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Word: libration (lookup usage) (lookup stats)


Meaning:

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.
  • by extension A similar rotational or orbital characteristic of some other celestial body.
  • The act of librating.

Source: Wiktionary | Src Info »