Science in the ancient world

Science in the ancient world encompasses the earliest history of science from the protoscience of prehistory and ancient history through to late antiquity. In ancient times, culture and knowledge were passed on generation to generation by means of oral tradition. The development of writing further enabled the ability to preserve knowledge and culture, allowing communication to travel across generations with greater fidelity. Science has further developed with the assistance of books.

Ancient Near East

Mesopotamia

Further information: Babylonian astronomy, Babylonian mathematics, and Babylonian medicine

See also: Baghdad Battery

Mesopotamian clay tablet-letter from 2400 BC, Louvre. (from King of Lagash, found at Girsu)

Around 3500 BC, in Sumer (now Iraq), the Mesopotamian people began preserving some observations of the cosmos with extremely thorough numerical data. The Pythagoras' law has demonstrated evidence of ancient writing forms. It was recorded in the 18th century BC on the Mesopotamian cuneiform tablet known as Plimpton 322. The columns of numbers in the tablet generates several Pythagorean triples such as (3,4,5) and (5,12,13).

Astronomy is a science that lends itself to the recording and study of observations. Scribes recorded observations of the cosmos such as the motions of the stars, the planets, and the Moon on clay tablets. The cuneiform style of writing revealed that astronomers used mathematical calculations observe the motions of the planets. Even today, astronomical periods identified by Mesopotamian scientists are still widely used in Western calendars: the solar year and the lunar month. Using the data, they developed arithmetical methods to compute the changing length of daylight during the year, and to predict the phases of the Moon and planets along with eclipses of the Sun and Moon. Only a few astronomers' names are known, such as that of Kidinnu, a Chaldean astronomer and mathematician who was contemporary with the Greek astronomers. Kiddinu's value for the solar year is in use for today's calendars. Astronomy and astrology were considered to be the same thing, as evidenced by the practice of this science in Babylonia by priests. Indeed, rather than following the modern trend towards rational science, moving away from superstition and belief, the Mesopotamian astronomy conversely became more astrology-based later in the civilisation: studying the stars in terms of horoscopes and omens, which might explain the popularity of the clay tablets. Hipparchus was to use this data to calculate the precession of the Earth's axis. Fifteen hundred years after Kiddinu, Al-Batani, born in what is now Turkey, would use the collected data and improve Hipparchus' value for the precession of the Earth's axis. Al-Batani's value, 54.5 arc-seconds per year, compares well with the current value of 49.8 arc-seconds per year (26,000 years for Earth's axis to round the circle of nutation).

Babylonian astronomy was "the first and highly successful attempt at giving a refined mathematical description of astronomical phenomena." According to the historian A. Aaboe,

all subsequent varieties of scientific astronomy, in the Hellenistic world, in India, in Islam, and in the West — if not indeed all subsequent endeavour in the exact sciences — depend upon Babylonian astronomy in decisive and fundamental ways.

Egypt

Further information: Ancient Egyptian medicine, Egyptian astronomy, and Egyptian mathematics

An Egyptian practice of treating Migraine in ancient Egypt.

Significant advances in ancient Egypt included astronomy, mathematics, and medicine. Their geometry was a necessary outgrowth of surveying to preserve the layout and ownership of farmland, which was flooded annually by the Nile River. The 3-4-5 right triangle and other rules of thumb served to represent rectilinear structures, including their post and lintel architecture. Egypt was also a centre of alchemical research for much of the Western world.

Egyptian hieroglyphs served as the basis for the Proto-Sinaitic script, the ancestor of the Phoenician alphabet from which the later Hebrew, Greek, Latin, Arabic, and Cyrillic alphabets were derived. The city of Alexandria retained preeminence with its library, which was damaged by fire when it fell under Roman rule, being destroyed before 642. With it a huge amount of antique literature and knowledge was lost.

The Edwin Smith papyrus is one of the first medical documents still extant, and perhaps the earliest document that attempts to describe and analyse the brain: it might be seen as the very beginnings of modern neuroscience. However, while Egyptian medicine had some effective practices, it was not without its ineffective and sometimes harmful practices. For example, medical historians believe that ancient Egyptian pharmacology was largely ineffective. Nevertheless, it applies the following components: examination, diagnosis, treatment and prognosis, to the treatment of disease,^[1] which display strong parallels to the basic empirical method of science and according to G. E. R. Lloyd played a significant role in the development of this methodology. The Ebers papyrus (c. 1550 BC) also contains evidence of traditional empiricism.

