, Monetae cudendae ratio. In it he formulated an early iteration of the theory, now called Gresham's Law, that "bad" (debased) coinage drives "good" (un-debased) coinage out of circulation—several decades before Thomas Gresham. He also, in 1517, set down a quantity theory of money, a principal concept in economics to the present day. Copernicus' recommendations on monetary reform were widely read by leaders of both Prussia and Poland in their attempts to stabilize currency.
In 1533, Johann Widmanstetter, secretary to Pope Clement VII, explained Copernicus' heliocentric system to the Pope and two cardinals. The Pope was so pleased that he gave Widmanstetter a valuable gift. In 1535 Bernard Wapowski wrote a letter to a gentleman in Vienna, urging him to publish an enclosed almanac, which he claimed had been written by Copernicus. This is the only mention of a Copernicus almanac in the historical records. The "almanac" was likely Copernicus' tables of planetary positions. Wapowski's letter mentions Copernicus' theory about the motions of the earth. Nothing came of Wapowski's request, because he died a couple of weeks later.
Following the death of Prince-Bishop of Warmia Mauritius Ferber (1 July 1537), Copernicus participated in the election of his successor, Johannes Dantiscus (20 September 1537). Copernicus was one of four candidates for the post, written in at the initiative of Tiedemann Giese; but his candidacy was actually pro forma, since Dantiscus had earlier been named coadjutor bishop to Ferber. At first Copernicus maintained friendly relations with the new Prince-Bishop, assisting him medically in spring 1538 and accompanying him that summer on an inspection tour of Chapter holdings. But that autumn, their friendship was strained by suspicions over Copernicus' housekeeper, Anna Schilling, whom Dantiscus removed from Frombork in 1539.
In his younger days, Copernicus the physician had treated his uncle, brother and other chapter members. In later years he was called upon to attend the elderly bishops who in turn occupied the see of Warmia—Mauritius Ferber and Johannes Dantiscus — and, in 1539, his old friend Tiedemann Giese, Bishop of Chełmno (Kulm). In treating such important patients, he sometimes sought consultations from other physicians, including the physician to Duke Albert and, by letter, the Polish Royal Physician.
In the spring of 1541, Duke Albert summoned Copernicus to Königsberg to attend the Duke's counselor, George von Kunheim, who had fallen seriously ill, and for whom the Prussian doctors seemed unable to do anything. Copernicus went willingly; he had met von Kunheim during negotiations over reform of the coinage. And Copernicus had come to feel that Albert himself was not such a bad person; the two had many intellectual interests in common. The Chapter readily gave Copernicus permission to go, as it wished to remain on good terms with the Duke, despite his Lutheran faith. In about a month the patient recovered, and Copernicus returned to Frombork. For a time, he continued to receive reports on von Kunheim's condition, and to send him medical advice by letter.
Throughout this period of his life, Copernicus continued making astronomical observations and calculations, but only as his other responsibilities permitted and never in a professional capacity.
Some of Copernicus' close friends turned Protestant, but Copernicus never showed a tendency in that direction. The first attacks on him came from Protestants. Wilhelm Gnapheus, a Dutch refugee settled in Elbląg, wrote a comedy in Latin, Morosophus (The Foolish Sage), and staged it at the Latin school that he had established there. In the play, Copernicus was caricatured as a haughty, cold, aloof man who dabbled in astrology, considered himself inspired by God, and was rumored to have written a large work that was moldering in a chest.
Elsewhere Protestants were the first to react to news of Copernicus' theory. Melanchthon wrote:
Nevertheless, in 1551, eight years after Copernicus' death, astronomer Erasmus Reinhold published, under the sponsorship of Copernicus' former military adversary, the Protestant Duke Albert, the Prussian Tables, a set of astronomical tables based on Copernicus' work. Astronomers and astrologers quickly adopted it in place of its predecessors.
Some time before 1514 Copernicus made available to friends his "Commentariolus" ("Little Commentary"), a forty-page manuscript describing his ideas about the heliocentric hypothesis. It contained seven basic assumptions (detailed below). Thereafter he continued gathering data for a more detailed work.
About 1532 Copernicus had basically completed his work on the manuscript of De revolutionibus orbium coelestium; but despite urging by his closest friends, he resisted openly publishing his views, not wishing—as he confessed—to risk the scorn "to which he would expose himself on account of the novelty and incomprehensibility of his theses."
In 1533, Johann Albrecht Widmannstetter delivered a series of lectures in Rome outlining Copernicus' theory. Pope Clement VII and several Catholic cardinals heard the lectures and were interested in the theory. On 1 November 1536, Cardinal Nikolaus von Schönberg, Archbishop of Capua, wrote to Copernicus from Rome:
Some years ago word reached me concerning your proficiency, of which everybody constantly spoke. At that time I began to have a very high regard for you... For I had learned that you had not merely mastered the discoveries of the ancient astronomers uncommonly well but had also formulated a new cosmology. In it you maintain that the earth moves; that the sun occupies the lowest, and thus the central, place in the universe... Therefore with the utmost earnestness I entreat you, most learned sir, unless I inconvenience you, to communicate this discovery of yours to scholars, and at the earliest possible moment to send me your writings on the sphere of the universe together with the tables and whatever else you have that is relevant to this subject ...
By then Copernicus' work was nearing its definitive form, and rumors about his theory had reached educated people all over Europe. Despite urgings from many quarters, Copernicus delayed publication of his book, perhaps from fear of criticism—a fear delicately expressed in the subsequent dedication of his masterpiece to Pope Paul III. Scholars disagree on whether Copernicus' concern was limited to possible astronomical and philosophical objections, or whether he was also concerned about religious objections.
Copernicus was still working on De revolutionibus orbium coelestium (even if not certain that he wanted to publish it) when in 1539 Georg Joachim Rheticus, a Wittenberg mathematician, arrived in Frombork. Philipp Melanchthon, a close theological ally of Martin Luther, had arranged for Rheticus to visit several astronomers and study with them.
Rheticus became Copernicus' pupil, staying with him for two years and writing a book, Narratio prima (First Account), outlining the essence of Copernicus' theory. In 1542 Rheticus published a treatise on trigonometry by Copernicus (later included in the second book of De revolutionibus).
Under strong pressure from Rheticus, and having seen the favorable first general reception of his work, Copernicus finally agreed to give De revolutionibus to his close friend, Tiedemann Giese, bishop of Chełmno (Kulm), to be delivered to Rheticus for printing by the German printer Johannes Petreius at Nuremberg (Nürnberg), Germany. While Rheticus initially supervised the printing, he had to leave Nuremberg before it was completed, and he handed over the task of supervising the rest of the printing to a Lutheran theologian, Andreas Osiander.
Osiander added an unauthorised and unsigned preface, defending the work against those who might be offended by the novel hypotheses. He explained that astronomers may find different causes for observed motions, and choose whatever is easier to grasp. As long as a hypothesis allows reliable computation, it does not have to match what a philosopher might seek as the truth.
Toward the close of 1542, Copernicus was seized with apoplexy and paralysis, and he died at age 70 on 24 May 1543. Legend has it that he was presented with an advance copy of his De revolutionibus orbium coelestium on the very day that he died, allowing him to take farewell of his life's work. He is reputed to have awoken from a stroke-induced coma, looked at his book, and then died peacefully.
