The sidereal month is the time required for
A)The Moon to go from new phase to new phase
B)The Moon to orbit the Earth once with respect to the sun
C)The Moon to orbit the Earth once with respect to the stars
D)A complete saros cycle

Question

Quizplus · Accepted Answer

The sidereal month is the time required for the Moon to orbit the Earth once with respect to the stars. This is because the Moon's motion is not only influenced by the Earth's gravitational pull but also by the revolution of the Earth around the Sun. As a result, it takes slightly longer for the Moon to return to the same position with respect to the stars than it does with respect to the Sun. The sidereal month is roughly 27.3 days long.

The Sidereal Month Is the Time Required for