According to a paper published by Michael D. Parkins, 72% of 260 medical prescriptions in the Hearst Papyrus had no curative elements. According to Michael D. Parkins, sewage pharmacology first began in ancient Egypt and was continued through the Middle Ages. Practices such as applying cow dung to wounds, ear piercing and tattooing, and chronic ear infections were important factors in developing tetanus. Frank J. Snoek wrote that Egyptian medicine used fly specks, lizard blood, swine teeth, and other such remedies which he believes could have been harmful.

Persia

Main article: Science and technology in Iran

Scholar Nersi with Anahita in Persia.

In the Sassanid period (226 to 652 AD), great attention was given to mathematics and astronomy. The Academy of Gundishapur is a prominent example in this regard. Astronomical tables—such as the Shahryar Tables—date to this period, and Sassanid observatories were later imitated by Muslim astronomers and astrologers of the Islamic period. In the mid-Sassanid era, an influx of knowledge came to Persia from the West in the form of views and traditions of Greece which, following the spread of Christianity, accompanied Syriac (the official language of Christians as well as the Iranian Nestorians). The Christian schools in Iran have produced great scientists such as Nersi, Farhad, and Marabai. Also, a book was left by Paulus Persa, head of the Iranian Department of Logic and Philosophy of Aristotle, written in Syriac and dictated to Sassanid King Anushiravan.

A fortunate incident for pre-Islamic Iranian science during the Sassanid period was the arrival of eight great scholars from the Hellenistic civilization, who sought refuge in Persia from persecution by the Roman Emperor Justinian. These men were the followers of the Neoplatonic school. King Anushiravan had many discussions with these men, especially with the man named Priscianus. A summary of these discussions was compiled in a book entitled Solution to the Problems of Khosrow, the King of Persia, which is now in the Saint Germain Library in Paris. These discussions touched on several subjects, such as philosophy, physiology, metabolisms, and natural science, such as astronomy. After the establishment of Umayyad and Abbasid states, many Iranian scholars were sent to the capitals of these Islamic dynasties.

In the Early Middle Ages, Persia became a stronghold of Islamic science.

Greco-Roman world

Main article: Science in classical antiquity

Scientific thought in Classical Antiquity becomes tangible from the 6th century BC in pre-Socratic philosophy (Thales, Pythagoras). In c. 385 BC, Plato founded the Academy. With Plato's student Aristotle begins the "scientific revolution" of the Hellenistic period culminating in the 3rd to 2nd centuries with scholars such as Eratosthenes, Euclid, Aristarchus of Samos, Hipparchus and Archimedes.

Plato and Aristotle. The School of Athens (1509).

In Classical Antiquity, the inquiry into the workings of the universe took place both in investigations aimed at such practical goals as establishing a reliable calendar or determining how to cure a variety of illnesses and in those abstract investigations known as natural philosophy. The ancient people who are considered the first scientists may have thought of themselves as natural philosophers, as practitioners of a skilled profession (for example, physicians), or as followers of a religious tradition (for example, temple healers).

The earliest Greek philosophers, known as the pre-Socratics, provided competing answers to the question found in the myths of their neighbours: "How did the ordered cosmos in which we live come to be?" The pre-Socratic philosopher Thales dubbed the "father of science", was the first to postulate non-supernatural explanations for natural phenomena such as lightning and earthquakes. Pythagoras of Samos founded the Pythagorean school, which investigated mathematics for its own sake and was the first to postulate that the Earth is spherical. Subsequently, Plato and Aristotle produced the first systematic discussions of natural philosophy, which did much to shape later investigations of nature. Their development of deductive reasoning was particularly useful to later scientific inquiry.

The important legacy of this period included substantial advances in factual knowledge, especially in anatomy, zoology, botany, mineralogy, geography, mathematics and astronomy; an awareness of the importance of certain scientific problems, especially those related to the problem of change and its causes; and a recognition of the methodological importance of applying mathematics to natural phenomena and of undertaking empirical research. In the Hellenistic age scholars frequently employed the principles developed in earlier Greek thought: the application of mathematics and deliberate empirical research, in their scientific investigations. Thus, clear unbroken lines of influence lead from ancient Greek and Hellenistic philosophers, to medieval Muslim philosophers and scientists, to the European Renaissance and Enlightenment, to the secular sciences of the modern day. Neither reason nor inquiry began with the Ancient Greeks, but the Socratic method did, along with the idea of Forms, great advances in geometry, logic, and the natural sciences. Benjamin Farrington, former Professor of Classics at Swansea University wrote:

"Men were weighing for thousands of years before Archimedes worked out the laws of equilibrium; they must have had practical and intuitional knowledge of the principles involved. What Archimedes did was to sort out the theoretical implications of this practical knowledge and present the resulting body of knowledge as a logically coherent system."

and again:

"With astonishment we find ourselves on the threshold of modern science. Nor should it be supposed that by some trick of translation, the extracts have been given an air of modernity. Far from it. The vocabulary of these writings and their style are the source from which our own vocabulary and style have been derived."

