4 keys to understanding moon phases

4 keys to understanding moon phases

As seen from the north side of the moon’s orbital plane, the Earth rotates or spins counterclockwise. And the moon revolves counterclockwise around Earth. The moon’s changing position with respect to the sun is what causes the moon phases we see in our sky. Not to scale. Image via NASA/ Wikimedia Commons. Moon phases change shape every day Why does the moon seem to change its shape every night? It’s because the moon is a world in space, just as …