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Ibn al-Haytham, in his ''[[Book of Optics]]'' (1021), was also the first to discover that the [[celestial spheres]] do not consist of [[solid]] matter, and he also discovered that the heavens are less dense than the air. These views were later repeated by [[Witelo]] and had a significant influence on the [[Copernican heliocentrism|Copernican]] and [[Tychonic system]]s of astronomy.<ref>{{Harv|Rosen|1985|pp=19-20 & 21}}</ref>
Ibn al-Haytham, in his ''[[Book of Optics]]'' (1021), was also the first to discover that the [[celestial spheres]] do not consist of [[solid]] matter, and he also discovered that the heavens are less dense than the air. These views were later repeated by [[Witelo]] and had a significant influence on the [[Copernican heliocentrism|Copernican]] and [[Tychonic system]]s of astronomy.<ref>{{Harv|Rosen|1985|pp=19-20 & 21}}</ref>

In the 12th century, [[Fakhr al-Din al-Razi]] participated in the debate among Islamic scholars over whether the [[celestial spheres]] or orbits (''falak'') are "to be considered as real, concrete physical bodies" or "merely the abstract circles in the heavens traced out year in and year out by the various stars and planets." He points out that many astronomers prefer to see them as solid spheres "on which the stars turn," while others, such as the Islamic scholar Dahhak, view the celestial sphere as "not a body but merely the abstract orbit traced by the stars." Al-Razi himself remains "undecided as to which [[Celestial mechanics|celestial models]], concrete or abstract, most conform with external reality," and notes that "there is no way to ascertain the characteristics of the heavens," whether by "observable" evidence or by authority (''al-khabar'') of "divine revelation or [[Sunnah|prophetic traditions]]." He concludes that "astronomical models, whatever their utility or lack thereof for ordering the heavens, are not founded on sound rational proofs, and so no intellectual commitment can be made to them insofar as description and explanation of celestial realities are concerned."<ref name=Setia/>


===Astronomical physics and Earth's motion===
===Astronomical physics and Earth's motion===

Revision as of 21:21, 28 March 2010

Islamic cosmology refers to cosmology in Islamic societies. It is mainly derived from the Qur'an, Hadith, Sunnah, and current Islamic as well as other pre-Islamic sources. The Qur'an itself mentions seven heavens[1] and a vast universe sustained by Allah.

Overview

Types of Universe

There are two major categories of the Universe in Islam.

Judged Universe (Divine)

This is the Universe in which those species lives forever, which are judged by Allah according to the Law of Judgement. This is also known as the Perfect Universe.

Test Universe

This is the Test Universe also known as imperfect Universe. According to Quran we are in this test Universe and are being judged according to the Laws of the Judgeable Species, which is covered in Quran.

Why Test Universe is Imperfect

This Test Universe is not imperfect, but Allah has given us limited sources to search this vast universe or we can say that Allah has implemented some limitations on it. These limitations are related to his attributes.

What is the Lifecycle of Test Universe

According to Quran, Sunnah and Authentic hadith and authentic islamic documents this Test universe lifecycle is directly dependent on the lifecycle of the Judgeable Species. The Test universe is destined to be destroyed by Allah according to the Laws of Judgement of Judgeable Species.

Why to Create Universe

Islam in the light of Quran and Sunnah gives very clear details for the creation of the Universe. Few of them are as follows

To Be Known

Before the creation of the Divine Universe, Allah was known only by himself, because there was nothing in existence except Allah. According to the Attributes of Allah, it was the part of his great plan to create creatures so that all his attributes get satisfied.

Ways to know God

Allah may be known through:
- Revelation.
- Reasoning.

Knowing Allah through Revelation

In Islamic Cosmology, Allah has sent down Messengers to humankind who have conveyed His message to us about His presence. Individuals may acknowledge about Allah's existence through revelations. This is analogous to a child who goes through school and learns about various things by his or her teachers and books.

Knowing Allah through Reasoning

Individuals may also develop this awareness of God's existence through reasoning. This may include building arguments through logic or through rational arguments or via realization due to scientific or historical research for further support. For example, a physicist may choose to believe in Allah due to the depth of knowledge that person has acquired about the origin of universe (Cosmology). Similarly, a logician may choose to believe in Allah through rational arguments built upon logic. In such cases, it is through the intuition and particular set of skills that allow the individual to form a sound conclusion along with solid points to support his or her arguments. Within this construct, an individual may choose to study Quran and Hadith to further understand the rights of Allah which is an important part of Islam.

To Be Discovered

The main reason for the creation of Human being is that Allah wishes to be discovered and according to the Quran Man has been given the knowledge and capabilities to discover Allah.

Who is Judgeable and Why

All the creation of Allah are distributed in two major pools i.e. judgeables and non-judgeable. This status was given on the basis of the sacred pact that was made between these species and Allah far before the Creation of the Universe.

Judgeable Species

According to Quran, These are divided into three more types.