Schematic of the Antikythera mechanism

The level of achievement in Hellenistic astronomy and engineering is impressively shown by the Antikythera mechanism (150-100 BC). The astronomer Aristarchus of Samos was the first known person to propose a heliocentric model of the solar system, while the geographer Eratosthenes accurately calculated the circumference of the Earth. Hipparchus (c. 190 – c. 120 BC) produced the first systematic star catalog. In medicine, Herophilos (335 - 280 BC) was the first to base his conclusions on the dissection of the human body and to describe the nervous system. Hippocrates (c. 460 BC – c. 370 BC) and his followers were the first to describe many diseases and medical conditions. Galen (129 – c. 200 AD) performed many audacious operations—including brain and eye surgeries— that were not tried again for almost two millennia. The mathematician Euclid laid down the foundations of mathematical rigour and introduced the concepts of definition, axiom, theorem and proof still in use today in his Elements, considered the most influential textbook ever written. Archimedes, considered one of the greatest mathematicians of all time, is credited with using the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of pi. He is also known in physics for laying the foundations of hydrostatics and the explanation of the principle of the lever.

Pliny the Elder: an imaginative 19th Century portrait

Theophrastus wrote some of the earliest descriptions of plants and animals, establishing the first taxonomy and looking at minerals in terms of their properties such as hardness. Pliny the Elder produced what is one of the largest encyclopedias of the natural world in 77 AD, and must be regarded as the rightful successor to Theophrastus.

the octahedral shape of diamond.

For example, he accurately describes the octahedral shape of the diamond. He proceeds to mention that diamond dust is used by engravers to cut and polish other gems owing to its great hardness. His recognition of the importance of crystal shape is a precursor to modern crystallography, while mentioning numerous other minerals presages mineralogy. He also recognises that other minerals have characteristic crystal shapes, but in one example, confuses the crystal habit with the work of lapidaries. He was also the first to recognise that amber was a fossilized resin from pine trees because he had seen samples with trapped insects within them.

India

Main article: Science and technology in ancient India

See also: Indian astronomy, Indian mathematics, Ayurveda, and History of metallurgy in the Indian subcontinent

Ancient India was an early leader in metallurgy, as evidenced by the wrought iron Pillar of Delhi.

Excavations at Harappa, Mohenjo-daro and other sites of the Indus Valley civilization (IVC) have uncovered evidence of the use of "practical mathematics". The people of the IVC manufactured bricks whose dimensions were in the proportion 4:2:1, considered favourable for the stability of a brick structure. They used a standardised system of weights based on the ratios 1⁄20, 1⁄10, 1⁄5, 1⁄2, 1, 2, 5, 10, 20, 50, 100, 200, and 500, with the unit weight equaling approximately 28 grams (and approximately equal to the English ounce or Greek uncia). They mass-produced weights in regular geometrical shapes, which included hexahedra, barrels, cones, and cylinders, thereby demonstrating knowledge of basic geometry.

The inhabitants of the Indus civilisation also tried to standardise the measurement of length to a high degree of accuracy. They designed a ruler—the Mohenjo-Daro ruler—whose unit of length (approximately 1.32 inches or 3.4 centimetres) was divided into ten equal parts. Bricks manufactured in ancient Mohenjo-Daro often had dimensions that were integral multiples of this unit of length.

Mehrgarh, a Neolithic IVC site, provides the earliest known evidence for in vivo drilling of human teeth, with recovered samples dated to 7000–5500 BCE.

Early astronomy in India, as in other cultures, was intertwined with religion. The first textual mention of astronomical concepts comes from the Vedas—religious literature of India. According to Sarma (2008): "One finds in the Rigveda intelligent speculations about the genesis of the universe from nonexistence, the configuration of the universe, the spherical self-supporting Earth, and the year of 360 days divided into 12 equal parts of 30 days each with a periodical intercalary month."

Classical Indian astronomy documented in literature spans the Maurya (Vedanga Jyotisha, c. 5th century BCE) to the Vijayanagara (South India) (such as the 16th century Kerala school) periods. The first named authors writing treatises on astronomy emerged from the 5th century, the date when the classical period of Indian astronomy can be said to begin. Besides the theories of Aryabhata in the Aryabhatiya and the lost Arya-siddhānta, we find the Pancha-Siddhāntika of Varahamihira. The astronomy and the astrology of ancient India (Jyotisha) are based upon sidereal calculations. However, a tropical system was also used in a few cases.

