Habash al-Hasib , d. c.870, Arab mathematician and astronomer. Habash al-Hasib was born in what is now Mary, Turkmenistan, and worked in Baghdad. He calculated tables of sines, tangents, and standard astronomical functions. He found formulas for calculating the positions and orbits of celestial bodies that go beyond the Ptolemaic theory on which they are based.
Author not available, HABASH AL-HASIB.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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