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Science in medival Islam, also known as Islamic science, is a term used in the history of science to refer to the science developed in the Islamic world between 7th and 16th centuries, a period also known as the Islamic Golden Age. Most texts during this period were written in Arabic, a lingua franca of this period, although most scientists were Muslims but they were of diverse ethnicity (mostly Persian but also some of Arab, Berber, Moorish, and Turkic background), in addition to some from other religious backgrounds (Christian, Jewish, Sabian, Zoroastrian, and irreligious).
e are several different views on Islamic science among historians of science.
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Encyclopedia
Science in medival Islam, also known as Islamic science, is a term used in the history of science to refer to the science developed in the Islamic world between 7th and 16th centuries, a period also known as the Islamic Golden Age. Most texts during this period were written in Arabic, a lingua franca of this period, although most scientists were Muslims but they were of diverse ethnicity (mostly Persian but also some of Arab, Berber, Moorish, and Turkic background), in addition to some from other religious backgrounds (Christian, Jewish, Sabian, Zoroastrian, and irreligious).
Overview
Views of historians and scholars
There are several different views on Islamic science among historians of science. The traditionalist view, as exemplified by Bertrand Russell, holds that Islamic science, while admirable in many technical ways, lacked the intellectual energy required for innovation and was chiefly important as a preserver of ancient knowledge and transmitter to medieval Europe. The revisionist view, as exemplified by Abdus Salam and George Saliba, holds that a Muslim scientific revolution occurred during the Middle Ages, an expression with which scholars such as Donald Routledge Hill and Ahmad Y Hassan express the view that Islam was the driving force behind the Muslim achievements, while Robert Briffault even sees Islamic science as the foundation of modern science. The most prominent view in recent scholarship, however, as examplified by Toby E. Huff, Will Durant, Fielding H. Garrison, Muhammad Iqbal Hossein Nasr and Bernard Lewis, holds that Muslim scientists did help in laying the foundations for an experimental science with their contributions to the scientific method and their empirical, experimental and quantitative approach to scientific inquiry, but that their work cannot be considered a Scientific Revolution, like that which occurred in early modern Europe and led to the emergence of modern science, with the exception of Ibn al-Haytham's Book of Optics which is widely considered a revolution in the fields of optics and visual perception.
Rise
During the early Muslim conquests, the Muslim Arab forces, led primarily by Khalid ibn al-Walid, conquered the Sassanid Persian Empire and more than half of the Byzantine Roman Empire, establishing the Arab Empire across the Middle East, Central Asia, and North Africa, followed by further expansions across Pakistan, southern Italy and the Iberian Peninsula. As a result, the Islamic governments inherited the knowledge and skills of the ancient Middle East, of Greece, of Persia and of India
The art of papermaking was obtained from two Chinese prisoners at the Battle of Talas (751), resulting in paper mills being built in Samarkand and Baghdad. The Arabs improved upon the Chinese techniques using linen rags instead of mulberry bark.
Most notable Arab scientists and Iranian scientists lived and practiced during the Islamic Golden Age, though not all scientists in Islamic civilization were Arab or Muslim. Some argue that the term "Arab-Islamic" does not appreciate the rich diversity of eastern scholars who have contributed to science in that era.
During the Islamic Golden Age, Muslim scholars made significant advances in science, mathematics, medicine, astronomy, engineering, and many other fields. During this time, early Islamic philosophy developed and was often pivotal in scientific debates — key figures were usually scientists and philosophers.
The number of important and original Arabic works written on the mathematical sciences is much larger than the combined total of Latin and Greek works on the mathematical sciences.
Scientific institutions
A number of important institutions previously unknown in the ancient world have their origins in the medieval Islamic world, with the most notable examples being: the public hospital (which replaced healing temples and sleep temples) and psychiatric hospital, the public library and lending library, the academic degree-granting university, the astronomical observatory as a research institute (as opposed to a private observation post as was the case in ancient times), and the trust (Waqf).
The first universities which issued diplomas were the Bimaristan medical university-hospitals of the medieval Islamic world, where medical diplomas were issued to students of Islamic medicine who were qualified to be practicing doctors of medicine from the 9th century. Sir John Bagot Glubb wrote:
The Guinness Book of World Records recognizes the University of Al Karaouine in Fez, Morocco as the oldest university in the world with its founding in 859. Al-Azhar University, founded in Cairo, Egypt in the 10th century, offered a variety of academic degrees, including postgraduate degrees, and is often considered the first full-fledged university.
A number of distinct features of the modern library were introduced in the Islamic world, where libraries not only served as a collection of manuscripts as was the case in ancient libraries, but also as a public library and lending library, a centre for the instruction and spread of sciences and ideas, a place for meetings and discussions, and sometimes as a lodging for scholars or boarding school for pupils. The concept of the library catalog was also introduced in medieval Islamic libraries, where books were organized into specific genres and categories.