Alchemy (Rasaśāstra in Sanskrit) was popular in India. It was the Indian alchemist and philosopher Kanada who introduced the concept of 'anu' which he defined as the matter which cannot be subdivided. This is analogous to the concept of the atom in modern science.

Linguistics (along with phonology, morphology, etc.) first arose among Indian grammarians studying the Sanskrit language. Aacharya Hemachandrasuri wrote grammars of Sanskrit and Prakrit, poetry, prosody, lexicons, texts on science and logic and many branches of Indian philosophy. The Siddha-Hema-Śabdanuśāśana includes six Prakrit languages: the "standard" Prakrit (virtually Maharashtri Prakrit), Shauraseni, Magahi, Paiśācī, the otherwise-unattested Cūlikāpaiśācī and Apabhraṃśa (virtually Gurjar Apabhraṃśa, prevalent in the area of Gujarat and Rajasthan at that time and the precursor of Gujarati language). He gave a detailed grammar of Apabhraṃśa and illustrated it with the folk literature of the time for better understanding. It is the only known Apabhraṃśa grammar. The Sanskrit grammar of Pāṇini (c. 520 – 460 BCE) contains a particularly detailed description of Sanskrit morphology, phonology and roots, evincing a high level of linguistic insight and analysis.

Ayurveda medicine traces its origins to the Vedas, Atharvaveda in particular, and is connected to Hindu religion. The Sushruta Samhita of Sushruta appeared during the 1st millennium BCE. Ayurvedic practice was flourishing during the time of Buddha (around 520 BCE), and in this period the Ayurvedic practitioners were commonly using Mercuric-sulphur combination based medicines. An important Ayurvedic practitioner of this period was Nagarjuna, accompanied by Surananda, Nagbodhi, Yashodhana, Nityanatha, Govinda, Anantdev, Vagbhatta and others. During the regime of Chandragupta Maurya (375-415 CE), Ayurveda was part of mainstream Indian medical techniques, and continued to be so until the Colonial period.

The main authors of classical Indian mathematics (400 CE to 1200 CE) were scholars like Mahaviracharya, Aryabhata, Brahmagupta, and Bhaskara II. Indian mathematicians made early contributions to the study of the decimal number system, zero, negative numbers, arithmetic, and algebra. In addition, trigonometry, having evolved in the Hellenistic world and having been introduced into ancient India through the translation of Greek works, was further advanced in India, and, in particular, the modern definitions of sine and cosine were developed there. These mathematical concepts were transmitted to the Middle East, China, and Europe and led to further developments that now form the foundations of many areas of mathematics.

China and East Asia

Main articles: History of science and technology in China and Science and technology of the Han dynasty

Further information: Traditional Asian medicine, Traditional Chinese medicine, Chinese herbology, Chinese astronomy, Chinese mathematics, List of Chinese inventions, List of Chinese discoveries, History of Chinese archaeology, Chinese alchemy, Chinese architecture, Four Great Inventions, History of Science and technology in Korea, and History of science and technology in Japan

Joseph Needham (1900–1995), who outlined China's "Four Great Inventions" (papermaking, compass, printing, and gunpowder) in his Science and Civilisation in China, highlights the Han dynasty (202 BC – 220 AD) in particular as one of the most pivotal eras for Chinese sciences, noting the period's significant advancements in Chinese astronomy and calendar making, the systematic documentation of living organisms in early forms of botany and zoology, and the philosophical skepticism and rationalism of the age embodied in works such as the Lunheng by Wang Chong (27–100 AD). Concurring with Needham, professors Jin Guantao (Chinese University of Hong Kong, Fan Hongye (Chinese Academy of Sciences), and Liu Qingfeng (Chinese University of Hong Kong) emphasize the Han dynasty as a unique period for Chinese scientific advancements comparable to the medieval Song dynasty (960–1279 AD), but stress that the protoscientific ideas of philosophical Mohism developed during the Warring States period (475–221 BC) that could have provided a definitive structure for Chinese science was hindered by Chinese theology and dynastic royal promotion of Confucianism and its literary classics. Needham and most scholars recognised that cultural factors prevented these Chinese achievements from developing into what might be considered "modern science". It was the religious and philosophical framework of the Chinese intellectuals that made them unable to believe in the ideas of laws of nature:

It was not that there was no order in nature for the Chinese, but rather that it was not an order ordained by a rational personal being, and hence there was no conviction that rational personal beings would be able to spell out in their lesser earthly languages the divine code of laws which he had decreed aforetime. The Taoists, indeed, would have scorned such an idea as being too naïve for the subtlety and complexity of the universe as they intuited it.