Already Judged Species

According to in depth study of Quran, Sunnah, Hadit and islamic literature, Angels falls in this category

Under Judgement Species

According to Quran, Jinn and Human Being are included in this Category

Future Judgeable Species

In this Category falls the infinite number of future Species. At the end of currently under judgment species (Human, Jinn) lifecycle they will be moved to already judged species with an eternal life as reward or Hell as punishment, then Allah will create a new Test Universe and one species will move from future judgeable species category to under judgment category. According to the Laws of Quran and Sunnah of Allah, only one species is judged at one time, except a few exceptional cases, such as this judgment cycle in which two species are being judged because of the Laws of Failure of Leadership.

Sufi cosmology

Main article: Sufi cosmology

Sufi cosmology (Arabic: الكوزمولوجية الصوفية) is a general term for cosmological doctrines associated with the mysticism of Sufism. These may differ from place to place, order to order and time to time, but overall show the influence of several different cosmographies:

Quranic interpretations

See also: Qur'an and science and Islam and science

There are several verses in the Qur'an (610-632) which some medieval and modern writers have interpreted as foreshadowing modern cosmological theories.[2] An early example of this can be seen in the work of the Islamic theologian Fakhr al-Din al-Razi (1149–1209), in dealing with his conception of physics and the physical world in his Matalib. He discusses Islamic cosmology, criticizes the idea of the Earth's centrality within the universe, and explores "the notion of the existence of a multiverse in the context of his commentary" on the Qur'anic verse, "All praise belongs to God, Lord of the Worlds." He raises the question of whether the term "worlds" in this verse refers to "multiple worlds within this single universe or cosmos, or to many other universes or a multiverse beyond this known universe." He rejects the Aristotelian view of a single world or universe in favour of the existence of multiple worlds and universes, a view that he believed to be supported by the Qur'an and by the Ash'ari theory of atomism.[3]

In modern times, the following verses in the Qur'an have been interpreted as foreshadowing the expansion of the universe and possibly even the Big Bang theory:[4]

Don't those who reject faith see that the heavens and the earth were a single entity then We ripped them apart?[5]

And the heavens We did create with Our Hands, and We do cause it to expand.[6]

Others have interpreted the following verse as foreshadowing the modern concept that the figure of the Earth has an ellipsoid shape:[2]

"After that (God) spread the Earth out (dahaha: from the verb 'daha')."[7]

The interpretation of this as implying an ellipsoid shape is explained by Kamel Ben Salem:

Because they did not understand the meaning of this verse, (since they did not imagine that the Earth was spherical) the ancient exegetes had earlier explained the Arabic verb (dahaha) by (has flattened it). The same explanation has been introduced in the Arab dictionaries. But in these very dictionaries, the origin of this verb is found in the word (Ud-hiya), which means, "egg of ostrich". Thus the Earth would look like an ostrich’s egg. The same verb is also used to refer to the action of rain on the pebbles, which the water current moves.[2]

As such, Rashad Khalifa alternatively translated the verse as:

He made the earth egg-shaped.[8]

Cosmology in the medieval Islamic world

See also: Astronomy in medieval Islam

Cosmology was studied extensively in the Muslim world during what is known as the Islamic Golden Age from the 7th to 15th centuries.

There are exactly seven verses in the Quran that specify that there are seven heavens. One verse says that each heaven or sky has its own order, possibly meaning laws of nature. Another verse says after mentioning the seven heavens "and similar earths".

In 850, al-Farghani wrote Kitab fi Jawani ("A compendium of the science of stars"). The book primarily gave a summary of Ptolemic cosmography. However, it also corrected Ptolemy's Almagest based on findings of earlier Iranian astronomers. Al-Farghani gave revised values for the obliquity of the ecliptic, the precessional movement of the apogees of the sun and the moon, and the circumference of the earth. The books were widely circulated through the Muslim world, and even translated into Latin.[9]

In the 14th century, the Kalam theologian Adud al-Din al-Iji (1281-1355), under the influence of the Ash'ari doctrine of occasionalism, rejected many Aristotelian cosmological theories that he insisted were purely conjectural and hypothetical, including the Aristotelian and Ptolemaic principle of uniform circular motion in the heavenly bodies.[10]

Cosmography

Main article: ʿAjā'ib al-makhlūqāt wa gharā'ib al-mawjūdāt

ʿAjā'ib al-makhlūqāt wa gharā'ib al-mawjūdāt (Arabic: عجائب المخلوقات و غرائب الموجودات, meaning Marvels of creatures and Strange things existing) is an important work of cosmography by Zakariya ibn Muhammad ibn Mahmud Abu Yahya al-Qazwini who was born in Qazwin year 600 (AH (1203 AD).