Another common feature during the Islamic Golden Age was the large number of Muslim polymaths or "universal geniuses", scholars who contributed to many different fields of knowledge. Muslim polymaths were known as "Hakeems" and they had a wide breadth of knowledge in many different fields of religious and secular learning, comparable to the later "Renaissance Men", such as Leonardo da Vinci, of the European Renaissance period. Polymath scholars were so common during the Islamic Golden Age that it was rare to find a scholar who specialized in any single field at the time. Notable Muslim polymaths included al-Biruni, al-Jahiz, al-Kindi, Abu Bakr Muhammad al-Razi, Ibn Sina, al-Idrisi, Ibn Bajja, Ibn Zuhr, Ibn Tufayl, Ibn Rushd, al-Suyuti Geber, al-Khwarizmi, the Banu Musa, Abbas Ibn Firnas, al-Farabi, al-Masudi, al-Muqaddasi, Alhacen, Omar Khayyám, al-Ghazali, al-Khazini, Avempace, al-Jazari, Ibn al-Nafis, Nasir al-Din al-Tusi, Ibn al-Shatir, Ibn Khaldun, and Taqi al-Din, among many others.
Decline
Islamic science and the numbers of Islamic scientists were traditionally believed to have begun declining from the 12th or 13th centuries. It was believed that, though the Islamic civilization would still produce scientists, that they became the exception, rather than the rule (see List of Islamic scholars). Recent scholarship, however, has come to question this traditional picture of decline, pointing to continued astronomical activity as a sign of a continuing and creative scientific tradition through to the 16th century, of which the work of Ibn al-Shatir (1304–1375) in Damascus is considered the most noteworthy example. This was also the case for other areas of Islamic science, such as medicine, exemplified by the works of Ibn al-Nafis and Serafeddin Sabuncuoglu, and the social sciences, exemplified by Ibn Khaldun's Muqaddimah (1370), which itself points out that science was declining in Iraq, Al-Andalus and Maghreb, but continuing to flourish in Persia, Syria and Egypt.
One reason given for the scientific decline was when the orthodox Ash'ari school of theology challenged the more rational Mu'tazili school of theology, with al-Ghazali's The Incoherence of the Philosophers (Tahafut al-falasifa) being the most notable example. This interpretation was introduced by the Hungarian Orientalist Ignaz Goldziher, who believed that there was an intrinsic antagonism between Islamic orthodoxy and the Greek-influenced traditions of science. Recent scholarship has questioned this traditional view, however, with a number of scholars pointing out that the Ash'ari school supported science but were only opposed to speculative philosophy and that some of the greatest Muslim scientists such as Alhazen, Biruni, Ibn al-Nafis and Ibn Khaldun were themselves followers of the Ash'ari school. Emilie Savage-Smith also pointed out that Al-Ghazali's positive views towards medicine, particularly anatomy, were a source of encouragement for the increased use of dissection by Muslim physicians (such as Avenzoar and Ibn al-Nafis) in the 12th and 13th centuries.
Other reasons for the decline of Islamic science include conflicts between the Sunni and Shia Muslims, and invasions by Crusaders and Mongols on Islamic lands between the 11th and 13th centuries, especially the Mongol invasions of the 13th century. The Mongols destroyed Muslim libraries, observatories, hospitals, and universities, culminating in the destruction of Baghdad, the Abbasid capital and intellectual centre, in 1258, which is traditionally believed to have marked an end to the Islamic Golden Age.
From the 13th century, some traditionalist Muslims believed that the Crusades and Mongol invasions may have been a divine punishment from God against Muslims deviating from the Sunnah, a view that was held even by the famous polymath Ibn al-Nafis. Such traditionalist views as well as numerous wars and conflicts at the time are believed to have created a climate which made Islamic science less successful than before. However, Y. Ziedan has pointed out that the sack of Baghdad in 1258 was followed by intense scientific activity across Damascus and Cairo, as many Muslim scholars wrote huge encyclopedias (including an 80-volume medical encyclopedia by Ibn al-Nafis) in an attempt to preserve the scientific heritage of the Islamic world and cope with the loss of Baghdad.
Another reason given for the decline of Islamic science is the disruption to the cycle of equity based on Ibn Khaldun's famous model of Asabiyyah (the rise and fall of civilizations), which points to the decline being mainly due to political and economic factors rather than religious factors. With the fall of Islamic Spain in 1492, the scientific and technological initiative of the Islamic world was inherited by Europeans and laid the foundations for Europe's Renaissance and Scientific Revolution.
Influence on European science
Contributing to the growth of European science was the major search by European scholars for new learning which they could only find among Muslims, especially in Islamic Spain and Sicily. These scholars translated new scientific and philosophical texts from Arabic into Latin.
One of the most productive translators in Spain was Gerard of Cremona, who translated 87 books from Arabic to Latin,
including Muhammad ibn Musa al-Khwarizmi's On Algebra and Almucabala, Jabir ibn Aflah's Elementa astronomica,
al-Kindi's On Optics, Ahmad ibn Muhammad ibn Kathir al-Farghani's On Elements of Astronomy on the Celestial Motions, al-Farabi's On the Classification of the Sciences,
the chemical and medical works of Razi,
the works of Thabit ibn Qurra and Hunayn ibn Ishaq,
and the works of Arzachel, Jabir ibn Aflah, the Banu Musa, Abu Kamil Shuja ibn Aslam, Abu al-Qasim, and Ibn al-Haytham (including the Book of Optics).
