Question: what is the difference between the moon sidereal period and its synodic period?
Answer: The sidereal month is the time the Moon takes to complete one full revolution around the Earth with respect to the background stars. ... Thus, the synodic month, or lunar month, is longer than the sidereal month. A sidereal month lasts 27.322 days, while a synodic month lasts 29.531 days.