January 2009
American Heritage Student Science Dictionary;2009, p229
Reference Entry
Several definitions of the term "moon" are presented. (1) A natural satellite of Earth, visible by reflection of sunlight and traveling around Earth in a slightly elliptical orbit at an average distance of about 237,000 miles. (2) A natural satellite revolving around a planet: the moons of Jupiter. (3) A particular time in its cycle of phases: a half moon. INSET: moons.


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