According to Copernicus, the retrograde motion for Mars must occur
A) at greatest elongation, when Mars can get up to 47 degrees from the Sun.
B) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun.
C) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.
D) at superior conjunction, when Mars lies on the far side of the Sun.
E) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun.
Correct Answer:
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