Other Arabic works translated into Latin during the 12th century include the works of Muhammad ibn Jabir al-Harrani al-Battani and Muhammad ibn Musa al-Khwarizmi (including The Compendious Book on Calculation by Completion and Balancing),
the works of Abu al-Qasim (including the al-Tasrif),
Muhammad al-Fazari's Great Sindhind (based on the Surya Siddhanta and the works of Brahmagupta),
the works of Razi and Avicenna (including The Book of Healing and The Canon of Medicine),
the works of Averroes,
the works of Thabit ibn Qurra, al-Farabi, Ahmad ibn Muhammad ibn Kathir al-Farghani, Hunayn ibn Ishaq, and his nephew Hubaysh ibn al-Hasan,
the works of al-Kindi, Abraham bar Hiyya's Liber embadorum, Ibn Sarabi's (Serapion Junior) De Simplicibus,
the works of Qusta ibn Luqa,
the works of Maslamah Ibn Ahmad al-Majriti, Ja'far ibn Muhammad Abu Ma'shar al-Balkhi, and al-Ghazali,
the works of Nur Ed-Din Al Betrugi, including On the Motions of the Heavens,
Ali ibn Abbas al-Majusi's medical encyclopedia, The Complete Book of the Medical Art,
Abu Mashar's Introduction to Astrology,
the works of Maimonides, Ibn Zezla (Byngezla), Masawaiyh, Serapion, al-Qifti, and Albe'thar.
Abu Kamil Shuja ibn Aslam's Algebra,
the chemical works of Geber, and the De Proprietatibus Elementorum, an Arabic work on geology written by a pseudo-Aristotle. By the beginning of the 13th century, Mark of Toledo translated the Qur'an and various medical works.
Fibonacci presented the first complete European account of the Hindu-Arabic numeral system from Arabic sources in his Liber Abaci (1202). Al-Khazini's Zij as-Sanjari was translated into Greek by Gregory Choniades in the 13th century and was studied in the Byzantine Empire. The astronomical corrections to the Ptolemaic model made by al-Battani and Averroes and the non-Ptolemaic models produced by Mo'ayyeduddin Urdi (Urdi lemma), Nasir al-Din al-Tusi (Tusi-couple) and Ibn al-Shatir were later adapted into the Copernican heliocentric model. Al-Kindi's (Alkindus) law of terrestrial gravity influenced Robert Hooke's law of celestial gravity, which in turn inspired Newton's law of universal gravitation. Abu al-Rayhan al-Biruni's Ta'rikh al-Hind and Kitab al-qanun al-Mas’udi were translated into Latin as Indica and Canon Mas’udicus respectively. Ibn al-Nafis' Commentary on Compound Drugs was translated into Latin by Andrea Alpago (died 1522), who may have also translated Ibn al-Nafis' Commentary on Anatomy in the Canon of Avicenna, which first described pulmonary circulation and coronary circulation, and which may have had an influence on Michael Servetus, Realdo Colombo and William Harvey. Translations of the algebraic and geometrical works of Ibn al-Haytham, Omar Khayyám and Nasir al-Din al-Tusi were later influential in the development of non-Euclidean geometry in Europe from the 17th century. Ibn Tufail's Hayy ibn Yaqdhan was translated into Latin by Edward Pococke in 1671 and into English by Simon Ockley in 1708 and became "one of the most important books that heralded the Scientific Revolution." Ibn al-Baitar's Kitab al-Jami fi al-Adwiya al-Mufrada also had an influence on European botany after it was translated into Latin in 1758.
Scientific method
Muslim scientists placed a greater emphasis on experimentation than previous ancient civilizations (for example, Greek philosophy placed a greater emphasis on rationality rather than empiricism), which was due to the emphasis on empirical observation found in the Qur'an and Sunnah, (cf. Bettany, Laurence (1995), "Ibn al-Haytham: an answer to multicultural science teaching?", Physics Education 30: 247-252 [247]) and the rigorous historical methods established in the science of hadith. Muslim scientists thus combined precise observation, controlled experiment and careful records with a new approach to scientific inquiry which led to the development of the scientific method. In particular, the empirical observations and experiments of Ibn al-Haytham (Alhacen) in his Book of Optics (1021) is seen as the beginning of the modern scientific method, which he first introduced to optics and psychology. Rosanna Gorini writes:
Other early experimental methods were developed by Geber (for chemistry), Muhammad al-Bukhari (for history and the science of hadith), al-Kindi (for the Earth sciences), Avicenna (for medicine), Abu Rayhan al-Biruni (for astronomy and mechanics), Ibn Zuhr (for surgery) and Ibn Khaldun (for the social sciences). The most important development of the scientific method, the use of experimentation and quantification to distinguish between competing scientific theories set within a generally empirical orientation, was introduced by Muslim scientists.
Ibn al-Haytham, a pioneer of modern optics, used the scientific method to obtain the results in his Book of Optics. In particular, he combined observations, experiments and rational arguments to show that his modern intromission theory of vision, where rays of light are emitted from objects rather than from the eyes, is scientifically correct, and that the ancient emission theory of vision supported by Ptolemy and Euclid (where the eyes emit rays of light), and the ancient intromission theory supported by Aristotle (where objects emit physical particles to the eyes), were both wrong. It is known that Roger Bacon was familiar with Ibn al-Haytham's work. Ibn al-Haytham is featured on the 10,000 Iraqi dinar note.
Ibn al-Haytham developed rigorous experimental methods of controlled scientific testing in order to verify theoretical hypotheses and substantiate inductive conjectures. Ibn al-Haytham's scientific method was similar to the modern scientific method in that it consisted of the following procedures:
- Observation
- Statement of problem
- Formulation of hypothesis
- Testing of hypothesis using experimentation
- Analysis of experimental results
- Interpretation of data and formulation of conclusion
- Publication of findings
The development of the scientific method is considered to be fundamental to modern science and some — especially philosophers of science and practicing scientists — consider earlier inquiries into nature to be pre-scientific. Some consider Ibn al-Haytham to be the "first scientist" for this reason.