Copernicus was reportedly buried in Frombork Cathedral, where archaeologists for over two centuries searched in vain for his remains. Efforts to locate the remains in 1802, 1909, 1939 and 2004 had come to nought. In August 2005, however, a team led by Jerzy Gąssowski, head of an archaeology and anthropology institute in Pułtusk, after scanning beneath the cathedral floor, discovered what they believed to be Copernicus' remains.
The find came after a year of searching, and the discovery was announced only after further research, on 3 November 2008. Gąssowski said he was "almost 100 percent sure it is Copernicus". Forensic expert Capt. Dariusz Zajdel of the Polish Police Central Forensic Laboratory used the skull to reconstruct a face that closely resembled the features—including a broken nose and a scar above the left eye—on a Copernicus self-portrait. The expert also determined that the skull belonged to a man who had died around age 70—Copernicus' age at the time of his death.
The grave was in poor condition, and not all the remains of the skeleton were found; missing, among other things, was the lower jaw. The DNA from the bones found in the grave matched hair samples taken from a book owned by Copernicus which was kept at the library of the University of Uppsala in Sweden.
On 22 May 2010 Copernicus was given a second funeral in a Mass led by Józef Kowalczyk, the former papal nuncio to Poland and newly named Primate of Poland. Copernicus' remains were reburied in the same spot in Frombork Cathedral where part of his skull and other bones had been found. A black granite tombstone now identifies him as the founder of the heliocentric theory and also a church canon. The tombstone bears a representation of Copernicus' model of the solar system—a golden sun encircled by six of the planets.
Philolaus (c. 480–385 BCE) described an astronomical system in which a Central Fire (different from the Sun) occupied the centre of the universe, and a counter-Earth, the Earth, Moon, the Sun itself, planets, and stars all revolved around it, in that order outward from the centre. Heraclides Ponticus (387–312 BCE) proposed that the Earth rotates on its axis. Aristarchus of Samos (310 BCE – c. 230 BCE) identified the "central fire" with the Sun, around which he had the Earth orbiting. Some technical details of Copernicus's system closely resembled those developed earlier by the Islamic astronomers Naṣīr al-Dīn al-Ṭūsī and Ibn al-Shāṭir, both of whom retained a geocentric model. Aryabhata (476–550), in his magnum opus Aryabhatiya (499), propounded a planetary model in which the Earth was taken to be spinning on its axis and the periods of the planets were given with respect to the Sun. He accurately calculated many astronomical constants, such as the periods of the planets, times of the solar and lunar eclipses, and the instantaneous motion of the Moon.
At the Maragha observatory, Najm al-Dīn al-Qazwīnī al-Kātibī (d. 1277), in his Hikmat al-'Ain, wrote an argument for a heliocentric model, but later abandoned the model. Qutb al-Din Shirazi (b. 1236) also discussed the possibility of heliocentrism, but rejected it. Ibn al-Shatir (b. 1304) developed a geocentric system that employed mathematical techniques, such as the Tusi-couple and Urdi lemma, that were almost identical to those Nicolaus Copernicus later employed in his heliocentric system, implying that its mathematical model was influenced by the Maragha school.
Nilakantha Somayaji (1444–1544), in his Aryabhatiyabhasya, a commentary on Aryabhata's Aryabhatiya, developed a computational system for a partially heliocentric planetary model, in which the planets orbit the Sun, which in turn orbits the Earth, similar to the Tychonic system later proposed by Tycho Brahe in the late 16th century. In the Tantrasangraha (1500), he further revised his planetary system, which was mathematically more accurate at predicting the heliocentric orbits of the interior planets than both the Tychonic and Copernican models.
The prevailing theory in Europe during Copernicus' lifetime was the one that Ptolemy published in his Almagest circa 150 CE; the Earth was the stationary center of the universe. Stars were embedded in a large outer sphere which rotated rapidly, approximately daily, while each of the planets, the Sun, and the Moon were embedded in their own, smaller spheres. Ptolemy's system employed devices, including epicycles, deferents and equants, to account for observations that the paths of these bodies differed from simple, circular orbits centered on the Earth.
Copernicus' major theory was published in De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), in the year of his death, 1543, though he had formulated the theory several decades earlier.
Copernicus' "Commentariolus" summarized his heliocentric theory. It listed the "assumptions" upon which the theory was based as follows:
"1. There is no one center of all the celestial circles or spheres.
2. The center of the earth is not the center of the universe, but only of gravity and of the lunar sphere.
3. All the spheres revolve about the sun as their mid-point, and therefore the sun is the center of the universe.
4. The ratio of the earth's distance from the sun to the height of the firmament (outermost celestial sphere containing the stars) is so much smaller than the ratio of the earth's radius to its distance from the sun that the distance from the earth to the sun is imperceptible in comparison with the height of the firmament.
5. Whatever motion appears in the firmament arises not from any motion of the firmament, but from the earth's motion. The earth together with its circumjacent elements performs a complete rotation on its fixed poles in a daily motion, while the firmament and highest heaven abide unchanged.
6. What appear to us as motions of the sun arise not from its motion but from the motion of the earth and our sphere, with which we revolve about the sun like any other planet. The earth has, then, more than one motion.
7. The apparent retrograde and direct motion of the planets arises not from their motion but from the earth's. The motion of the earth alone, therefore, suffices to explain so many apparent inequalities in the heavens."
De revolutionibus itself was divided into six parts, called "books":
- General vision of the heliocentric theory, and a summarized exposition of his idea of the World
- Mainly theoretical, presents the principles of spherical astronomy and a list of stars (as a basis for the arguments developed in the subsequent books)
- Mainly dedicated to the apparent motions of the Sun and to related phenomena
- Description of the Moon and its orbital motions
- Exposition of the motions in longitude of the non-terrestrial planets
- Exposition of the motions in latitude of the non-terrestrial planets
Georg Joachim Rheticus could have been Copernicus' successor, but did not rise to the occasion. Erasmus Reinhold could have been his successor, but died prematurely. The first of the great successors was Tycho Brahe (though he did not think the earth orbited the sun), followed by Johannes Kepler, who had worked as Tycho's assistant in Prague.
Despite the near universal acceptance today of the basic heliocentric idea (though not the epicycles or the circular orbits), Copernicus' theory was originally slow to catch on. Scholars hold that sixty years after the publication of The Revolutions there were only around 15 astronomers espousing Copernicanism in all of Europe, "Thomas Digges and Thomas Hariot in England; Giordano Bruno and Galileo Galilei in Italy; Diego de Zuniga in Spain; Simon Stevin in the Low Countries; and in Germany, the largest group – Georg Joachim Rheticus, Michael Maestlin, Christoph Rothmann (who may have later recanted), and Johannes Kepler." Additional possibilities are Englishman William Gilbert, along with Achilles Gasser, Georg Vogelin, Valentin Otto, and Tiedemann Giese.
Arthur Koestler, in his popular book The Sleepwalkers, asserted that Copernicus' book had not been widely read on its first publication. This claim was trenchantly criticised by Edward Rosen, and has been decisively disproved by Owen Gingerich, who examined every surviving copy of the first two editions and found copious marginal notes by their owners throughout many of them. Gingerich published his conclusions in 2004 in The Book Nobody Read.
