libration
- Noun. The act of librating.
- Noun. (astronomy) The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface.
- Noun. (context, by extension) A similar rotational or orbital characteristic of some other celestial body.
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This entry was last updated on RefTopia from its source on 3/20/2012.