Habash alHasibHabash alHasib (häbäshˈ älhäsēbˈ) [key], d. c.870, Arab mathematician and astronomer. Habash alHasib 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. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved. More on Habash alHasib from Fact Monster:
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