The intellectual climate of the time "remained dominated by Aristotelian philosophy and the corresponding Ptolemaic astronomy. At that time there was no reason to accept the Copernican theory, except for its mathematical simplicity [by avoiding using the equant in determining planetary positions]." Tycho Brahe's system ("that the earth is stationary, the sun revolves about the earth, and the other planets revolve about the sun") also directly competed with Copernicus'. It was only a half century later with the work of Kepler and Galileo that any substantial evidence defending Copernicanism appeared, starting "from the time when Galileo formulated the principle of inertia...[which] helped to explain why everything would not fall off the earth if it were in motion." It was not until "after Isaac Newton formulated the universal law of gravitation and the laws of mechanics [in his 1687 Principia], which unified terrestrial and celestial mechanics, was the heliocentric view generally accepted."
Only mild controversy (and no fierce sermons) was the immediate result of the publication of Copernicus' book. At the Council of Trent neither Copernicus' theory nor calendar reform (which would later use tables deduced from Copernicus' calculations) were discussed.
The first notable to move against Copernicanism was the Magister of the Holy Palace (i.e., the Catholic Church's chief censor), Dominican Bartolomeo Spina, who "expressed a desire to stamp out the Copernican doctrine". But with Spina's death in 1546, his cause fell to his friend, the well known theologian-astronomer, the Dominican Giovanni Maria Tolosani of the Convent of St. Mark in Florence. Tolosani had written a treatise on reforming the calendar (in which astronomy would play a large role), and had attended the Fifth Lateran Council to discuss the matter. He had obtained a copy of De Revolutionibus in 1544. His denouncement of Copernicanism appeared in an appendix to his work entitled On the Truth of Sacred Scripture.
Emulating the rationalistic style of Thomas Aquinas, Tolosani sought to refute Copernicanism on philosophical arguments. While still invoking Christian Scripture and Tradition, Tolosani strove to show Copernicanism was absurd because it was unproven and unfounded on three main points. First Copernicus had assumed the motion of the Earth but offered no physical theory whereby one would deduce this motion. (No one realized that the investigation into Copernicanism would result in a rethinking of the entire field of physics.) Second Tolosani charged that Copernicus' thought process was backwards. He held that Copernicus had come up with his idea and then sought phenomena that would support it, rather than observing phenomena and deducing from that the idea of what caused it. In this Tolosani was linking Copernicus' mathematical equations with the practices of the Pythagoreans (whom Aristotle had made arguments against, which were later picked up by Thomas Aquinas). It was argued that mathematical numbers were a mere product of the intellect without any physical reality, and as such "numbers could not provide physical causes in the investigation of nature." (This was basically a denial of the possibility of mathematical physics.)
Some astronomical hypotheses at the time (such as epicycles and eccentrics) were seen as mere mathematical devices to adjust calculations of where the heavenly bodies would appear, rather than an explanation of the cause of those motions. (As Copernicus still maintained the idea of perfectly spherical orbits he relied on epicycles). This "saving the phenomena" was seen as proof that Astronomy and Math could not be taken as a serious means to determine physical causes. Holding this view, Tolosani invoked it in his final critique of Copernicus, saying his biggest error was that he started with "inferior" fields of science to make pronouncements about "superior" fields. Copernicus had used Mathematics and Astronomy to postulate about Physics and Cosmology, rather than beginning with the accepted principles of Physics and Cosmology to determine things about Astronomy and Math. In this way Copernicus seemed to be undermining the whole system of the philosophy of science at the time. Tolosani held that Copernicus had just fallen into philosophical error because he hadn't been versed in physics and logic - anyone without such knowledge would make a poor astronomer and be unable to distinguish truth from falsehood. Because it had not meet the criteria for scientific truth set out by Thomas Aquinas, Tolosani held that Copernicanism could only be viewed as a wild unproven theory.
Tolosani recognized that the Ad Lectorem preface to Copernicus' book wasn't actually by him. Its thesis that astronomy as a whole would never be able to make truth claims was rejected by Tolosani, (though he still held that Copernicus' attempt to describe physical reality had been faulty), he found it ridiculous that Ad Lectorem had been included in the book (unaware that Copernicus hadn't authorized its inclusion). Tolosani wrote "By means of these words [of the Ad Lectorem], the foolishness of this book's author is rebuked. For by a foolish effort he [Copernicus] tried to revive the weak Pythagorean opinion [that the element of fire was at the center of the Universe], long ago deservedly destroyed, since it is expressly contrary to human reason and also opposes holy writ. From this situation, there could easily arise disagreements between Catholic expositors of holy scripture and those who might wish to adhere obstinately to this false opinion. We have written this little work for the purpose of avoiding this scandal." Tolosani declared "Nicolaus Copernicus neither read nor understood the arguments of Aristotle the philosopher and Ptolemy the astronomer." He wrote that Copernicus "is very deficient in the sciences of physics and logic. Moreover, it appears that he is unskilled with regard to [the interpretation of] holy scripture, since he contradicts several of its principles, not without danger of infidelity to himself and the readers of his book. ...his arguments have no force and can very easily be taken apart. For it is stupid to contradict an opinion accepted by everyone over a very long time for the strongest reasons, unless the impugner uses more powerful and insoluble demonstrations and completely dissolves the opposed reasons. But he does not do this in the least." He declared that he had written against Copernicus "for the purpose of preserving the truth to the common advantage of the Holy Church." Despite the efforts Tolosani put into his work it remained unpublished and it "was likely shelved in the library of the Dominican order at San Marco in Florence, awaiting its use by some new prosecutor" (it is believed that Dominican Tommaso Caccini read it before delivering a sermon against Galileo in December 1613).
It has been much debated why it was not until six decades after the publication of De revolutionibus that the Catholic Church took any official action against it, even the efforts of Tolosani had gone unheeded. Proposed reasons have included the personality of Galileo Galilei and the availability of evidence such as telescope observations.
How entwined the pre-Copernican theory was in theological circles can be seen in a sample of the works of John Calvin. In his Commentary on Genesis he said that "We indeed are not ignorant that the circuit of the heavens is finite, and that the earth, like a little globe, is placed in the centre." Commenting on Job 26:7 Calvin wrote "It is true that Job specifically says 'the north,' and yet he is speaking about the whole heaven. And that is because the sky turns around upon the pole that is there. For, just as in the wheels of a chariot there is an axle that runs through the middle of them, and the wheels turn around the axle by reason of the holes that are in the middle of them, even so is it in the skies. This is manifestly seen; that is to say, those who are well acquainted with the course of the firmament see that the sky so turns." Calvin's commentaries on the Psalms also show a reliance on the pre-Copernican theory; for Psalms 93:1 "The heavens revolve daily, and, immense as is their fabric and inconceivable the rapidity of their revolutions, we experience no concussion – no disturbance in the harmony of their motion. The sun, though varying its course every diurnal revolution, returns annually to the same point. The planets, in all their wanderings, maintain their respective positions. How could the earth hang suspended in the air were it not upheld by God's hand? By what means could it maintain itself unmoved, while the heavens above are in constant rapid motion, did not its Divine Maker fix and establish it." Commenting on Psalms 19:4 Calvin says "the firmament, by its own revolution draws with it all the fixed stars". There is no evidence that Calvin was aware of Copernicus, and claims that after quoting Psalm 93:1 he went on to say "Who will venture to place the authority of Copernicus above the Holy Spirit", have been discredited and shown to originate with Frederic William Farrar's Bampton Lecture in 1885. Unlike Calvin many theologians did become aware of Copernicus' theory which became increasingly controversial.
