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Ptolemy Improved the Geocentric Model By – Astronomy Homework Help

Ptolemy Improved the Geocentric Model By – Astronomy Homework Help
Ptolemy improved the geocentric model by

A) changing the circles to ellipses

B) moving the Sun to the center

C) adding epicycles and deferents

D) adding crystalline spheres

 

Ptolemy improved upon the idea of the geocentric model by assuming that each planet moved in a small circle while in orbit. The small circles were called epicycles and were incorporated so as to explain retrograde motion. Ultimately, there were too many discrepancies in this idea, and it ultimately collapsed to the principal of a heliocentric solar system.
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