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In Ptolemy's System the Planets Orbit the Earth and Not

Question 29

Multiple Choice

In Ptolemy's system the planets orbit the Earth and not the Sun. How did the system explain the retrograde motion of planets like Jupiter?


A) the planets were not moving along the ecliptic but all over the celestial sphere
B) the planets moved in very elongated ellipses, and their speed in orbit changed radically over the course of a year
C) the Sun moved among the planets, and pulled them out of their circular orbits
D) the planets moved on a small circle whose center, in turn, circled a point near the Earth
E) you can't fool me, Ptolemy's system did not include ANY explanation of retrograde motion _________________________________________________________________________
2) 3 Astrology and Astronomy

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