The sharpest point of conflict between Copernicus' theory and the Bible concerned the story of the Battle of Gibeon in the Book of Joshua where the Hebrew forces were winning but whose opponents were likely to escape once night fell. This is averted by Joshua's prayers causing the sun and the moon to stand still. Martin Luther once made a remark about Copernicus, although without mentioning his name. According to Anthony Lauterbach, while eating with Martin Luther the topic of Copernicus arose during dinner on 4 June 1539 (in the same year as professor George Joachim Rheticus of the local University had been granted leave to visit him). Luther is said to have remarked "So it goes now. Whoever wants to be clever must agree with nothing others esteem. He must do something of his own. This is what that fellow does who wishes to turn the whole of astronomy upside down. Even in these things that are thrown into disorder I believe the Holy Scriptures, for Joshua commanded the sun to stand still and not the earth." These remarks were made four years before the publication of On the Revolutions of the Heavenly Spheres and a year before Rheticus' Narratio Prima. In John Aurifaber's account of the conversation Luther calls Copernicus "that fool" rather than "that fellow", this version is viewed by historians as less reliably sourced.
Luther's collaborator Philipp Melanchthon also took issue with Copernicanism. After receiving the first pages of Narratio Prima from Rheticus himself, Melanchthon wrote to Mithobius (physician and mathematician Burkard Mithob of Feldkirch) on October 16, 1541 condemning the theory and calling for it to be repressed by governmental force, writing "certain people believe it is a marvelous achievement to extol so crazy a thing, like that Polish astronomer who makes the earth move and the sun stand still. Really, wise governments ought to repress impudence of mind." It had appeared to Rheticus that Melanchton would understand the theory and would be open to it. This was because Melanchton had taught Ptolemaic astronomy and had even recommended his friend Rheticus to an appointment to the Deanship of the Faculty of Arts & Sciences at the University of Wittenberg after he had returned from studying with Copernicus.
Rheticus' hopes were dashed when six years after the publication of De Revolutionibus Melanchthon published his Initia Doctrinae Physicae presenting three grounds to reject Copernicanism, these were "the evidence of the senses, the thousand-year consensus of men of science, and the authority of the Bible". Blasting the new theory Melanchthon wrote "Out of love for novelty or in order to make a show of their cleverness, some people have argued that the earth moves. They maintain that neither the eighth sphere nor the sun moves, whereas they attribute motion to the other celestial spheres, and also place the earth among the heavenly bodies. Nor were these jokes invented recently. There is still extant Archimedes' book on The sand-reckoner; in which he reports that Aristarchus of Samos propounded the paradox that the sun stands still and the earth revolves around the sun. Even though subtle experts institute many investigations for the sake of exercising their ingenuity, nevertheless public proclamation of absurd opinions is indecent and sets a harmful example." Melanchthon went on to cite Bible passages and then declare "Encouraged by this divine evidence, let us cherish the truth and let us not permit ourselves to be alienated from it by the tricks of those who deem it an intellectual honor to introduce confusion into the arts." In the first edition of Initia Doctrinae Physicae, Melanchthon even questioned Copernicus' character claiming his motivation was "either from love of novelty or from desire to appear clever", these more personal attacks were largely removed by the second edition in 1550.
Another Protestant theologian who took issue with Copernicus was John Owen who declared that "the late hypothesis, fixing the sun as in the centre of the world' was 'built on fallible phenomena, and advanced by many arbitrary presumptions against evident testimonies of Scripture.'
In Roman Catholic circles, German Jesuit Nicolaus Serarius was one of the first to write against Copernicus' theory as heretical, citing the Joshua passage, in a work published in 1609–1610, and again in a book in 1612.
In his 12 April 1615 letter to a Catholic defender of Copernicus, Paolo Antonio Foscarini, Catholic Cardinal Robert Bellarmine condemned Copernican theory, writing "...not only the Holy Fathers, but also the modern commentaries on Genesis, the Psalms, Ecclesiastes, and Joshua, you will find all agreeing in the literal interpretation that the sun is in heaven and turns around the earth with great speed, and that the earth is very far from heaven and sits motionless at the center of the world...Nor can one answer that this is not a matter of faith, since if it is not a matter of faith 'as regards the topic,' it is a matter of faith 'as regards the speaker': and so it would be heretical to say that Abraham did not have two children and Jacob twelve, as well as to say that Christ was not born of a virgin, because both are said by the Holy Spirit through the mouth of prophets and apostles."
Perhaps the strongest opponent to Copernican theory was Francesco Ingoli, a Catholic priest. Ingoli wrote a January 1616 essay condemning Copernicanism as "philosophically untenable and theologically heretical." Though "it is not certain, it is probable that he was commissioned by the Inquisition to write an expert opinion on the controversy", (after the Congregation of the Index's decree against Copernicanism on 5 March 1616 Ingoli was officially appointed its consultant). Two of Ingoli's theological issues with Copernicus' theory were "common Catholic beliefs not directly traceable to Scripture: the doctrine that hell is located at the center of Earth and is most distant from heaven; and the explicit assertion that Earth is motionless in a hymn sung on Tuesdays as part of the Liturgy of the Hours of the Divine Office prayers regularly recited by priests." Ingoli also cited Genesis 1:14 where YHWH places "lights in the firmament of the heavens to divide the day from the night." Like previous commentators Ingoli pointed to the passages about the Battle of Gibeon and dismissed arguments that they should be taken metaphorically, saying "Replies which assert that Scripture speaks according to our mode of understanding are not satisfactory: both because in explaining the Sacred Writings the rule is always to preserve the literal sense, when it is possible, as it is in this case; and also because all the [Church] Fathers unanimously take this passage to mean that the sun which was truly moving stopped at Joshua's request. An interpretation which is contrary to the unanimous consent of the Fathers is condemned by the Council of Trent, Session IV, in the decree on the edition and use of the Sacred Books. Furthermore, although the Council speaks about matters of faith and morals, nevertheless it cannot be denied that the Holy Fathers would be displeased with an interpretation of Sacred Scriptures which is contrary to their common agreement."
In March 1616, in connection with the Galileo affair, the Roman Catholic Church's Congregation of the Index issued a decree suspending De revolutionibus until it could be "corrected", on the grounds that the supposedly Pythagorean doctrine that the Earth moves and the Sun does not was "false and altogether opposed to Holy Scripture". The same decree also prohibited any work that defended the mobility of the Earth or the immobility of the Sun, or that attempted to reconcile these assertions with Scripture.
On the orders of Pope Paul V, Cardinal Robert Bellarmine gave Galileo prior notice that the decree was about to be issued, and warned him that he could not "hold or defend" the Copernican doctrine. The corrections to De revolutionibus, which omitted or altered nine sentences, were issued four years later, in 1620.
In 1633 Galileo Galilei was convicted of grave suspicion of heresy for "following the position of Copernicus, which is contrary to the true sense and authority of Holy Scripture", and was placed under house arrest for the rest of his life.
At the instance of Roger Boscovich, the Catholic Church's 1758 Index of Prohibited Books omitted the general prohibition of works defending heliocentrism, but retained the specific prohibitions of the original uncensored versions of De revolutionibus and Galileo's Dialogue Concerning the Two Chief World Systems. Those prohibitions were finally dropped from the 1835 Index.
||The neutrality of this section is disputed. (February 2013)|
There has been discussion of Copernicus' nationality and of whether, in fact, it is meaningful to ascribe to him a nationality in the modern sense.
