Muhammad ibn Musa al-Khwarizmi 780 C 1.) He compiled astronomical tables (Zij) based on Hindu and Greek sources like calculating the positions of the sun, moon and planets and predicting eclipses. 2.) He introduced algebra and Hindu Arabic numerals. 3.) He used geometry to make astronomical calculations about the movement of planets and stars. (dec 1, 781 BC – jun 1, 773 BC)
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dec 1, 781 BC
jun 1, 773 BC
~ 8 years and 6 months