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10-06-2017
Physics

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The primary purpose of describing planetary orbits in terms of epicycles and deferents was to account for the

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egenriether egenriether

10-06-2017

Retrograde. Planets seem to move forward and then backward sometimes. This is really because we pass them as we move in our orbit but astronomers wanted to try to describe the solar system with earth at the center so elaborate models were employed.

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