Polish astronomer Konrad Rudnicki calls the discussion a "fierce scholarly quarrel in... times of nationalism" and describes Copernicus as an inhabitant of a German-speaking territory that belonged to Poland, himself being of mixed Polish-German extraction.
According to Czesław Miłosz, the debate is an "absurd" projection of a modern understanding of nationality onto Renaissance people, who identified with their home territories rather than with a nation.
Miłosz and Davies both write that Copernicus had a German-language cultural background, while his working language was Latin in accord with the usage of the time. Additionally, according to Davies, "there is ample evidence that he knew the Polish language". Davies concludes: "Taking everything into consideration, there is good reason to regard him both as a German and as a Pole: and yet, in the sense that modern nationalists understand it, he was neither."
The Stanford Encyclopedia of Philosophy describes Copernicus as a "child of a German family [who] was a subject of the Polish crown", while Martin Weissenbacher writes that Copernicus' father was a Germanized Pole. Encyclopædia Britannica, Encyclopedia Americana, The Columbia Encyclopedia The Oxford World Encyclopedia, and World Book Encyclopedia refer to Copernicus as a "Polish astronomer".
On 14 July 2009, the discoverers, from the Gesellschaft für Schwerionenforschung in Darmstadt, Germany, of chemical element 112 (temporarily named ununbium) proposed to the International Union of Pure and Applied Chemistry that its permanent name be "copernicium" (symbol Cn). "After we had named elements after our city and our state, we wanted to make a statement with a name that was known to everyone," said Hofmann. "We didn't want to select someone who was a German. We were looking world-wide." On the 537th anniversary of his birthday the official naming was released to the public.
- Copernican principle
- Monetae cudendae ratio
- List of Roman Catholic scientist-clerics
- Nicolaus Copernicus Monument in Toruń
- Nicolaus Copernicus Monument in Kraków
- Nicolaus Copernicus Monument in Warsaw
- Linton (2004, pp. 39, 119). Copernicus was not the first to propose a heliocentric system. A Greek mathematician and astronomer, Aristarchus of Samos, had done so as early as the third century BCE; but there is little evidence that Aristarchus developed his ideas beyond a very basic outline (Dreyer, 1953, pp. 135–48).
- Nicolaus Copernicus, memorandum on monetary policy, 1517.
- "Copernicus seems to have drawn up some notes [on the displacement of good coin from circulation by debased coin] while he was at Olsztyn in 1519. He made them the basis of a report on the matter, written in German, which he presented to the Prussian Diet held in 1522 at Grudziądz... He later drew up a revised and enlarged version of his little treatise, this time in Latin, and setting forth a general theory of money, for presentation to the Diet of 1528." Angus Armitage, The World of Copernicus, 1951, p. 91.
- Iłowiecki, Maciej (1981). Dzieje nauki polskiej. Warszawa: Wydawnictwo Interpress. p. 40. ISBN 83-223-1876-6.
- "Nicolaus Copernicus". Stanford Encyclopedia of Philosophy. Retrieved 2007-04-22.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, vol. XIV, 1969, p. 4.
- [Great Books of the Western World, Book 16]
- "The name of the village, not unlike that of the astronomer's family, has been variously spelled. A large German atlas of Silesia, published by Wieland in Nuremberg in 1731, spells it Kopernik." Stephen Mizwa, Nicolaus Copernicus, 1543–1943, Kessinger Publishing, 1943, p. 36. ()
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, vol. XIV, 1969, p. 3.
- Barbara Bieńkowska, The Scientific World of Copernicus, Springer, 1973 
- Eugeniusz Rybka for Polska Akademia Nauk (the Polish Academy of Sciences), The Review of the Polish Academy of Sciences: Nicolaus Copernicus' Relationship with Cracow, Ossolineum, 1973, p. 23. 
- Josh Sakolsky, Copernicus and Modern Astronomy, Rosen Publishing Group, 2005, p. 8. 
- Marian Biskup, Regesta Copernicana (calendar of Copernicus' papers), Ossolineum, 1973, p. 16. 
- "The mother of Barbara and Lucas was a Modlibog." Alexandre Koyre, Astronomical Revolution: Copernicus – Kepler – Borelli, Cornell University Press, 1973, ISBN 0-486-27095-5, p. 78. ()
- "Adrian Krzyzanowski and John Sniadecki: Copernicus and His Native Land", The Foreign and Colonial Quarterly Review, Smith, Elder & Co., 1844, p. 367. ()
- Stephen Mizwa: Nicolaus Copernicus, 1543–1943. Kessinger Publishing, 1943, p. 38.
- Czesław Miłosz, The History of Polish Literature, University of California Press, 1983, p. 38. 
- Dobrzycki and Hajdukiewicz, Polski słownik biograficzny, vol. XIV, 1969, p. 4.
- The Head Office of State Archives, Poland, "Copernicus' Biography", accessed 2009-05-22, 
- Jeremi Wasiutyński, The Solar Mystery: An Inquiry Into the Temporal and the Eternal Background of the Rise of Modern Civilization, Solum Forlag, 2003, p. 29. 
- "In 1512, Bishop Watzenrode died suddenly after attending King Sigismund's wedding feast in Kraków. Rumors abounded that the bishop had been poisoned by agents of his long-time foe, the Teutonic Knights." Alan Hirshfeld: Parallax: The race to Measure the Cosmos. W.H. Freemand and Company, 2001, ISBN 0-7167-3711-6, p. 38. ()
- "The Watzelrodes—or Watzenrodes—in spite of their rather Germanic name seemed to have been good Poles (enemies of the Teutonic Order)." Alexandre Koyre, Astronomical Revolution, Copernicus – Kepler – Borelli, New York, Cornell University Press, 1973, ISBN 0-486-27095-5, p. 38. ()
- "[Watzenrode] was also firm, and the Teutonic Knights, who remained a constant menace, did not like him at all; the Grand Master of the order once described him as 'the devil incarnate'. [Watzenrode] was the trusted friend and advisor of three kings in succession: John Albert, Alexander (not to be confused with the poisoning pope), and Sigismund; and his influence greatly strengthened the ties between Warmia and Poland proper." Patrick Moore: The Great Astronomical Revolution: 1534–1687 and the Space Age Epilogue. Albion Publishing, 1994, ISBN 1-898563-18-7, pp. 52, 62 ().
- Wojciech Iwanczak (1998). "WATZENRODE, Lucas". In Bautz, Traugott. Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German) 13. Herzberg: Bautz. col. 389–393. ISBN 3-88309-072-7.
- "Lucas was on more friendly terms with his successors, Johann Albert (Jan Olbracht) (from 1492 to 1501), and later Alexander (Aleksander) (from 1501 to 1506), and Sigismund (Zygmunt) I (from 1506)." Pierre Gassendi & Olivier Thill: The Life of Copernicus (1473–1543): The Man Who Did Not Change the World. Xulon Press, 2002, ISBN 1-59160-193-2, p. 22. ()
- "[Watzenrode] was also firm, and the Teutonic Knights, who remained a constant menace, did not like him at all; the Grand Master of the order once described him as 'the devil incarnate'. [Watzenrode] was the trusted friend and advisor of three kings in succession: John Albert, Alexander (not to be confused with the poisoning pope), and Sigismund; and his influence greatly strengthened the ties between Warmia and Poland proper." Patrick Moore: The Great Astronomical Revolution: 1534–1687 and the Space Age Epilogue. Albion Publishing, 1994, ISBN 1-898563-18-7, pp. 52, 62. ()
- "He spoke German, Polish and Latin with equal fluency as well as Italian." Daniel Stone: The Polish-Lithuanian State, 1386–1795. University of Washington Press, 2001, ISBN 0-295-98093-1, p. 101. ()
- "He spoke Polish, Latin and Greek." Barbara Somerville: Nicolaus Copernicus: Father of Modern Astronomy. Compass Point Books, 2005, ISBN 0-7565-0812-6, p. 10. ().
