Select the correct answer. What do astronomers refer to as the retrograde motion of the planets?
O A. apparent movement of the planets eastward in a single night
B. apparent movement of the planets westward in a single night
C. apparent movement of the planets eastward from night to night
OD. apparent movement of the planets westward from night to night
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Explanation:

Close encounters tend to disrupt orbits. So that is retrograde motion. Astronomers use the term to refer to the occasional backwards motion of the planets as seen in Earth's sky. When used in this way, retrograde motion is entirely an illusion caused by the moving Earth passing the outer planets in their orbits.

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