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jan 1, 140 - Ptolemy: Geocentric; introducing deferents and epicycles to describe Retrograde motion with 80 circles; failed to predict Mars' motion.
Added to timeline:
Astronomy History
By
陈瀚可 Koke Cacao
7 Nov 2019
0
0
270
Date:
jan 1, 140
Now
~ 1886 years ago
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