25
/
en
AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
January 31, 2021
3496408
317660
1

jan 1, 140 - Ptolemy: Geocentric; introducing deferents and epicycles to describe Retrograde motion with 80 circles; failed to predict Mars' motion.

Added to timeline:

7 Nov 2019
0
0
24
Astronomy History

Date:

jan 1, 140
Now
~ 1882 years ago
PayPal - The safer, easier way to pay online!logo
About & FeedbackTermsPrivacy