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Libration

LIBRATION (Lat. libra, a balance), a slow oscillation, as of a balance; in astronomy especially the seeming oscillation of the Moon around her axis, by which portions of her surface near the edge of the disk are alternately brought into sight and swung out of sight.

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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