The length of time for the Moon to move from new Moon to new Moon is known as 1 synodic month. Compared to one full orbital period with respect to the star background, or 1 sidereal month, the synodic month is
A) about 2 days shorter.
B) about twice as long.
C) exactly the same length.
D) about 2 days longer.

Question

Quizplus · Accepted Answer

The synodic month is about 2 days longer than the sidereal month because it accounts for the Earth's movement around the Sun, requiring the Moon to travel a bit further to align again in the same phase as observed from Earth.

The Length of Time for the Moon to Move from New