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. (1 dic 781 año aC – 1 jun 773 año aC)
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1 dic 781 año aC
1 jun 773 año aC
~ 8 years and 6 months