In The Model of the Motions, 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.
Robert Briffault wrote in The Making of Humanity:
George Sarton wrote in the Introduction to the History of Science:
Oliver Joseph Lodge wrote in the Pioneers of Science:
Muhammad Iqbal wrote in The Reconstruction of Religious Thought in Islam:
Peer review
The first documented description of a peer review process is found in the Ethics of the Physician written by Ishaq bin Ali al-Rahwi (854–931) of al-Raha, Syria, who describes the first medical peer review process. His work, as well as later Arabic medical manuals, state that a visiting physician must always make duplicate notes of a patient's condition on every visit. When the patient was cured or had died, the notes of the physician were examined by a local medical council of other physicians, who would review the practising physician's notes to decide whether his/her performance have met the required standards of medical care. If their reviews were negative, the practicing physician could face a lawsuit from a maltreated patient.
Applied sciences
Fielding H. Garrison wrote in the History of Medicine:
In the applied sciences, a significant number of inventions and technologies were produced by medieval Muslim scientists and engineers such as Abbas Ibn Firnas, Taqi al-Din, and particularly al-Jazari, who is considered a pioneer in modern engineering. Some of the inventions believed to have come from the medieval Islamic world include the programmable automaton, coffee, the soap bar, shampoo, pure distillation, liquefaction, crystallisation, purification, oxidisation, evaporation, filtration, distilled alcohol, uric acid, nitric acid, alembic, the crankshaft, the valve,the combination lock, quilting, the pointed arch, the scalpel, the bone saw, forceps, surgical catgut, the windmill, inoculation, the fountain pen, cryptanalysis, frequency analysis, the three-course meal, stained glass and quartz glass, Persian carpet, the celestial globe, explosive rockets and incendiary devices, and artificial pleasure gardens.
Agricultural sciences
During the Muslim Agricultural Revolution, Muslim scientists made significant advances in botany and laid the foundations of agricultural science. Muslim botanists and agriculturists demonstrated advanced agronomical, agrotechnical and economic knowledge in areas such as meteorology, climatology, hydrology, soil occupation, and the economy and management of agricultural enterprises. They also demosntrated agricultural knowledge in areas such as pedology, agricultural ecology, irrigation, preparation of soil, planting, spreading of manure, killing herbs, sowing, cutting trees, grafting, pruning vine, prophylaxis, phytotherapy, the care and improvement of cultures and plants, and the harvest and storage of crops.
Al-Dinawari (828-896) is considered the founder of Arabic botany for his Book of Plants, in which he described at least 637 plants and discussed plant evolution from its birth to its death, describing the phases of plant growth and the production of flowers and fruit.
In the 13th century, the Andalusian-Arabian biologist Abu al-Abbas al-Nabati developed an early scientific method for botany, introducing empirical and experimental techniques in the testing, description and identification of numerous materia medica, and separating unverified reports from those supported by actual tests and observations. His student Ibn al-Baitar published the Kitab al-Jami fi al-Adwiya al-Mufrada, which is considered one of the greatest botanical compilations in history, and was a botanical authority for centuries. It contains details on at least 1,400 different plants, foods, and drugs, 300 of which were his own original discoveries. His work was also influential in Europe after it was translated into Latin in 1758.
Medicine
Muslim physicians made many significant advances and contributions to medicine, including anatomy, ophthalmology, pathology, the pharmaceutical sciences (including pharmacy and pharmacology), physiology, and surgery. Muslim physicians set up some of the earliest dedicated hospitals, which later spread to Europe during the Crusades, inspired by the hospitals in the Middle East.(cf. Dr. A. Zahoor and Dr. Z. Haq (1997), , Cyberistan.
Al-Kindi wrote De Gradibus, in which he first demonstrated the application of quantification and mathematics to medicine, particularly in the field of pharmacology. This includes the development of a mathematical scale to quantify the strength of drugs, and a system that would allow a doctor to determine in advance the most critical days of a patient's illness. Razi (Rhazes) (865-925), a pioneer of pediatrics, recorded clinical cases of his own experience and provided very useful recordings of various diseases. His Comprehensive Book of Medicine, which introduced measles and smallpox, was very influential in Europe. In his Doubts about Galen, al-Razi was also the first to prove both Galen's theory of humorism and Aristotle's theory of classical elements false using experimentation. He also introduced urinalysis and stool tests.
Abu al-Qasim (Abulcasis), considered a pioneer of modern surgery, wrote the Al-Tasrif (1000), a 30-volume medical encyclopedia which was taught at Muslim and European medical schools until the 17th century. He invented numerous surgical instruments, including the first instruments unique to women, as well as the surgical uses of catgut and forceps, the ligature, surgical needle, scalpel, curette, retractor, surgical spoon, sound, surgical hook, surgical rod, and specula, bone saw, and plaster. In 1021, Ibn al-Haytham (Alhacen) made important advances in eye surgery, as he studied and correctly explained the process of sight and visual perception for the first time in his Book of Optics (1021).
