Libration meaning

lī-brāshən
A very slow oscillation, real or apparent, of a satellite as viewed from the larger celestial body around which it revolves.
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A slight, apparent rocking motion of the moon as seen from the earth, allowing approximately 59% of the moon's surface to be visible.
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The act of librating.
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(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.
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(by extension) A similar rotational or orbital characteristic of some other celestial body.
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Origin of libration

  • Latin lībrātiō lībrātiōn- oscillation from lībrātus past participle of lībrāre to balance from lībra balance

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin lÄ«brātiō (“a hurling, swinging"), from lÄ«brō (“poise, cause to swing").

    From Wiktionary