The amount of time a planet takes to orbit the Sun is called its _________ period.
A) synodic
B) sidereal
C) prograde
D) retrograde
E) geocentric

Question

Quizplus · Accepted Answer

Sidereal period is the amount of time a planet takes to complete one full orbit around the Sun measured with respect to the fixed stars. Synodic period, on the other hand, is the time it takes for the planet to return to the same apparent position in the sky as viewed from Earth. Prograde and retrograde refer to the direction of motion of a planet relative to the Sun, and geocentric refers to the belief that the Earth is the center of the universe.

The Amount of Time a Planet Takes to Orbit the Sun