Avicenna, who was a pioneer of experimental medicine and was also an influential thinker and medical scholar, wrote The Canon of Medicine (1025) and The Book of Healing (1027), which remained standard textbooks in both Muslim and European universities until at least the 17th century. Avicenna's contributions include the introduction of systematic experimentation and quantification into the study of physiology, the discovery of the contagious nature of infectious diseases, the introduction of quarantine to limit the spread of contagious diseases, the introduction of experimental medicine, evidence-based medicine, clinical trials,
randomized controlled trials,
efficacy tests,
and clinical pharmacology,
the importance of dietetics and the influence of climate and environment on health, the distinction of mediastinitis from pleurisy, the contagious nature of phthisis and tuberculosis, the distribution of diseases by water and soil, and the first careful descriptions of skin troubles, sexually transmitted diseases, perversions, and nervous ailments, as well the use of ice to treat fevers, and the separation of medicine from pharmacology, which was important to the development of the pharmaceutical sciences.
Ibn Zuhr (Avenzoar) is considered a pioneer of experimental surgery, for introducing the experimental method into surgery in the 12th century, as he was the first to employ animal testing in order to experiment with surgical procedures before applying them to human patients. He also performed the first dissections and postmortem autopsies on both humans as well as animals.
In 1242, Ibn al-Nafis, considered a pioneer of circulatory physiology, was the first to describe pulmonary circulation and coronary circulation, which form the basis of the circulatory system, for which he is considered one of the greatest physiologists in history. (cf. , Encyclopedia of Islamic World) He also described the earliest concept of metabolism, and developed new systems of physiology and psychology to replace the Avicennian and Galenic systems, while discrediting many of their erroneous theories on the four humours, pulsation, bones, muscles, intestines, sensory organs, bilious canals, esophagus, stomach, etc. Ibn al-Lubudi (1210-1267) rejected the theory of four humours supported by Galen and Hippocrates, discovered that the body and its preservation depend exclusively upon blood, rejected Galen's idea that women can produce sperm, and discovered that the movement of arteries are not dependent upon the movement of the heart, that the heart is the first organ to form in a fetus' body (rather than the brain as claimed by Hippocrates), and that the bones forming the skull can grow into tumors. (cf. Salah Zaimeche, , Foundation for Science Technology and Civilisation)
The Tashrih al-badan (Anatomy of the body) of Mansur ibn Ilyas (c. 1390) contained comprehensive diagrams of the body's structural, nervous and circulatory systems. During the Black Death bubonic plague in 14th century al-Andalus, Ibn Khatima and Ibn al-Khatib hypothesized that infectious diseases are caused by "contagious entities" which enter the human body. Other medical innovations first introduced by Muslim physicians include the discovery of the immune system, the use of animal testing, and the combination of medicine with other sciences (including agriculture, botany, chemistry, and pharmacology), as well as the invention of the injection syringe by Ammar ibn Ali al-Mawsili in 9th century Iraq, the first drugstores in Baghdad (754), the distinction between medicine and pharmacy by the 12th century, and the discovery of at least 2,000 medicinal and chemical substances.
Formal sciences
Logic
Early Islamic law placed importance on formulating standards of argument, which gave rise to a novel approach to logic in Kalam, but this approach was later influenced by ideas from Greek philosophy and Hellenistic philosophy with the rise of the Mu'tazili theologians, who highly valued Aristotle's Organon. The works of Hellenistic-influenced Islamic philosophers were crucial in the reception of Aristotelian logic in medieval Europe, along with the commentaries on the Organon by Averroes. The works of al-Farabi, Avicenna, al-Ghazali and other Muslim logicians who often criticized and corrected Aristotelian logic and introduced their own forms of logic, also played a central role in the subsequent development of medieval European logic.
Islamic logic not only included the study of formal patterns of inference and their validity but also elements of the philosophy of language and elements of epistemology and metaphysics. Due to disputes with Arabic grammarians, Islamic philosophers were very interested in working out the relationship between logic and language, and they devoted much discussion to the question of the subject matter and aims of logic in relation to reasoning and speech. In the area of formal logical analysis, they elaborated upon the theory of terms, propositions and syllogisms. They considered the syllogism to be the form to which all rational argumentation could be reduced, and they regarded syllogistic theory as the focal point of logic. Even poetics was considered as a syllogistic art in some fashion by many major Islamic logicians.
Important developments made by Muslim logicians included the development of "Avicennian logic" as a replacement of Aristotelian logic. Avicenna's system of logic was responsible for the introduction of hypothetical syllogism, temporal modal logic, and inductive logic. Other important developments in Islamic philosophy include the development of a strict science of citation, the isnad or "backing", and the development of a scientific method of open inquiry to disprove claims, the ijtihad, which could be generally applied to many types of questions. From the 12th century, despite the logical sophistication of al-Ghazali, the rise of the Asharite school in the late Middle Ages slowly limited original work on logic in the Islamic world, though it did continue into the 15th century.
Mathematics
John J. O'Connor and Edmund F. Robertson wrote in the MacTutor History of Mathematics archive:
Al-Khwarizmi (780-850), from whose name the word algorithm derives, contributed significantly to algebra, which is named after his book, Kitab al-Jabr, the first book on elementary algebra. He also introduced what is now known as Arabic numerals, which originally came from India, though Muslim mathematicians did make several refinements to the number system, such as the introduction of decimal point notation. Al-Kindi (801-873) was a pioneer in cryptanalysis and cryptology. He gave the first known recorded explanations of cryptanalysis and frequency analysis in A Manuscript on Deciphering Cryptographic Messages.