Temporal finitism

See also: Early Islamic philosophy

In contrast to ancient Greek philosophers who believed that the universe had an infinite past with no beginning, medieval philosophers and theologians developed the concept of the universe having a finite past with a beginning (see Temporal finitism). This view was inspired by the creation myth shared by the three Abrahamic religions: Judaism, Christianity and Islam. The Christian philosopher, John Philoponus, presented the first such argument against the ancient Greek notion of an infinite past. His arguments were adopted by many most notably; early Muslim philosopher, Al-Kindi (Alkindus); the Jewish philosopher, Saadia Gaon (Saadia ben Joseph); and the Muslim theologian, Al-Ghazali (Algazel). They used two logical arguments against an infinite past, the first being the "argument from the impossibility of the existence of an actual infinite", which states:[11]

"An actual infinite cannot exist."
"An infinite temporal regress of events is an actual infinite."
".•. An infinite temporal regress of events cannot exist."

The second argument, the "argument from the impossibility of completing an actual infinite by successive addition", states:[11]

"An actual infinite cannot be completed by successive addition."
"The temporal series of past events has been completed by successive addition."
".•. The temporal series of past events cannot be an actual infinite."

Both arguments were adopted by later Christian philosophers and theologians, and the second argument in particular became more famous after it was adopted by Immanuel Kant in his thesis of the first antimony concerning time.[11]

Galaxy observation

The Arabian astronomer Alhazen (965–1037) made the first attempt at observing and measuring the Milky Way's parallax,[12] and he thus "determined that because the Milky Way had no parallax, it was very remote from the earth and did not belong to the atmosphere."[13] The Persian astronomer Abū Rayhān al-Bīrūnī (973–1048) proposed the Milky Way galaxy to be "a collection of countless fragments of the nature of nebulous stars."[14] The Andalusian astronomer Ibn Bajjah ("Avempace", d. 1138) proposed that the Milky Way was made up of many stars which almost touched one another and appeared to be a continuous image due to the effect of refraction from sublunary material, citing his observation of the conjunction of Jupiter and Mars on 500 AH (1106/1107 AD) as evidence.[15][16] Ibn Qayyim Al-Jawziyya (1292–1350) proposed the Milky Way galaxy to be "a myriad of tiny stars packed together in the sphere of the fixed stars".[17]

In the 10th century, the Persian astronomer Abd al-Rahman al-Sufi (known in the West as Azophi) made the earliest recorded observation of the Andromeda Galaxy, describing it as a "small cloud".[18] Al-Sufi also identified the Large Magellanic Cloud, which is visible from Yemen, though not from Isfahan; it was not seen by Europeans until Magellan's voyage in the 16th century.[19][20] These were the first galaxies other than the Milky Way to be observed from Earth. Al-Sufi published his findings in his Book of Fixed Stars in 964.

Multiversal cosmology

Fakhr al-Din al-Razi (1149-1209), in dealing with his conception of physics and the physical world in his Matalib, discusses Islamic cosmology. He criticizes the idea of the Earth's centrality within the universe and "explores the notion of the existence of a multiverse in the context of his commentary" on the Qur'anic verse, "All praise belongs to God, Lord of the Worlds." He raises the question of whether the term "worlds" in this verse refers to "multiple worlds within this single universe or cosmos, or to many other universes or a multiverse beyond this known universe." In volume 4 of the Matalib, Al-Razi states:[3]

It is established by evidence that there exists beyond the world a void without a terminal limit (khala' la nihayata laha), and it is established as well by evidence that God Most High has power over all contingent beings (al-mumkinat). Therefore He the Most High has the power (qadir) to create a thousand thousand worlds (alfa alfi 'awalim) beyond this world such that each one of those worlds be bigger and more massive than this world as well as having the like of what this world has of the throne (al-arsh), the chair (al-kursiyy), the heavens (al-samawat) and the earth (al-ard), and the sun (al-shams) and the moon (al-qamar). The arguments of the philosophers (dala'il al-falasifah) for establishing that the world is one are weak, flimsy arguments founded upon feeble premises.

Al-Razi rejected the Aristotelian and Avicennian notions of a single universe revolving around a single world. He describes their main arguments against the existence of multiple worlds or universes, pointing out their weaknesses and refuting them. This rejection arose from his affirmation of atomism, as advocated by the Ash'ari school of Islamic theology, which entails the existence of vacant space in which the atoms move, combine and separate. He discussed more on the issue of the void in greater detail in volume 5 of the Matalib.[3] He argued that there exists an infinite outer space beyond the known world,[21] and that God has the power to fill the vacuum with an infinite number of universes.[22]

Refutations of astrology

See also: Islamic astrology

The first semantic distinction between astronomy and astrology was given by the Persian astronomer Abu Rayhan al-Biruni in the 11th century,[23] though he himself refuted astrology in another work. The study of astrology was also refuted by other Muslim astronomers at the time, including al-Farabi, Ibn al-Haytham, Avicenna and Averroes. Their reasons for refuting astrology were often due to both scientific (the methods used by astrologers being conjectural rather than empirical) and religious (conflicts with orthodox Islamic scholars) reasons.[24]

Ibn Qayyim Al-Jawziyya (1292-1350), in his Miftah Dar al-SaCadah, used empirical arguments in astronomy in order to refute the practice of astrology and divination.[25] He recognized that the stars are much larger than the planets, and thus argued:[17]

"And if you astrologers answer that it is precisely because of this distance and smallness that their influences are negligible, then why is it that you claim a great influence for the smallest heavenly body, Mercury? Why is it that you have given an influence to al-Ra's and al-Dhanab, which are two imaginary points [ascending and descending nodes]?"

