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The apparent changes in the moon's shape are called waxing and waning. The moon is waxing when it goes from a new moon (you can't see it) to a full moon and it is waning as it goes from a full moon to a new moon.

What appears to us as a change in shape is caused by the position of the moon with respect to the Earth and the sun. When the Earth is completely between the moon and the sun, no light is able to hit the moon and we see a new moon. When the Earth is partially between the sun and the moon. Lastly, when the Earth is not between the sun and the moon, we see a full moon.

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14y ago

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