— Joseph Needham, Science and Civilization in China, vol. 2, p. 581.

Islamic science

Main article: Science in the medieval Islamic world

There are several periods involved in the history of science which is continued to this day. One major period is between the 7th and 16th centuries which marks the period of the embarking of Islamic science under the development of Islamic civilizations. There are many reasons why science flourished in this period within the region. The most important reason was that the Islamic religion and the Islamic government greatly supported the researchers further expanding their knowledge of science, researchers were also greatly respected by the people. Among the researchers, there was Ibn Sina, of the many things he did including writing The Canon of Medicine; he established free hospitals and developed many great treatments unknown to man. Another person to receive recognition was Al-Riza who wrote a treatise on small-pox and measles, he created separate wings in hospitals for the mentally ill which was unheard of. Besides these two men, many other researchers expanded the knowledge of Science within the Islamic civilizations. When there is a rise there will always be a fall. The reign of knowledge in Science has mostly ended in the Islamic civilizations. When religious leaders started to gain more political power within the community, most researches done on scientific topics started to come to a halt.

Islamic medicine

During this period, many attributions were made to the medical knowledge known to man, and this completely changed the face of medicine before this time. Before this time, there was some knowledge that the Islamic researchers and people had access to, like Hippocrates and Galen being the main two, with this knowledge, they could further expand the topics of Medicine. As mentioned before, one of the two main physicians within this time period was Ibn-Sina who wrote The Canon of Medicine. He was a very important figure to the expansion of knowledge. The Canon of Medicine, is still the most popular and most used medical textbook in the world. This book is divided into five chapters: Chapter one: is a basic knowledge of medical principles as well an overview of anatomy and therapeutic procedures; chapter two: an overview of medical substances and their general properties; chapter three: contains diagnosis and treatments of diseases known to a specific body part or organ; chapter four: covers conditions or diseases not specific to one part of the body; and finally chapter five: is on compound remedies and their formulas.

The second main researcher of the reign in expanding knowledge during the Islamic period was Al-Riza, sometimes known in the Medieval period as the greatest physician of his time. Al-Riza created over two-hundred works, and over half of those works are basically on medical knowledge. The most important work that Riza ever did was "Kitab al-Hawi fi al-tibb" or commonly known as "The Comprehensive book of Medicine." This is considered one of his most important works because it was created by his personal medical notes collected throughout the years on everything he had read as well as observations of medical experiences he personally witnessed. The Kitab al-Hawi fi al-tibb is a collaboration of 23 volumes all containing different information. Each volume dives into details on specific diseases and parts of the body.

Many other important figures within this period further expanded the knowledge of medicine but Ibn-Sina and Al-Riza are acknowledged to be the most important figures of this time.

Islamic astronomy

Another huge area of expansion during the 7th and 16th centuries was the topic of astronomy there were many contributions made to astronomy during this time. There were a lot of known information before the start of research from many other places. The Islamic people helped update the mathematics for measuring and calculating the movements of the plants or "the heavenly bodies". This was not the only thing they were doing they also were updating models for the movement of the heavenly bodies. Many people contributed to these updates and other research, but there are a few that stood out.

Abd al-Rahman al-Sufi was one of the most influential figures in improving the geometrical models of Ptolemy. Abd wrote the Book of the Images of the Fixed Stars which described the forty-eight constellations formed by fixed stars. Abd al-Rahman al-Sufi was a very important figure because of the expansions he made in the world of Astronomy to this time.

The study of Astrology was also another huge expansion in the turn of the century in Islam. Three main figures were Abu Ma'shar al-Balkhi, al-Biruni and Nasir al-Din al-Tusi these three men all wrote Treatise having to deal with astrology. Many believe these Treatise were going against the Islamic religion and would have people turn away from their religion but they were wrong. People were hired by Royal Courts to decide when to announce important information and when to make decisions on specific topics. Astrologers would even help people predict their futures and read their horoscopes.

Conclusion

The Islamic period was very enlightening to the people's medical and astrological views. These researchers, scientists, and astronomers completely changed the outlook of these topics for the better. Many wrote treatises and books to outline their studies so that information could be spread and people would learn what was truly out there in the world. Medical advances were made and further helped us understand the body we live in today. There were astronomical advances that could help future astronomers figure out the universe we live in and what is out there. Many of these books and treatises are still used and studied today and have withstood the test of time. The Canon of Medicine is still one of the most used textbooks in medical history today. People like Ibn-Sina and Abd al-Rahman al-Sufi helped put the topic of Islamic Science in our textbooks today.

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