Al-Jawziyya also recognized the Milky Way galaxy as "a myriad of tiny stars packed together in the sphere of the fixed stars" and thus argued that "it is certainly impossible to have knowledge of their influences."[17]

Early heliocentric models

The Babylonian astronomer, Seleucus of Seleucia, who advocated a heliocentric model in the 2nd century BC, wrote a work that was later translated into Arabic. A fragment of his work has survived only in Arabic translation, which was later referred to by the Persian philosopher Muhammad ibn Zakariya al-Razi (865-925).[26]

In the late ninth century, Ja'far ibn Muhammad Abu Ma'shar al-Balkhi (Albumasar) developed a planetary model which some have interpreted as a heliocentric model. This is due to his orbital revolutions of the planets being given as heliocentric revolutions rather than geocentric revolutions, and the only known planetary theory in which this occurs is in the heliocentric theory. His work on planetary theory has not survived, but his astronomical data was later recorded by al-Hashimi, Abū Rayhān al-Bīrūnī and al-Sijzi.[27]

In the tenth century, the Brethren of Purity wrote the Encyclopedia of the Brethren of Purity, in which some verses have been interpreted as implying a heliocentric model, particularly a verse in the Rasa'il (II, 30) which states:[28]

"...in so far as the sun is to the heavens what the king is to his kingdom and the planets are to it what soldiers, auxiliaries, and subjects generally are to the king, and the spheres are like regions and the constellations like countries and the degrees and minutes like towns, it was enjoined by divine wisdom that it should be located at the center of the universe."

In the early eleventh century, al-Biruni had met several Indian scholars who believed in a heliocentric system. In his Indica, he discusses the theories on the Earth's rotation supported by Brahmagupta and other Indian astronomers, while in his Canon Masudicus, al-Biruni writes that Aryabhata's followers assigned the first movement from east to west to the Earth and a second movement from west to east to the fixed stars. Al-Biruni also wrote that al-Sijzi also believed the Earth was moving and invented an astrolabe called the "Zuraqi" based on this idea:[29]

"I have seen the astrolabe called Zuraqi invented by Abu Sa'id Sijzi. I liked it very much and praised him a great deal, as it is based on the idea entertained by some to the effect that the motion we see is due to the Earth's movement and not to that of the sky. By my life, it is a problem difficult of solution and refutation. [...] For it is the same whether you take it that the Earth is in motion or the sky. For, in both cases, it does not affect the Astronomical Science. It is just for the physicist to see if it is possible to refute it."

In his Indica, al-Biruni briefly refers to his work on the refutation of heliocentrism, the Key of Astronomy, which is now lost:[29]

"The most prominent of both modern and ancient astronomers have deeply studied the question of the moving earth, and tried to refute it. We, too, have composed a book on the subject called Miftah 'ilm al-hai'ah (Key of Astronomy), in which we think we have surpassed our predecessors, if not in the words, at all events in the matter."

Early Hay'a program

During this period, a distinctive Islamic system of astronomy flourished. It was Greek tradition to separate mathematical astronomy (as typified by Ptolemy) from philosophical cosmology (as typified by Aristotle). Muslim scholars developed a program of seeking a physically real configuration (hay'a) of the universe, that would be consistent with both mathematical and physical principles. Within the context of this hay'a tradition, Muslim astronomers began questioning technical details of the Ptolemaic system of astronomy.[30]

Some Muslim astronomers, however, most notably Abū Rayhān al-Bīrūnī and Nasīr al-Dīn al-Tūsī, discussed whether the Earth moved and considered how this might be consistent with astronomical computations and physical systems.[31] Several other Muslim astronomers, most notably those following the Maragha school of astronomy, developed non-Ptolemaic planetary models within a geocentric context that were later adapted by the Copernican model in a heliocentric context.

