The Moon.
Click on image for full size
NASA.
Motion of the Moon
The
Moon is one of the
largest celestial objects in our sky. We are so accustomed to its
motions that it may go unnoticed for long periods of time. Many
people are unaware that the Moon is visible during the day at certain
times, depending on its
phase.
Yet the Moon has a daily influence on our lives. 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 fundamental unit of time for us: the month.
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