Thābit ibn Qurra

▪ Arab mathematician, physician, and philosopher
in full  Al-Ṣābi' Thābit ibn Qurra al-Ḥarrānī 
born c. 836, , Syria
died 901, Baghdad, Iraq

      Arab mathematician, astronomer, physician, and philosopher, a representative of the flourishing Arab-Islamic culture of the 9th century.

      Thābit was a scion of a prominent family settled in Ḥarrān (Harran), a city noted as the seat of a Hellenized Semitic astronomical cult of which Thābit was a member. By calling themselves Sabians, after a group mentioned in the Qur'ān (Qurʾān), the cult members established themselves as “People of the Book” and hence were freed from the requirement of conversion to Islam. Some sources describe Thābit as a money changer in Ḥarrān, and, although the sources give two different accounts of his life, both agree that he went to Baghdad to work for three wealthy brothers, known as the Banū Mūsā, translating Greek mathematical texts. Among the major Greek mathematicians whose works he translated (or whose translations he revised) were Euclid, Archimedes, Apollonius of Perga, and Ptolemy. He also prepared summaries of the works of the physicians Galen Of Pergamum and Hippocrates as well as the philosophy of Aristotle. He soon wrote original works on geometry, statics, magic squares (magic square), the theory of numbers, music, astronomy, medicine, and philosophy.

      Through the influence of the mathematician Muḥammad ibn Mūsā ibn Shākir (father of the three famous Banū Mūsā mathematician brothers), late in his life Thābit ibn Qurrah became court astronomer for the ʿAbbāsid (Abbāsid Dynastyʿ) caliph al-Muʿtaḍid (Muʿtaḍid, al-) (reigned 892–902).

      Several of Thābit ibn Qurrah's works were translated into Latin and Hebrew and proved to be influential in the Latin West. A son, Sinān ibn Thābit, became a renowned physician and director of a hospital in Baghdad, and a grandson, Ibrāhīm ibn Sinān, won fame as an important mathematician.

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