Between 1025 and 1028, Ibn al-Haytham (Latinized as Alhazen), began the hay'a tradition of Islamic astronomy with his Al-Shuku ala Batlamyus (Doubts on Ptolemy). While maintaining the physical reality of the geocentric model, he was the first to criticize Ptolemy's astronomical system, which he criticized on empirical, observational and experimental grounds,[32] and for relating actual physical motions to imaginary mathematical points, lines and circles.[33] Ibn al-Haytham developed a physical structure of the Ptolemaic system in his Treatise on the configuration of the World, or Maqâlah fî hay'at al-‛âlam, which became an influential work in the hay'a tradition.[34] In his Epitome of Astronomy, he insisted that the heavenly bodies "were accountable to the laws of physics."[35]

In 1038, Ibn al-Haytham described the first non-Ptolemaic configuration in The Model of the Motions. His reform was not concerned with cosmology, as he developed a systematic study of celestial kinematics that was completely geometric. This in turn led to innovative developments in infinitesimal geometry.[36] His reformed model was the first to reject the equant[37] and eccentrics,[38] separate natural philosophy from astronomy, free celestial kinematics from cosmology, and reduce physical entities to geometrical entities. The model also propounded the Earth's rotation about its axis,[39] and the centres of motion were geometrical points without any physical significance, like Johannes Kepler's model centuries later.[40] Ibn al-Haytham also describes an early version of Occam's razor, where he employs only minimal hypotheses regarding the properties that characterize astronomical motions, as he attempts to eliminate from his planetary model the cosmological hypotheses that cannot be observed from Earth.[41]

In 1030, Abū al-Rayhān al-Bīrūnī discussed the Indian planetary theories of Aryabhata, Brahmagupta and Varahamihira in his Ta'rikh al-Hind (Latinized as Indica). Biruni stated that Brahmagupta and others consider that the earth rotates on its axis and Biruni noted that this does not create any mathematical problems.[42] Abu Said al-Sijzi, a contemporary of al-Biruni, suggested the possible heliocentric movement of the Earth around the Sun, which al-Biruni did not reject.[43] Al-Biruni agreed with the Earth's rotation about its own axis, and while he was initially neutral regarding the heliocentric and geocentric models,[44] he considered heliocentrism to be a philosophical problem.[45] He remarked that if the Earth rotates on its axis and moves around the Sun, it would remain consistent with his astronomical parameters:[46][47][48]

"Rotation of the earth would in no way invalidate astronomical calculations, for all the astronomical data are as explicable in terms of the one theory as of the other. The problem is thus difficult of solution."

Andalusian Revolt

Averroes rejected the eccentric deferents introduced by Ptolemy. He rejected the Ptolemaic model and instead argued for a strictly concentric model of the universe.

In the 11th-12th centuries, astronomers in al-Andalus took up the challenge earlier posed by Ibn al-Haytham, namely to develop an alternate non-Ptolemaic configuration that evaded the errors found in the Ptolemaic model.[49] Like Ibn al-Haytham's critique, the anonymous Andalusian work, al-Istidrak ala Batlamyus (Recapitulation regarding Ptolemy), included a list of objections to Ptolemic astronomy. This marked the beginning of the Andalusian school's revolt against Ptolemaic astronomy, otherwise known as the "Andalusian Revolt".[50]

In the late 11th century, al-Zarqali (Latinized as Arzachel) discovered that the orbits of the planets are elliptic orbits and not circular orbits,[51] though he still followed the Ptolemaic model.

In the 12th century, Averroes rejected the eccentric deferents introduced by Ptolemy. He rejected the Ptolemaic model and instead argued for a strictly concentric model of the universe. He wrote the following criticism on the Ptolemaic model of planetary motion:[52]

"To assert the existence of an eccentric sphere or an epicyclic sphere is contrary to nature. [...] The astronomy of our time offers no truth, but only agrees with the calculations and not with what exists."

Averroes' contemporary, Maimonides, wrote the following on the planetary model proposed by Ibn Bajjah (Avempace):

"I have heard that Abu Bakr [Ibn Bajja] discovered a system in which no epicycles occur, but eccentric spheres are not excluded by him. I have not heard it from his pupils; and even if it be correct that he discovered such a system, he has not gained much by it, for eccentricity is likewise contrary to the principles laid down by Aristotle.... I have explained to you that these difficulties do not concern the astronomer, for he does not profess to tell us the existing properties of the spheres, but to suggest, whether correctly or not, a theory in which the motion of the stars and planets is uniform and circular, and in agreement with observation."[53]

Ibn Bajjah also proposed the Milky Way galaxy to be made up of many stars but that it appears to be a continuous image due to the effect of refraction in the Earth's atmosphere.[15] Later in the 12th century, his successors Ibn Tufail and Nur Ed-Din Al Betrugi (Alpetragius) were the first to propose planetary models without any equant, epicycles or eccentrics. Al-Betrugi was also the first to discover that the planets are self-luminous.[54] Their configurations, however, were not accepted due to the numerical predictions of the planetary positions in their models being less accurate than that of the Ptolemaic model,[55] mainly because they followed Aristotle's notion of perfectly uniform circular motion.

