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

Question

Quizplus · Accepted Answer

In Copernicus's heliocentric model, retrograde motion is explained by Earth's motion. As Earth overtakes another planet in its orbit, the planet appears to move backward against the background stars.

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