- "He was a linguist with a command of Polish, German and Latin, and he possessed also a knowledge of Greek rare at that period in northeastern Europe and probably had some acquaintance with Italian and Hebrew." Angus Armitage: Copernicus and Modern Astronomy. Dover Publications, 2004 (originally 1957), ISBN 0-486-43907-0, p. 62.
- He used Latin and German, knew enough Greek to translate the 7th-century Byzantine poet Theophylact Simocatta's verses into Latin prose (Armitage, The World of Copernicus, pp. 75–77), and "there is ample evidence that he knew the Polish language" (Norman Davies, God's Playground, vol. II, p. 26). During his several years' studies in Italy, Copernicus presumably would also have learned some Italian. Professor Stefan Melkowski of Nicolaus Copernicus University in Toruń likewise asserts that Copernicus spoke both German and Polish. ( "O historii i o współczesności" ("About History and Contemporaneity"), May 2003.])
- "Deutsch war für Kopernikus Muttersprache und Alltagssprache, wenn auch der schriftliche Umgang fast ausschließlich auf Lateinisch erfolgte." Martin Carrier: Nikolaus Kopernikus. Beck'sche Reihe, C. H. Beck, 2001, ISBN 3-406-47577-9, ISBN 978-3-406-47577-1, p. 192. (online)])
- Rosen (1995, p. 127).
- "Although great importance has frequently been ascribed to this fact, it does not imply that Copernicus considered himself to be a German. The 'nationes' of a medieval university had nothing in common with nations in the modern sense of the word. Students who were natives of Prussia and Silesia were automatically described as belonging to the Natio Germanorum. Furthmore, at Bologna, this was the 'privileged' nation; consequently, Copernicus had very good reason for inscribing himself on its register." Alexandre Koyre: Astronomical Revolution, Copernicus – Kepler – Borelli. Cornell University Press, 1973, ISBN 0-486-27095-5, p. 21. ()
- "It is important to recognize, however, that the medievel Latin concept of natio, or "nation", referred to the community of feudal lords both in Germany and elsewhere, not to 'the people' in the nineteenth-century democratic or nationalistic sense of the word." Lonnie Johnson, Central Europe: Enemies, Neighbors, Friends, Oxford University Press, 1996, ISBN 0-19-510071-9, p. 23. ()
- Arthur Koestler, The Sleepwalkers, 1968, p. 129.
- Pierre Gassendi, Oliver Thill, The Life of Copernicus (1473–1543), 2002, p. 37.
- Nicolaus Copernicus et al., Nicolaus Copernicus Gesamtausgabe. Documenta Copernicana I.: Briefe, Texte und Übersetzungen, 1996, p. 39.
- Melkowski, Stefan (May 2003). "O historii i o współczesności (On History and the Present Day)" (in Polish). Retrieved 2007-04-22.
- "Kopernik, Koperek, Kopr and Koprnik in Polish—also similarly in other Slavonic languages—means simply dill such as is used in dill pickling. Be it as it may, although the present writer is more inclined towards the occupational interpretation, it is interesting to note ..." Stephen Mizwa, Nicolaus Copernicus, 1543–1943, Kessinger Publishing, 1943, p. 37.
- Armitage, p. 51.
- Gingerich (2004), p. 143.
- Nicolaus Copernicus Gesamtausgabe: Urkunden, Akten und Nachrichten: Texte und Übersetzungen, p. 23 ff. ISBN 3-05-003009-7.
- Marian Biskup, Regesta Copernicana (Calendar of Copernicus' Papers), Ossolineum, 1973, page 32.
- Biskup (1973), pp. 38, 82.
- Carlo Malagola, Della vita e delle opere di Antonio Urceo detto Codro: studi e ricerche, 1878, pp. 562–65.
- "Copernicus, Nicolaus". Encyclopædia Britannica Online. Encyclopædia Britannica. 2009. Retrieved 2009-11-21.
- Maximilian Curtze, Ueber die Orthographie des Namens Coppernicus, 1879, .
- Czesław Miłosz, The History of Polish Literature, p. 38.
- Angus Armitage, The World of Copernicus, p. 55.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, pp. 4–5.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, p. 5.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, pp. 5–6.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, p. 6.
- Rabin (2005).
- Gingerich (2004, pp. 187–89, 201); Koyré (1973, p. 94); Kuhn (1957, p. 93); Rosen (2004, p. 123); Rabin (2005). Robbins (1964, p.x), however, includes Copernicus among a list of Renaissance astronomers who "either practiced astrology themselves or countenanced its practice".
- Sedlar (1994).
- Angus Armitage, The World of Copernicus, pp. 75–77.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, p. 7.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, pp. 7–8.
- Repcheck (2007), p. 66.
- Copernicus, Nicolaus, Minor Works (Edward Rosen, translator), Baltimore: Johns Hopkins University Press, 1992, pp. 176–215.
- Oliver Volckart, "Early Beginnings of the Quantity Theory of Money and Their Context in Polish and Prussian Monetary Policies, c. 1520–1550", The Economic History Review, New Series 50 (August 1997) 3, pp. 430–49.
- Repcheck, Jack (2007). Copernicus' Secret. New York, NY: Simon & Schuster. pp. 79, 78, 184, 186. ISBN 978-0-7432-8951-1.
- Jerzy Dobrzycki and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny, vol. XIV, 1969, p. 11.
- Angus Armitage, The World of Copernicus, pp. 97–98.
- Angus Armitage, The World of Copernicus, p. 98.
- Kuhn, 1957, pp. 187–88.
- Photograph of a portrait of Copernicus by an unknown painter. The original was looted—possibly destroyed—by the Germans in World War II. Jan Świeczyński, Katalog skradzionych i zaginionych dóbr kultury (Catalog of Stolen and Missing Cultural Property), Warsaw, Ośrodek Informacyjno-Koordynacyjny Ochrony Obiektów Muzealnych (Center of Information and Coordination for the Safeguarding of Museum Objects), 1988.
- A reference to the "Commentariolus" is contained in a library catalogue, dated 1 May 1514, of a 16th-century historian, Matthew of Miechów, so it must have begun circulating before that date (Koyré, 1973, p.85; Gingerich, 2004, p.32). Thoren (1990, p.99[dead link]) gives the length of the manuscript as 40 pages.
- Goddu (2010: 245–6)
- Schönberg, Nicholas, Letter to Nicolaus Copernicus, translated by Edward Rosen.
- Koyré (1973, pp. 27, 90) and Rosen (1995, pp. 64,184) take the view that Copernicus was indeed concerned about possible objections from theologians, while Lindberg and Numbers (1986) argue against it. Koestler (1963) also denies it. Indirect evidence that Copernicus was concerned about objections from theologians comes from a letter written to him by Andreas Osiander in 1541, in which Osiander advises Copernicus to adopt a proposal by which he says "you will be able to appease the Peripatetics and theologians whose opposition you fear". (Koyré, 1973, pp. 35, 90)
- Dreyer (1953, p.319).