Maragha Revolution

Main article: Maragheh observatory

The "Maragha Revolution" refers to the Maragheh school's revolution against Ptolemaic astronomy. The "Maragha school" was an astronomical tradition beginning in the Maragheh observatory and continuing with astronomers from Damascus and Samarkand. Like their Andalusian predecessors, the Maragha astronomers attempted to solve the equant problem and produce alternative configurations to the Ptolemaic model. They were more successful than their Andalusian predecessors in producing non-Ptolemaic configurations which eliminated the equant and eccentrics, were more accurate than the Ptolemaic model in numerically predicting planetary positions, and were in better agreement with empirical observations.[56] The most important of the Maragha astronomers included Mo'ayyeduddin Urdi (d. 1266), Nasīr al-Dīn al-Tūsī (1201-1274), Najm al-Dīn al-Qazwīnī al-Kātibī (d. 1277), Qutb al-Din al-Shirazi (1236-1311), Sadr al-Sharia al-Bukhari (c. 1347), Ibn al-Shatir (1304-1375), Ali al-Qushji (c. 1474), al-Birjandi (d. 1525) and Shams al-Din al-Khafri (d. 1550).[57]

File:Al-Tusi Nasir.jpeg
Nasīr al-Dīn al-Tūsī resolved significant problems in the Ptolemaic system with the Tusi-couple, which later played an important role in the Copernican model.

Some have described their achievements in the 13th and 14th centuries as a "Maragha Revolution", "Maragha School Revolution", or "Scientific Revolution before the Renaissance". An important aspect of this revolution included the realization that astronomy should aim to describe the behavior of physical bodies in mathematical language, and should not remain a mathematical hypothesis, which would only save the phenomena. The Maragha astronomers also realized that the Aristotelian view of motion in the universe being only circular or linear was not true, as the Tusi-couple showed that linear motion could also be produced by applying circular motions only.[58]

Unlike the ancient Greek and Hellenistic astronomers who were not concerned with the coherence between the mathematical and physical principles of a planetary theory, Islamic astronomers insisted on the need to match the mathematics with the real world surrounding them,[59] which gradually evolved from a reality based on Aristotelian physics to one based on an empirical and mathematical physics after the work of Ibn al-Shatir. The Maragha Revolution was thus characterized by a shift away from the philosophical foundations of Aristotelian cosmology and Ptolemaic astronomy and towards a greater emphasis on the empirical observation and mathematization of astronomy and of nature in general, as exemplified in the works of Ibn al-Shatir, al-Qushji, al-Birjandi and al-Khafri.[60][61][62]

Ibn al-Shatir's model for the appearances of Mercury, showing the multiplication of epicycles using the Tusi-couple, thus eliminating the Ptolemaic eccentrics and equant.

Other achievements of the Maragha school include the first empirical observational evidence for the Earth's rotation on its axis by al-Tusi and al-Qushji,[63] the separation of natural philosophy from astronomy by Ibn al-Shatir and al-Qushji,[64] the rejection of the Ptolemaic model on empirical rather than philosophical grounds by Ibn al-Shatir,[56] and the development of a non-Ptolemaic model by Ibn al-Shatir that was mathematically identical to the heliocentric Copernical model.[65]

Mo'ayyeduddin Urdi (d. 1266) was the first of the Maragheh astronomers to develop a non-Ptolemaic model, and he proposed a new theorem, the "Urdi lemma".[66] Nasīr al-Dīn al-Tūsī (1201-1274) resolved significant problems in the Ptolemaic system by developing the Tusi-couple as an alternative to the physically problematic equant introduced by Ptolemy,[67] and conceived a plausible model for elliptical orbits.[68] Tusi's student Qutb al-Din al-Shirazi (1236-1311), in his The Limit of Accomplishment concerning Knowledge of the Heavens, discussed the possibility of heliocentrism. Al-Qazwīnī al-Kātibī, who also worked at the Maragheh observatory, in his Hikmat al-'Ain, wrote an argument for a heliocentric model, though he later abandoned the idea.[43]

Medieval manuscript by Qutb al-Din al-Shirazi depicting an epicyclic planetary model.

Ibn al-Shatir (1304–1375) of Damascus, in A Final Inquiry Concerning the Rectification of Planetary Theory, incorporated the Urdi lemma, and eliminated the need for an equant by introducing an extra epicycle (the Tusi-couple), departing from the Ptolemaic system in a way that was mathematically identical to what Nicolaus Copernicus did in the 16th century. Unlike previous astronomers before him, Ibn al-Shatir was not concerned with adhering to the theoretical principles of natural philosophy or Aristotelian cosmology, but rather to produce a model that was more consistent with empirical observations. For example, it was Ibn al-Shatir's concern for observational accuracy which led him to eliminate the epicycle in the Ptolemaic solar model and all the eccentrics, epicycles and equant in the Ptolemaic lunar model. His model was thus in better agreement with empirical observations than any previous model,[56] and was also the first that permitted empirical testing.[69] His work thus marked a turning point in astronomy, which may be considered a "Scientific Revolution before the Renaissance".[56] His rectified model was later adapted into a heliocentric model by Copernicus,[67] which was mathematically achieved by reversing the direction of the last vector connecting the Earth to the Sun.[45] In the published version of his masterwork, De revolutionibus orbium coelestium, Copernicus also cites the theories of al-Battani, Arzachel and Averroes as influences,[68] while the works of Ibn al-Haytham and al-Biruni were also known in Europe at the time.