The first known proof by mathematical induction appears in a book written by Al-Karaji around 1000 AD, who used it to prove the binomial theorem, Pascal's triangle, and the sum of integral cubes. The historian of mathematics, F. Woepcke, praised Al-Karaji for being "the first who introduced the theory of algebraic calculus." Ibn al-Haytham was the first mathematician to derive the formula for the sum of the fourth powers, and using the method of induction, he developed a method for determining the general formula for the sum of any integral powers, which was fundamental to the development of integral calculus. The 11th century poet-mathematician Omar Khayyám was the first to find general geometric solutions of cubic equations and laid the foundations for the development of analytic geometry, algebraic geometry and non-Euclidean geometry. Sharaf al-Din al-Tusi (1135-1213) found algebraic and numerical solutions to cubic equations and was the first to discover the derivative of cubic polynomials, an important result in differential calculus.
Other achievements of Muslim mathematicians include the invention of spherical trigonometry, the discovery of all the trigonometric functions besides sine and cosine, early inquiry which aided the development of analytic geometry by Ibn al-Haytham, the first refutations of Euclidean geometry and the parallel postulate by Nasir al-Din al-Tusi, the first attempt at a non-Euclidean geometry by Sadr al-Din, the development of symbolic algebra by Abu al-Hasan ibn Ali al-Qalasadi, and numerous other advances in algebra, arithmetic, calculus, cryptography, geometry, number theory and trigonometry.
Natural sciences
Astrology
Islamic astrology, in Arabic ilm al-nujum is the study of the heavens by early Muslims. In early Arabic sources, ilm al-nujum was used to refer to both astronomy and astrology. In medieval sources, however, a clear distinction was made between ilm al-nujum (science of the stars) or ilm al-falak (science of the celestial orbs), referring to astrology, and ilm al-haya (science of the figure of the heavens), referring to astronomy. Both fields were rooted in Greek, Persian, and Indian traditions. Despite consistent critiques of astrology by scientists and religious scholars, astrological prognostications required a fair amount of exact scientific knowledge and thus gave partial incentive for the study and development of astronomy.
The first semantic distinction between astronomy and astrology was given by al-Biruni in the 11th century, though he himself refuted the study of astrology. 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 both due to the methods used by astrologers being conjectural rather than empirical and also due to the views of astrologers conflicting with orthodox Islam.
Astronomy
In astronomy, the works of Egyptian/Greek astronomer Ptolemy, particularly the Almagest, and the Indian work of Brahmagupta, were significantly refined over the years by Muslim astronomers. The astronomical tables of Al-Khwarizmi and of Maslamah Ibn Ahmad al-Majriti served as important sources of information for Latinized European thinkers rediscovering the works of astronomy, where extensive interest in astrology was discouraged.
In the 11th century, Muslim astronomers began questioning the Ptolemaic system, beginning with Ibn al-Haytham, and they were the first to conduct elaborate experiments related to astronomical phenomena, beginning with Abu al-Rayhan al-Biruni's introduction of the experimental method into astronomy. Many of them made changes and corrections to the Ptolemaic model and proposed alternative non-
Ptolemaic models within a geocentric framework. In particular, the corrections and critiques of al-Battani, Ibn al-Haytham, and Averroes, and the non-Ptolemaic models of the Maragha astronomers, Nasir al-Din al-Tusi (Tusi-couple), Mo'ayyeduddin Urdi (Urdi lemma), and Ibn al-Shatir, were later adapted into the heliocentric Copernican model, and that Copernicus' arguments for the Earth's rotation were similar to those of al-Tusi and Ali al-Qushji. Some have referred to the achievements of the Maragha school as a "Maragha Revolution", "Maragha School Revolution", or "Scientific Revolution before the Renaissance".
Other contributions from Muslim astronomers include Biruni speculating that the Milky Way galaxy is a collection of numerous nebulous stars, the development of a planetary model without any epicycles by Ibn Bajjah (Avempace), the development of universal astrolabes, the invention of numerous other astronomical instruments, continuation of inquiry into the motion of the planets, Ja'far Muhammad ibn Musa ibn Shakir's discovery that the heavenly bodies and celestial spheres are subject to the same physical laws as Earth,
the first elaborate experiments related to astronomical phenomena and the first semantic distinction between astronomy and astrology by Abu al-Rayhan al-Biruni,
the use of exacting empirical observations and experimental techniques,
the discovery that the celestial spheres are not solid and that the heavens are less dense than the air by Ibn al-Haytham,
the separation of natural philosophy from astronomy by Ibn al-Haytham and al-Qushji,
the rejection of the Ptolemaic model on empirical rather than philosophical grounds by Ibn al-Shatir,
and the first empirical observational evidence of the Earth's rotation by al-Tusi and al-Qushji. Several Muslim astronomers also discussed the possibility of a heliocentric model with elliptical orbits, such as Ja'far ibn Muhammad Abu Ma'shar al-Balkhi, Ibn al-Haytham, Abu al-Rayhan al-Biruni, al-Sijzi, 'Umar al-Katibi al-Qazwini, and Qutb al-Din al-Shirazi.
Chemistry
The 9th century chemist, Geber (Jabir ibn Hayyan), is considered a pioneer of chemistry, for introducing an early experimental method for chemistry, as well as the alembic, still, retort, pure distillation, liquefaction, crystallisation, purification, oxidisation, evaporation, and filtration.
