page 40 of textbook
page 41 of textbook

Points to Notice:

  1. First, the moon always keeps the same side facing Earth, and you never see the far side of the moon. “The man in the moon” is produced by the familiar features on the moon’s near side.
  2. Second, the changing shape of the moon as it passes through its cycle of phases is produced by sunlight illuminating different parts of the side of the moon you can see.
  3. The third thing to notice is the difference between the orbital period of the moon around Earth and the length of the lunar phase cycle. That difference is a good illustration of how your view from Earth is produced by the combined motions of Earth and other heavenly bodies such as the sun and moon.