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.
Yet the Moon has a daily influence on our lives. Even though it is
small, it is close to us and its gravity causes the ocean tides. We use its orbit to
define a fundamental unit of time for us: the month. And its phases continually remind us of the ongoing
circle dance of the Earth, Moon, and the Sun.
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