The synodic month is
A) about two days shorter than the sidereal month.
B) based on the Moon's position relative to the stars.
C) caused by both the Earth's and Moon's rotations.
D) 29.5 days.
E) the basis of the year we use in our modern calendar.

Question

Quizplus · Accepted Answer

The synodic month, which is about 29.5 days, is the time it takes for the Moon to return to the same phase (e.g., full moon to full moon). This differs from the sidereal month, which is based on the Moon's position relative to the stars and is about 27.3 days long. The synodic month is longer because as the Earth moves around the Sun, the Moon needs to travel a bit further to complete its phase cycle.

The Synodic Month Is