Phases of the Moon simulator

Move through the lunar month to see the Sun lighting half of the Moon, and how much of that lit half you can see from Earth, with when to look.

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Questions students ask

Why does the Moon have phases?

The Sun always lights half of the Moon. As the Moon orbits Earth we see different amounts of that lit half.

How long is the cycle of phases?

About 29.5 days, from new moon to new moon.

Free notes on phases of the moon

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