Question

Why there is a difference of nearly 2 days 5 hours between sidereal month and synodic month of the moon?

Answer 1

However, because the Earth is constantly moving along its orbit about the Sun, the Moonmust travel slightly more than 360° to get from one newmoon to the next. Thus, thesynodic month, or lunar month, is longer than thesidereal month. A sidereal month lasts 27.322 days, while a synodic month lasts 29.531days.