Al-Kindi was the first to refute the study of traditional alchemy and the theory of the transmutation of metals, followed by Abu Rayhan al-Biruni, Avicenna, and Ibn Khaldun. Avicenna also invented steam distillation and produced the first essential oils, which led to the development of aromatherapy. Razi first distilled petroleum, invented kerosene and kerosene lamps, soap bars and modern recipes for soap, and antiseptics. In his Doubts about Galen, al-Razi was also the first to prove both Aristotle's theory of classical elements and Galen's theory of humorism wrong using an experimental method. In the 13th century, Nasir al-Din al-Tusi stated an early version of the law of conservation of mass, noting that a body of matter is able to change, but is not able to disappear.
Will Durant wrote in The Story of Civilization IV: The Age of Faith:
George Sarton wrote in the Introduction to the History of Science:
Earth sciences
Muslim scientists made a number of contributions to the Earth sciences. Alkindus was the first to introduce experimentation into the Earth sciences. Biruni is considered a pioneer of geodesy for his important contributions to the field, along with his significant contributions to geography and geology.
Among his writings on geology, Biruni wrote the following on the geology of India:
John J. O'Connor and Edmund F. Robertson write in the MacTutor History of Mathematics archive:
Fielding H. Garrison wrote in the History of Medicine:
George Sarton wrote in the Introduction to the History of Science:
In geology, Avicenna hypothesized on two causes of mountains in The Book of Healing (1027) and developed the law of superposition and concept of uniformitarianism. In cartography, the Piri Reis map drawn by the Ottoman cartographer Piri Reis in 1513, was one of the earliest world maps to include the Americas, and perhaps the first to include Antarctica. His map of the world was considered the most accurate in the 16th century.
The earliest known treatises dealing with environmentalism and environmental science, especially pollution, were Arabic treatises written by al-Kindi, al-Razi, Ibn Al-Jazzar, al-Tamimi, al-Masihi, Avicenna, Ali ibn Ridwan, Abd-el-latif, and Ibn al-Nafis. Their works covered a number of subjects related to pollution such as air pollution, water pollution, soil contamination, municipal solid waste mishandling, and environmental impact assessments of certain localities. Cordoba, al-Andalus also had the first waste containers and waste disposal facilities for litter collection. F. B. Artz (1980), The Mind of the Middle Ages, Third edition revised, University of Chicago Press, pp 148-50.
(cf. , 1001 Inventions)
Physics
In the optics field of physics, Ibn Sahl (c. 940-1000), a mathematician and physicist connected with the court of Baghdad, wrote a treatise On Burning Mirrors and Lenses in 984 in which he set out his understanding of how curved mirrors and lenses bend and focus light. Ibn Sahl is now credited with first discovering the law of refraction, usually called Snell's law. He used this law to work out the shapes of lenses that focus light with no geometric aberrations, known as anaclastic lenses.
Ibn al-Haytham (Alhazen) (965-1039), who is considered a pioneer of optics and the scientific method, developed a broad theory of light and optics in his Book of Optics which explained vision, using geometry and anatomy, and stated that each point on an illuminated area or object radiates light rays in every direction, but that only one ray from each point, which strikes the eye perpendicularly, can be seen. The other rays strike at different angles and are not seen. He used the example of the camera obscura and pinhole camera, which produces an inverted image, to support his argument. This contradicted Ptolemy's theory of vision that objects are seen by rays of light emanating from the eyes. Alhacen held light rays to be streams of minute particles that travelled at a finite speed. He improved accurately described the refraction of light, and discovered the laws of refraction. He dealt at length with the theory of various physical phenomena like shadows, eclipses, and the rainbow. He also attempted to explain binocular vision and the moon illusion. Through these extensive researches on optics, he is considered a pioneer of modern optics. His Book of Optics was later translated into Latin, and has been ranked alongside Isaac Newton's Philosophiae Naturalis Principia Mathematica as one of the most influential books in the history of physics, for initiating a revolution in optics and visual perception.
Avicenna (980-1037) agreed that the speed of light is finite, as he "observed that if the perception of light is due to the emission of some sort of particles by a luminous source, the speed of light must be finite." Abu Rayhan al-Biruni (973-1048) also agreed that light has a finite speed, and he was the first to discover that the speed of light is much faster than the speed of sound. Qutb al-Din al-Shirazi (1236-1311) and Kamal al-Din al-Farisi (1260-1320) gave the first correct explanations for the rainbow phenomenon.
In mechanics, Ja'far Muhammad ibn Musa ibn Shakir (800-873) of the Banu Musa hypothesized that heavenly bodies and celestial spheres were subject to the same laws of physics as Earth, and in his Astral Motion and The Force of Attraction, he also hypothesized that there was a force of attraction between heavenly bodies. Abu Rayhan al-Biruni (973-1048), and later al-Khazini, developed experimental scientific methods for mechanics, especially the fields of statics and dynamics, particularly for determining specific weights, such as those based on the theory of balances and weighing. Muslim physicists unified statics and dynamics into the science of mechanics, and they combined the fields of hydrostatics with dynamics to give birth to hydrodynamics. They applied the mathematical theories of ratios and infinitesimal techniques, and introduced algebraic and fine calculation techniques into the field of statics. They were also generalized the theory of the centre of gravity and applied it to three-dimensional bodies. They also founded the theory of the ponderable lever and created the "science of gravity" which was later further developed in medieval Europe. Al-Biruni also theorized that acceleration is connected with non-uniform motion.
