Abū Sahl al-Qūhī

transl|ar|ALA|Abū Sahl Wayjan ibn Rustam al-Qūhī (sometimes transl|ar|ALA|al-Kūhī), was a Persian [ [http://adsabs.harvard.edu/abs/2000eaa..bookE3410. al-Quhi, Abu Sahl Wayjan ibn Rustam (c. 940-c. 1000) ] ] mathematician, physicist and astronomer. Quhi was from Kuh (or Quh), an area in Tabaristan, and flourished in Baghdad in the 10th century. He is considered one of the greatest Muslim geometers.

Many mathematical and astronomical writings are ascribed to him. He was the leader of the astronomers working in 988 AD at the observatory built by the Buwayhid Sharaf al-Dawla. He devoted his attention to those Archimedean and Apollonian problems leading to equations higher than the second degree. He solved some of them and discussed the conditions of solvability.

In physics, al-Quhi discovered that the heaviness of bodies vary with their distance from the center of the Earth. [Professor Mohammed Abattouy (2002), "The Arabic Science of weights: A Report on an Ongoing Research Project", "The Bulletin of the Royal Institute for Inter-Faith Studies" 4, p. 109-130:quote|"For their parts, al-Quhi and Ibn al-Haytham had the priority in formulating the hypothesis that the heaviness of bodies vary with their distance from a specific point, the center of the earth."]

Notes

References

* Reviews: Seyyed Hossein Nasr (1998) in "Isis" 89 (1) pp. [http://links.jstor.org/sici?sici=0021-1753%28199803%2989%3A1%3C112%3AFR%3E2.0.CO%3B2-C 112-113] ; Charles Burnett (1998) in "Bulletin of the School of Oriental and African Studies, University of London" 61 (2) p. [http://links.jstor.org/sici?sici=0041-977X%281998%2961%3A2%3C406%3ALMIDIA%3E2.0.CO%3B2-K 406] .
* M. Steinschnieder, "Lettere intorno ad Alcuhi a D. Bald". Boncompagni (Roma, 1863)
* Suter, "Die Mathematiker und Astronomen der Araber" (75-76, 1900).
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