Moon
1. The natural satellite of Earth, visible by reflection of sunlight and
having a slightly elliptical orbit, approximately 356,000 kilometers (221,600
miles) distant at perigee and 406,997 kilometers (252,950 miles) at apogee. Its
mean diameter is 3,475 kilometers (2,160 miles), its mass approximately one
eightieth that of Earth, and its average period of revolution around Earth 29
days 12 hours 44 minutes calculated with respect to the sun. American men have
landed on the moon.
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Shown is the moon shining through some trees |