In mechanics, Ibn al-Haytham discussed the theory of attraction between masses, and it seems that he was aware of the magnitude of acceleration due to gravity, and he stated that the heavenly bodies "were accountable to the laws of physics". Ibn al-Haytham also enunciated the law of inertia when he stated that a body moves perpetually unless an external force stops it or changes its direction of motion. He also developed the concept of momentum, though he did not quantify this concept mathematically. Avicenna (980-1037) developed the concept of momentum, referring to impetus as being proportional to weight times velocity. His theory of motion was also consistent with the concept of inertia in classical mechanics.
In 1121, al-Khazini, in The Book of the Balance of Wisdom, proposed that the gravity and gravitational potential energy of a body varies depending on its distance from the centre of the Earth, and in statics, he clearly differentiated between force, mass and weight. Avempace (d. 1138) argued that there is always a reaction force for every force exerted,(cf. Abel B. Franco (October 2003), "Avempace, Projectile Motion, and Impetus Theory", Journal of the History of Ideas 64 (4): 521-546 [543]) though he did not refer to the reaction force as being equal to the exerted force. His theory of motion had an important influence on later physicists like Galileo Galilei. Hibat Allah Abu'l-Barakat al-Baghdaadi (1080-1165) wrote a critique of Aristotelian physics entitled al-Mu'tabar, where he negated Aristotle's idea that a constant force produces uniform motion, as he theorized that a force applied continuously produces acceleration.(cf. Abel B. Franco (October 2003). "Avempace, Projectile Motion, and Impetus Theory", Journal of the History of Ideas 64 (4), p. 521-546 [528].) He also described acceleration as the rate of change of velocity. Averroes (1126–1198) defined and measured force as "the rate at which work is done in changing the kinetic condition of a material body" and correctly argued "that the effect and measure of force is change in the kinetic condition of a materially resistant mass." In the early 16th century, al-Birjandi developed a hypothesis similar to "circular inertia." The Muslim developments in mechanics laid the foundations for the later development of classical mechanics in early modern Europe.
Zoology
In the zoology field of biology, Muslim biologists developed theories on evolution which were widely taught in medieval Islamic schools. John William Draper, a contemporary of Charles Darwin, considered the "Mohammedan theory of evolution" to be developed "much farther than we are disposed to do, extending them even to inorganic or mineral things." According to al-Khazini, ideas on evolution were widespread among "common people" in the Islamic world by the 12th century.
The first Muslim biologist to develop a theory on evolution was al-Jahiz (781-869). He wrote on the effects of the environment on the likelihood of an animal to survive, and he first described the struggle for existence. Al-Jahiz was also the first to discuss food chains,
and was also an early adherent of environmental determinism, arguing that the environment can determine the physical characteristics of the inhabitants of a certain community and that the origins of different human skin colors is the result of the environment.
Ibn al-Haytham wrote a book in which he argued for evolutionism (although not natural selection), and numerous other Islamic scholars and scientists, such as Ibn Miskawayh, the Brethren of Purity, al-Khazini, Abu Rayhan al-Biruni, Nasir al-Din Tusi, and Ibn Khaldun, discussed and developed these ideas. Translated into Latin, these works began to appear in the West after the Renaissance and appear to have had an impact on Western science.
Ibn Miskawayh's al-Fawz al-Asghar and the Brethren of Purity's Encyclopedia of the Brethren of Purity (The Epistles of Ikhwan al-Safa) expressed evolutionary ideas on how species evolved from matter, into vapor, and then water, then minerals, then plants, then animals, then apes, and then humans. These works were known in Europe and likely had an influence on Darwinism.
Social sciences
Sociology and Anthropology
Significant contributions were made to the social sciences in the Islamic civilization. Abu al-Rayhan al-Biruni (973-1048) has been described as "the first anthropologist". He wrote detailed comparative studies on the anthropology of peoples, religions and cultures in the Middle East, Mediterranean and South Asia. Biruni's anthropology of religion was only possible for a scholar deeply immersed in the lore of other nations.
Biruni has also been praised by several scholars for his Islamic anthropology. Biruni is also considered a pioneer of Indology. Al-Saghani (died 990) wrote some of the earliest comments on the history of science, which included a comparison between the more theoretical approach of the "ancients" (including the ancient Egyptians, Babylonians, Greeks and Indians) to that of the more experimental approach of the "modern scholars" (the Muslim scientists of his time). Al-Muqaddasi (b. 945) also made contributions to the social sciences.
Ibn Khaldun (1332-1406) is considered a forerunner of several social sciences such as demography, cultural history, historiography, the philosophy of history, sociology, and economics. He is best known for his Muqaddimah (Latinized as Prolegomenon). Some of the ideas he introduced in the Muqaddimah include social philosophy, social conflict theories, social cohesion, social capital, social networks, dialectics, the Laffer curve, the historical method, systemic bias, the rise and fall of civilizations, feedback loops, systems theory, and corporate social responsibility. He also introduced the scientific method into the social sciences.
Franz Rosenthal wrote in the History of Muslim Historiography:
Psychology
"Islamic psychology" or Ilm-al Nafsiat refers to the study of the Nafs ("self" or "psyche") in the Islamic world and encompassed a "broad range of topics including the qalb (heart), the ruh (spirit), the aql (intellect) and irada (will)." Al-Kindi (Alkindus) was the first to experiment with music therapy, and Ali ibn Sahl Rabban al-Tabari was the first to practice al-‘ilaj al-nafs ("psychotherapy"). The concepts of al-tibb al-ruhani ("spiritual health | |
