The Moon orbits Earth. This orbit causes the Moon to look different over the course of about a month. These differences are called phases. One phase is called a full moon. Look closely at the table to the right. What can you conclude about a full moon? A. A. A full moon only occurs in the summer months. B. B. A full moon always occurs after a first quarter moon. C. C. A full moon always occurs on the 5th day of the month. D. D. A full moon always occurs before the first quarter moon.