The Moon.
Click on image for full size
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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