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 Dez 781 Jahr v. Chr. – 1 Jun 773 Jahr v. Chr.)
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1 Dez 781 Jahr v. Chr.
1 Jun 773 Jahr v. Chr.
~ 8 years and 6 months