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According to Kepler's model of the solar system, what is retrograde motion is caused by?

Question 10Select one:

a.
the Earth's rotation.


b.
epicycles.


c.
the daily turning of the celestial sphere.


d.
the difference in orbital speed of Earth and other planets.


e.
the changing speed of the Sun.

User Kasimir
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1 Answer

5 votes
The correct answer is D.
User Ricb
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