An area of active discussion in the Maragheh school, and later the Samarkand and Istanbul observatories, was the possibility of the Earth's rotation. Supporters of this theory included Nasīr al-Dīn al-Tūsī, Nizam al-Din al-Nisaburi (c. 1311), al-Sayyid al-Sharif al-Jurjani (1339-1413), Ali al-Qushji (d. 1474), and Abd al-Ali al-Birjandi (d. 1525). Al-Tusi was the first to present empirical observational evidence of the Earth's rotation, using the location of comets relevant to the Earth as evidence, which al-Qushji elaborated on with further empirical observations while rejecting Aristotelian natural philosophy altogether. Both of their arguments were similar to the arguments later used by Nicolaus Copernicus in 1543 to explain the Earth's rotation (see Astronomical physics and Earth's motion section below).[63]

Experimental astrophysics and celestial mechanics

In the 9th century, the eldest Banū Mūsā brother, Ja'far Muhammad ibn Mūsā ibn Shākir, made significant contributions to Islamic astrophysics and celestial mechanics. He was the first to hypothesize that the heavenly bodies and celestial spheres are subject to the same laws of physics as Earth, unlike the ancients who believed that the celestial spheres followed their own set of physical laws different from that of Earth.[70] In his Astral Motion and The Force of Attraction, Muhammad ibn Musa also proposed that there is a force of attraction between heavenly bodies,[71] foreshadowing Newton's law of universal gravitation.[72]

In the early 11th century, Ibn al-Haytham (Alhazen) wrote the Maqala fi daw al-qamar (On the Light of the Moon) some time before 1021. This was the first attempt successful at combining mathematical astronomy with physics and the earliest attempt at applying the experimental method to astronomy and astrophysics. He disproved the universally held opinion that the moon reflects sunlight like a mirror and correctly concluded that it "emits light from those portions of its surface which the sun's light strikes." In order to prove that "light is emitted from every point of the moon's illuminated surface," he built an "ingenious experimental device." Ibn al-Haytham had "formulated a clear conception of the relationship between an ideal mathematical model and the complex of observable phenomena; in particular, he was the first to make a systematic use of the method of varying the experimental conditions in a constant and uniform manner, in an experiment showing that the intensity of the light-spot formed by the projection of the moonlight through two small apertures onto a screen diminishes constantly as one of the apertures is gradually blocked up."[73]

Ibn al-Haytham, in his Book of Optics (1021), was also the first to discover that the celestial spheres do not consist of solid matter, and he also discovered that the heavens are less dense than the air. These views were later repeated by Witelo and had a significant influence on the Copernican and Tychonic systems of astronomy.[74]

In the 12th century, Fakhr al-Din al-Razi participated in the debate among Islamic scholars over whether the celestial spheres or orbits (falak) are "to be considered as real, concrete physical bodies" or "merely the abstract circles in the heavens traced out year in and year out by the various stars and planets." He points out that many astronomers prefer to see them as solid spheres "on which the stars turn," while others, such as the Islamic scholar Dahhak, view the celestial sphere as "not a body but merely the abstract orbit traced by the stars." Al-Razi himself remains "undecided as to which celestial models, concrete or abstract, most conform with external reality," and notes that "there is no way to ascertain the characteristics of the heavens," whether by "observable" evidence or by authority (al-khabar) of "divine revelation or prophetic traditions." He concludes that "astronomical models, whatever their utility or lack thereof for ordering the heavens, are not founded on sound rational proofs, and so no intellectual commitment can be made to them insofar as description and explanation of celestial realities are concerned."[3]

Astronomical physics and Earth's motion

Ali al-Qushji provided empirical evidence for the Earth's motion and developed an astronomical physics independent from Aristotelian physics and natural philosophy.

The work of Ali al-Qushji (d. 1474), who worked at Samarkand and then Istanbul, is seen as a late example of innovation in Islamic theoretical astronomy and it is believed he may have possibly had some influence on Nicolaus Copernicus due to similar arguments concerning the Earth's rotation. Before al-Qushji, the only astronomer to present empirical evidence for the Earth's rotation was Nasīr al-Dīn al-Tūsī (d. 1274), who used the phenomena of comets to refute Ptolemy's claim that a stationery Earth can be determined through observation. Al-Tusi, however, eventually accepted that the Earth was stationery on the basis of Aristotelian cosmology and natural philosophy. By the 15th century, the influence of Aristotelian physics and natural philosophy was declining due to religious opposition from Islamic theologians opposed to the interference of Aristotelianism in astronomy, opening up possibilities for an astronomy unrestrained by philosophy. Under this influence, Al-Qushji, in his Concerning the Supposed Dependence of Astronomy upon Philosophy, rejected Aristotelian physics and completely separated natural philosophy from astronomy, allowing astronomy to become a purely empirical and mathematical science. This allowed him to explore alternatives to the Aristotelian notion of a stationery Earth, as he explored the idea of a moving Earth. He also observed comets and elaborated on al-Tusi's argument. He took it a step further and concluded, on the basis of empirical evidence rather than speculative philosophy, that the moving Earth theory is just as likely to be true as the stationary Earth theory and that it is not possible to empirically deduce which theory is true.[63][64][75] His work was an important step away from Aristotelian physics and towards an independent astronomical physics.[76]

