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The moon's diameter is 2,159 miles (3,475 kilometers) and its circumference is 6,790 miles (10,864 kilometers). The moon is 27 percent the size of the Earth.
Sources: Gailey, Rosemary E. Moonscapes, p. 9; The New Encyclopaedia Britannica, 15th ed , vol. 8, p. 299; World Book Encyclopedia, vol. 13, p. 783.
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