- Easton, Adam (21 November 2008). "Polish tests 'confirm Copernicus'". BBC News. Retrieved 2010-01-18.
- "Copernicus' grave found in Polish church". USA Today. 3 November 2005. Retrieved 2012-07-26.
- Bowcott, Owen (21 November 2008). "16th-century skeleton identified as astronomer Copernicus" The Guardian. Retrieved 2010-01-18.
- Bogdanowicz, W.; Allen, M.; Branicki, W.; et al., M.; Gajewska, M.; Kupiec, T. (2009). "Genetic identification of putative remains of the famous astronomer Nicolaus Copernicus". PNAS 106 (30): 12279–12282. Bibcode:2009PNAS..10612279B. doi:10.1073/pnas.0901848106. PMC 2718376. PMID 19584252.
- Gingerich, O. (2009). "The Copernicus grave mystery". PNAS 106 (30): 12215–12216. Bibcode:2009PNAS..10612215G. doi:10.1073/pnas.0907491106. PMC 2718392. PMID 19622737.
- Astronomer Copernicus Reburied as Hero (New York Times, 22 May 2010)
- Dreyer (1953), pp. 40–52); Linton (2004, p. 20).
- Dreyer (1953), pp. 123–35); Linton (2004, p. 24).
- Dreyer (1953, pp.135–48); Heath (1913), pp.301–8)
- Particularly his use of the Tusi couple and his models for the motions of Mercury and the Moon (Linton 2004, pp.124,137–38).
- Rosen (2004), pp. 58–59).
- Danielson (2006).
- Koestler (1959, p.191)
- Rosen (1995, pp.187–192), originally published in 1967 in Saggi su Galileo Galilei . Rosen is particularly scathing about this and other statements in The Sleepwalkers which he criticises as inaccurate.
- Gingerich (2004), DeMarco (2004) 
- Copernicus and Martin Luther: An Encounter Between Science and Religion by Donald H. Kobe, American Journal of Physics, March 1998, Volume 66, Issue 3, pp. 190
- Rivka Feldhay (1995). Galileo and the Church. Cambridge University Press.
- Rosen (1995, p.158)
- Rosen (1995, pp.151–59)
- Robert S. Westman (2011). The Copernican Question: Prognostication, Skepticism, and Celestial Order. Los Angeles, CA: University of California Press.
- Calvin's Attitude Toward Copernicus by Edward Rosen, Journal of the History of Ideas, Vol. 21, No. 3 (Jul. – Sep., 1960), pp. 431–441 Published by: University of Pennsylvania Press
- Edward Rosen (2003). Copernicus and his successors. Hambledon Continuum.
- I. Bernard Cohen (1985). Harvard College Press. Text "Revolution in Science" ignored (help); Missing or empty
- Exercitations concerning the Name, Original, Nature, Use, and Continuance of a Day of Sacred Rest, Exercitation II = An Exposition of the Epistle to the Hebrews, Exercitation XXXVI, section 16 (Works, London, 1850–1855; re-issued, Edinburgh, 1862, XIX, 310).
- Maurice A. Finocchiaro (2010). Defending Copernicus and Galileo: Critical Reasoning in the Two Affairs. Springer Science & Business Media.
- In fact, in the Pythagorean cosmological system the Sun was not motionless.
- Decree of the General Congregation of the Index, 5 March 1616, translated from the Latin by Finocchiaro (1989, pp.148–149). An on-line copy of Finocchiaro's translation has been made available by Gagné (2005).
- Fantoli (2005, pp.118–19); Finocchiaro (1989, pp.148, 153). On-line copies of Finocchiaro's translations of the relevant documents, Inquisition Minutes of 25 February 1616 and Cardinal Bellarmine's certificate of 26 May 1616, have been made available by Gagné (2005). This notice of the decree would not have prevented Galileo from discussing heliocentrism solely as a mathematical hypothesis, but a stronger formal injunction (Finocchiaro, 1989, p.147-148) not to teach it "in any way whatever, either orally or in writing", allegedly issued to him by the Commissary of the Holy Office, Father Michelangelo Segizzi, would certainly have done so (Fantoli, 2005, pp.119–20, 137). There has been much controversy over whether the copy of this injunction in the Vatican archives is authentic; if so, whether it was ever issued; and if so, whether it was legally valid (Fantoli, 2005, pp.120–43).
- Catholic Encyclopedia.
- From the Inquisition's sentence of 22 June 1633 (de Santillana, 1976, pp.306–10; Finocchiaro 1989, pp. 287–91)
- Heilbron (2005, p. 307); Coyne (2005, p. 347).
- McMullin (2005, p. 6); Coyne (2005, pp. 346–47).
- Burleigh, Michael (1988). Germany turns eastwards. A study of Ostforschung in the Third Reich. CUP Archive. pp. 60, 133, 280. ISBN 0-521-35120-0.
- Rudnicki, Konrad (November–December 2006). "The Genuine Copernican Cosmological Principle". Southern Cross Review: note 2. Retrieved 2010-01-21.
- Miłosz, Czesław (1983). The history of Polish literature (2 ed.). University of California Press. p. 37. ISBN 0-520-04477-0.
- Davies, Norman (2005). God's playground. A History of Poland in Two Volumes II. Oxford University Press. p. 20. ISBN 0-19-925340-4.
- Manfred Weissenbacher, Sources of Power: How Energy Forges Human History, Praeger, 2009, p. 170.
- "Copernicus, Nicolaus". Encyclopædia Britannica Online. Encyclopædia Britannica. 2007. Retrieved 2007-09-21.
- "Copernicus, Nicolaus", Encyclopedia Americana, 1986, vol. 7, pp. 755–56.
- "Nicholas Copernicus", The Columbia Encyclopedia, sixth edition, 2008. Encyclopedia.com. 18 July 2009.
- "Copernicus, Nicolaus", The Oxford World Encyclopedia, Oxford University Press, 1998.
- Fox, Stuart (2009-07-14). "14 July 2009 – Element 112 shall be named "copernicium", http". //www.popsci.com/. Retrieved 2012-08-17.
- Renner, Terrence (20 February 2010). "Element 112 is Named Copernicium". International Union of Pure and Applied Chemistry. Retrieved 2010-02-20.[dead link]
- "Calendar of the Church Year according to the Episcopal Church". Satucket.com. 2010-06-12. Retrieved 2012-08-17.
- Armitage, Angus (1951). The World of Copernicus. New York, NY: Mentor Books.
- Barbara Bieńkowska (1973). The Scientific World of Copernicus: On the Occasion of the 500th Anniversary of His Birth, 1473–1973. Springer. ISBN 90-277-0353-1.
- Coyne, George V., S.J. (2005). The Church's Most Recent Attempt to Dispel the Galileo Myth. In McMullin (2005, pp.340–59).
- Danielson, Dennis Richard (2006). The First Copernican: Georg Joachim Rheticus and the Rise of the Copernican Revolution. New York: Walker & Company. ISBN 0-8027-1530-3.
- Davies, Norman, God's Playground: A History of Poland, 2 vols., New York, Columbia University Press, 1982, ISBN 0-231-04327-9.
- DeMarco, Peter (13 April 2004). "Book quest took him around the globe". Boston Globe. Retrieved 2008-01-14.
