The Moon.
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NASA.

Motion of the Moon

The Moon is one of the largest objects in our sky. You may not notice the moon much. In fact, many people don't realize that you can see the moon both during the night and during the day, depending on its phase..

Yet the moon is very important to us. Even though it is small, it is close to us and it's gravity causes the ocean tides. We use its orbit to define a unit of time: the month.

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