Habash al-Hasib

Habash al-Hasib

(häbäsh` äl-häsēb`), 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.
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He then narrows the list to two prime suspects, the tenth-/eleventh-century polymath al-Biruni and the clever mathematician and astronomer of the ninth and tenth centuries, Habash al-Hasib.