13 avr. 1118 - Persian polymath Omar Khayyam
Description:
demonstrates that the universe is not moving around Earth, but that the Earth revolves on its axis, bringing into view different star constellations throughout the night and day. He also calculated the solar year as 365.24219858156 days (correct to six decimal places).Ajouté au bande de temps:
Date:
13 avr. 1118
Maintenaint
~ Il y a 907 ans