Heliocentric vs. Geocentric Viewpoints
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Determine the time it takes for Venus to make one trip around the Sun in years.
Determine the time it takes for Mars to make one trip around the Sun in years.
How does the number of epicycles Jupiter makes compare to the the number of epicycles Mars makes?  Explain in one or two sentences.
Using the geocentric model, what would one 'year' be defined as for Mars?   Would it be the same or different than the heliocentric model?  Why?
An earth year means that, among other things, that the Sun  touches all of the Zodiac constellations.  How could this information help us in determining the length of a Mars year?
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