Despite the similarity in their discussions regarding the Earth's motion, there is uncertainty over whether al-Qushji had any influence on Copernicus. However, it is likely that they both may have arrived at similar conclusions due to using the earlier work of al-Tusi as a basis. This is more of a possibility considering "the remarkable coincidence between a passage in De revolutionibus (I.8) and one in Ṭūsī’s Tadhkira (II.1[6]) in which Copernicus follows Ṭūsī’s objection to Ptolemy’s “proofs” of the Earth’s immobility." This can be considered as evidence that not only was Copernicus influenced by the mathematical models of Islamic astronomers, but may have also been influenced by the astronomical physics they began developing and their views on the Earth's motion.[77]

In the 16th century, the debate on the Earth's motion was continued by al-Birjandi (d. 1528), who in his analysis of what might occur if the Earth were rotating, develops a hypothesis similar to Galileo Galilei's notion of "circular inertia",[78] which he described in the following observational test (as a response to one of Qutb al-Din al-Shirazi's arguments):

"The small or large rock will fall to the Earth along the path of a line that is perpendicular to the plane (sath) of the horizon; this is witnessed by experience (tajriba). And this perpendicular is away from the tangent point of the Earth’s sphere and the plane of the perceived (hissi) horizon. This point moves with the motion of the Earth and thus there will be no difference in place of fall of the two rocks."[79]

See also

Notes

  1. ^ Qur'an 2:29
  2. ^ a b c Kamel Ben Salem (2007), "The Evolution of the Universe: A New Vision" (PDF), European Journal of Science and Theology, retrieved 2010-03-19
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  4. ^ A. Abd-Allah. "The Qur'an, Knowledge, and Science". University of Southern California. Retrieved 2008-01-22.
  5. ^ Quran 21:30
  6. ^ Quran 51:47
  7. ^ Quran 79:30
  8. ^ Rashad Khalifa (2001), Quran: the final testament, p. 497, ISBN 1881893057
  9. ^ (Dallal 1999, p. 164)
  10. ^ (Huff 2003, p. 175)
  11. ^ a b c Craig, William Lane (June 1979), "Whitrow and Popper on the Impossibility of an Infinite Past", The British Journal for the Philosophy of Science, 30 (2): 165–170 [165–6], doi:10.1093/bjps/30.2.165
  12. ^ Mohamed, Mohaini (2000). Great Muslim Mathematicians. Penerbit UTM. pp. 49–50. ISBN 9835201579. OCLC 48759017.
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  29. ^ a b (Nasr 1993, pp. 135–136)
  30. ^ (Sabra 1998, pp. 293–8)
  31. ^ (Ragep, Teresi & Hart 2002)
  32. ^ (Sabra 1998, p. 300)
  33. ^ "Nicolaus Copernicus", [[Stanford Encyclopedia of Philosophy]], 2004, retrieved 2008-01-22 {{citation}}: URL–wikilink conflict (help)
  34. ^ (Langermann 1990, pp. 25–34)
  35. ^ (Duhem 1969, p. 28)
  36. ^ (Rashed 2007)
  37. ^ (Rashed 2007, pp. 20 & 53)
  38. ^ (Rashed 2007, pp. 33–4)
  39. ^ (Rashed 2007, pp. 20 & 32-33)
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  41. ^ (Rashed 2007, pp. 35–6)
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  43. ^ a b (Baker & Chapter 2002)
  44. ^ (Marmura 1965)
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  59. ^ Saliba, George (Autumn 1999), "Seeking the Origins of Modern Science?", BRIIFS, 1 (2), retrieved 2008-01-25
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  63. ^ a b c (Ragep 2001a)
  64. ^ a b (Ragep 2001b)
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  66. ^ (Saliba 1979)
  67. ^ a b (Gill 2005)
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  73. ^ Toomer, G. J. (December 1964), "Review: Ibn al-Haythams Weg zur Physik by Matthias Schramm", Isis, 55 (4): 463–465 [463–4], doi:10.1086/349914
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  78. ^ (Ragep 2001b, pp. 63–4)
  79. ^ (Ragep 2001a, pp. 152–3)

References

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