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Why did Ptolemy have the planets orbiting Earth on circles upon circles in his model of the Universe?

This question is part of This Quiz on Astronomy is only for geniuses
Asked by Moonshark, Last updated: Feb 26, 2020

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moonshark

Moonshark

Answered Jun 07, 2019

To explain the fact that planets sometimes appear to move westward, rather than eastward, relative to the stars in our sky
 

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