Question

why does the moon look as it is changing its shape

Answer 1

The Moon appears to change shapebecause we see different amounts of the lit part as the Moon orbits Earth. When the Moon is between Earth and the Sun, the lit side is hidden from us. As it moves around Earth, more and more of the lit side comes into view. ... It takes 29.5 days for the Moon to orbit Earth.

Answer 2

Moon never changes it's shape. it from our point of view that we feel like the moon is changing it's shape actually what we see are the different phases of moon when the moon moves in a circular orbit and with respect to our position we see different phases of moon.......

hope it's useful