- Dobrzycki, Jerzy, and Leszek Hajdukiewicz, "Kopernik, Mikołaj", Polski słownik biograficzny (Polish Biographical Dictionary), vol. XIV, Wrocław, Polish Academy of Sciences, 1969, pp. 3–16.
- Dreyer, John Louis Emil (1953) . A History of Astronomy from Thales to Kepler. New York, NY: Dover Publications.
- Fantoli, Annibale (2005). The Disputed Injunction and its Role in Galileo's Trial. In McMullin (2005, pp.117–49).
- Finocchiaro, Maurice A. (1989). The Galileo Affair: A Documentary History. Berkeley, CA: University of California Press. ISBN 0-520-06662-6.
- Gagné, Marc (2005). "Texts from The Galileo Affair: A Documentary History edited and translated by Maurice A. Finocchiaro". West Chester University course ESS 362/562 in History of Astronomy. Archived from the original on 2007-09-30. Retrieved 2008-01-15. (Extracts from Finocchiaro (1989))
- Gingerich, Owen (2004). The Book Nobody Read. London: William Heinemann. ISBN 0-434-01315-3.
- Goddu, André (2010). Copernicus and the Aristotelian tradition. Leiden, Netherlands: Brill. ISBN 978-90-04-18107-6.
- Goodman, David C.; Russell, Colin A. (1991). The Rise of Scientific Europe, 1500–1800. Hodder Arnold H&S. ISBN 0-340-55861-X.
- Heath, Sir Thomas (1913). Aristarchus of Samos, the ancient Copernicus ; a history of Greek astronomy to Aristarchus, together with Aristarchus's Treatise on the sizes and distances of the sun and moon : a new Greek text with translation and notes. London: Oxford University Press.
- Heilbron, John L. (2005). Censorship of Astronomy in Italy after Galileo. In McMullin (2005, pp.279–322).
- Hoskin, Michael A., The Cambridge Concise History of Astronomy, Cambridge, England, Cambridge University Press, ISBN 0-521-57600-8.
- Koestler, Arthur (1963) . The Sleepwalkers: A History of Man's Changing Vision of the Universe. New York, NY: Grosset & Dunlap. ISBN 0-448-00159-4. Original edition published by Hutchinson (1959, London)
- Koeppen, Hans et al. (1973). Nicolaus Copernicus zum 500. Geburtstag. Böhlau Verlag. ISBN 3-412-83573-0.
- Koyré, Alexandre (1973). The Astronomical Revolution: Copernicus – Kepler – Borelli. Ithaca, NY: Cornell University Press. ISBN 0-8014-0504-1.
- Kuhn, Thomas (1957). The Copernican Revolution: Planetary Astronomy in the Development of Western Thought. Cambridge, MA: Harvard University Press. OCLC 535467.
- Lindberg, David C.; Numbers, Ronald L. (1986). "Beyond War and Peace: A Reappraisal of the Encounter between Christianity and Science". Church History (Cambridge University Press) 55 (3): 338–354. doi:10.2307/3166822. JSTOR 3166822.
- Linton, Christopher M. (2004). From Eudoxus to Einstein—A History of Mathematical Astronomy. Cambridge: Cambridge University Press. ISBN 978-0-521-82750-8.
- Manetho; Ptolemy (1964) . Manetho Ptolemy Tetrabiblos. Loeb Classical Library edition, translated by W.G.Waddell and F.E.Robbins PhD. London: William Heinemann.
- McMullin, Ernan, ed. (2005). The Church and Galileo. Notre Dame, IN: University of Notre Dame Press. ISBN 0-268-03483-4.
- Miłosz, Czesław, The History of Polish Literature, second edition, Berkeley, University of California Press, 1969, ISBN 0-520-04477-0.
- Ptolemy, Claudius (1964) . Tetrabiblos. Loeb Classical Library edition, translated by F.E.Robbins PhD. London: William Heinemann.
- Rabin, Sheila (2005). "Copernicus". The Stanford Encyclopedia of Philosophy (Summer 2005 Edition), Edward N. Zalta (ed.). Retrieved 2008-05-26.
- Repcheck, Jack (2007). Copernicus' Secret: How the Scientific Revolution Began. New York: Simon & Schuster. ISBN 0-7432-8951-X.
- Rosen, Edward (1995). Copernicus and his Successors. London: Hambledon Press. ISBN 1-85285-071-X.
- Rosen, Edward (translator) (2004) . Three Copernican Treatises:The Commentariolus of Copernicus; The Letter against Werner; The Narratio Prima of Rheticus (Second Edition, revised ed.). New York, NY: Dover Publications. ISBN 0-486-43605-5.
- Russell, Jeffrey Burton (1997) . Inventing the Flat Earth—Columbus and Modern Historians. New York, NY: Praeger. ISBN 0-275-95904-X.
- de Santillana, Giorgio (1976—Midway reprint) . The Crime of Galileo. Chicago, Ill: University of Chicago Press. ISBN 0-226-73481-1.
- Sedlar, Jean W. (1994). East Central Europe in the Middle Ages 1000–1500. University of Washington Press. ISBN 0-295-97290-4.
- Thoren, Victor E. (1990). The Lord of Uraniborg. Cambridge: Cambridge University Press. ISBN 0-521-35158-8. (A biography of Danish astronomer and alchemist Tycho Brahe.)
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- Primary Sources
- Works by Nicolaus Copernicus at Project Gutenberg
- De Revolutionibus, autograph manuscript – Full digital facsimile, Jagiellonian University
- (Polish) Polish translations of letters written by Copernicus in Latin or German
- Online Galleries, History of Science Collections, University of Oklahoma Libraries High resolution images of works by and/or portraits of Nicolaus Copernicus in .jpg and .tiff format.
- O'Connor, John J.; Robertson, Edmund F., "Nicolaus Copernicus", MacTutor History of Mathematics archive, University of St Andrews.
- Copernicus in Torun
- Nicolaus Copernicus Thorunensis by the Copernican Academic Portal
- Nicolaus Copernicus Museum in Frombork
- Portraits of Copernicus: Copernicus's face reconstructed; Portrait; Nicolaus Copernicus
- Copernicus and Astrology – Cambridge University: Copernicus had – of course – teachers with astrological activities and his tables were later used by astrologers.
- Stanford Encyclopedia of Philosophy entry
- 'Body of Copernicus' identified – BBC article including image of Copernicus using facial reconstruction based on located skull
- Nicolaus Copernicus on the 1000 Polish Zloty banknote.
- Copernicus's model for Mars 
- Retrograde Motion 
- Copernicus's explanation for retrograde motion 
- Geometry of Maximum Elongation 
- Copernican Model 
- Portraits of Nicolaus Copernicus
- About De Revolutionibus
- The Copernican Universe from the De Revolutionibus
- De Revolutionibus, 1543 first edition – Full digital facsimile, Lehigh University
- The text of the De Revolutionibus
- (Italian) Copernicus in Bologna – in Italian
- Article which discusses Copernicus's debt to the Arabic tradition
- Nicolaus Copernicus Prize, founded by the City of Kraków, awarded since 1995
- German-Polish cooperation
- (English) (German) (Polish) German-Polish "Copernicus Prize" awarded to German and Polish scientists (DFG website)
- (English) (German) (Polish) Büro Kopernikus – An initiative of German Federal Cultural Foundation
- (German) (Polish) German-Polish school project on Copernicus