In Ptolemy's Theory, Retrograde Planetary Motion Is Explained as

question 51

Multiple Choice

In Ptolemy's theory, retrograde planetary motion is explained as

• A) a result of Earth's motion: as Earth passes another planet, that planet appears to move backward as seen against the background stars.
• B) due to the natural wandering of the celestial sphere of background stars.
• C) the backward part of the planet's loop- the- loop orbits around Earth.
• D) due to the back- and- forth or "oscillatory" motion that planets make as they move along their circular orbits around Earth.
• E) Actually he didn't have an explanation for this.

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