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Moon Month

The Moon phases
Credit: Rafolas

As the Moon orbits around the Earth, the Sun shines on it from different directions. This makes the Moon appear to change shape during its 29.5 day full cycle. This is actually a little longer than the Moon takes to orbit once around the Earth (around 27 days) due to the fact that the Earth is also moving around the Sun at the same time.

We call these changes the Phases of the Moon.