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Topic: **Astrology**

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# Abū Rayhān Bīrūnī -- Medieval Islamic Scientist, quite a read...

**Abu Rayhan al-Biruni** (973 – after 1050)
was a Persian scholar and polymath. He was from Khwarazm – a region which encompasses modern-day western Uzbekistan, and northern Turkmenistan.

Al-Biruni was well versed in physics, mathematics, astronomy, and natural sciences, and also distinguished himself as a historian, chronologist and linguist. He studied almost all fields of science and was compensated for his research and strenuous work. Royalty and powerful members of society sought out Al-Biruni to conduct research and study to uncover certain findings. He lived during the Islamic Golden Age. In addition to this type of influence, Al-Biruni was also influenced by other nations, such as the Greeks, who he took inspiration from when he turned to studies of philosophy. He was conversant in Khwarezmian, Persian, Arabic, Sanskrit, and also knew Greek, Hebrew and Syriac. He spent much of his life in Ghazni, then capital of the Ghaznavid dynasty, in modern-day central-eastern Afghanistan. In 1017 he travelled to the Indian subcontinent and authored a study of Indian culture *Tārīkh al-Hind* (History of India) after exploring the Hindu faith practiced in India. He was given the title "founder of Indology". He was an impartial writer on customs and creeds of various nations, and was given the title *al-Ustadh* ("The Master") for his remarkable description of early 11th-century India.

### Discussed on

- "Abū Rayhān Bīrūnī -- Medieval Islamic Scientist, quite a read... " | 2008-09-15 | 55 Upvotes 50 Comments

# Muhammad ibn Musa al-Khwarizmi

**Muḥammad ibn Mūsā al-Khwārizmī** (Persian: Muḥammad Khwārizmī محمد بن موسی خوارزمی; c. 780 – c. 850), Arabized as al-Khwarizmi with al- and formerly Latinized as *Algorithmi*, was a Persian polymath who produced works in mathematics, astronomy, and geography. Around 820 CE he was appointed as the astronomer and head of the library of the House of Wisdom in Baghdad.

Al-Khwarizmi's popularizing treatise on algebra (*The Compendious Book on Calculation by Completion and Balancing*, c. 813–833 CE) presented the first systematic solution of linear and quadratic equations. One of his principal achievements in algebra was his demonstration of how to solve quadratic equations by completing the square, for which he provided geometric justifications. Because he was the first to treat algebra as an independent discipline and introduced the methods of "reduction" and "balancing" (the transposition of subtracted terms to the other side of an equation, that is, the cancellation of like terms on opposite sides of the equation), he has been described as the father or founder of algebra. The term *algebra* itself comes from the title of his book (specifically the word *al-jabr* meaning "completion" or "rejoining"). His name gave rise to the terms *algorism* and *algorithm*. His name is also the origin of (Spanish) *guarismo* and of (Portuguese) *algarismo*, both meaning digit.

In the 12th century, Latin translations of his textbook on arithmetic (*Algorithmo de Numero Indorum*) which codified the various Indian numerals, introduced the decimal positional number system to the Western world. *The Compendious Book on Calculation by Completion and Balancing*, translated into Latin by Robert of Chester in 1145, was used until the sixteenth century as the principal mathematical text-book of European universities.

In addition to his best-known works, he revised Ptolemy's *Geography*, listing the longitudes and latitudes of various cities and localities. He further produced a set of astronomical tables and wrote about calendaric works, as well as the astrolabe and the sundial. He also made important contributions to trigonometry, producing accurate sine and cosine tables, and the first table of tangents.

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- "Muhammad ibn Musa al-Khwarizmi" | 2016-04-06 | 14 Upvotes 1 Comments