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apr 13, 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).

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HPS Project

Byjerbyromero
28 Sep 2017
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Date:

apr 13, 1118
Now
~ 908 years ago

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