1) Oscillation 2) Variation
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https://www.crosswordclues.com/clue/libration
In astronomy, libration is a perceived oscillating motion of orbiting bodies relative to each other, notably including the motion of the Moon relative to Earth, or of Trojan asteroids relative to planets. Libration is distinct from the slight changes in the Moon`s visual size as seen from Earth. Although this can also be described as an oscillati....
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http://en.wikipedia.org/wiki/Libration
[molecule] Libration (from the Latin verb librare `to balance, to sway`; cf. libra `scales`) is a type of reciprocating motion in which an object with a nearly fixed orientation repeatedly rotates slightly back and forth. In physics and chemistry, a molecule (or other group of atoms) can undergo libration if it is subject to external forces...
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http://en.wikipedia.org/wiki/Libration_(molecule)
Most often applied to the Moon
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http://jot101.com/2015/05/a-z-of-science-fiction-words/
apparent oscillation of moon's visible surface
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http://phrontistery.info/l.html
the small oscillations in the moons motion that allow Earth-based observers to see slightly more than half the moons surface.
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http://planetfacts.org/space-terms/
• (n.) A real or apparent libratory motion, like that of a balance before coming to rest. • (n.) The act or state of librating.
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http://thinkexist.com/dictionary/meaning/libration/
in astronomy, an oscillation, apparent or real, of a satellite, such as the Moon, the surface of which may as a consequence be seen from different ... [1 related articles]
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http://www.britannica.com/eb/a-z/l/46
Any of several periodic rocking motions of an orbiting body. The various librations of the Moon enable, over time, about 59% of the Moon's surface to be seen from Earth. Libration in latitude, a north-south nodding, is caused by the tilt of the Moon's rotation axis relative to its orbital plane. The...
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http://www.daviddarling.info/encyclopedia/L/libration.html
The apparent tilting of the Moon as seen from Earth. The result is that over a period of time it is possible to see 59% of the surface of the Moon from Earth, though of course, only 50% at any one time.
Found on
http://www.encyclo.co.uk/local/20448
1. The act or state of librating. ... 2. <astronomy> A real or apparent libratory motion, like that of a balance before coming to rest. Libration of the moon, any one of those small periodical changes in the position of the moon's surface relatively to the earth, in consequence of which narrow portions at opposite limbs become visible or invi...
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http://www.encyclo.co.uk/local/20973
Li·bra'tion (li*brā'shŭn)
noun [ Latin
libratio : confer French
libration .]
1. The act or state of librating.
Jer. Taylor. 2. (Astron.) A real or apparent libratory motion, like that of a balance before coming to rest.
Libration of the m...Found on
http://www.encyclo.co.uk/webster/L/37
In astronomy, libration is an apparent oscillatory motion of the moon, arising from the fact that it does not move round the earth with a uniform angular velocity exactly equal to its angular velocity of rotation on its axis, and that its axis is not at right angles to the plane of its orbit, but is inclined 1 degree 32 minutes and 9 seconds. In th...
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http://www.probertencyclopaedia.com/browse/GL.HTM
An effect caused by the apparent wobble of the Moon as it orbits the Earth. The Moon always keeps the same side toward the Earth, but due to libration, 59% of the Moon's surface can be seen over a period of time.
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http://www.seasky.org/astronomy/astronomy-glossary.html
A slight tipping and tilting of the Moon from week to week that brings various features along the limb into better view. The main causes are two aspects of the Moons orbit: its elliptical shape and inclination to the ecliptic.
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http://www.skyandtelescope.com/astronomy-terms/
[
n] - (astronomy) a real or apparent slow oscillation of a moon or satellite
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http://www.webdictionary.co.uk/definition.php?query=libration
libration A real or apparent oscillation in the orbit of one celestial body as seen from the one around which it orbits; especially, as seen in the Moon from the Earth.
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http://www.wordinfo.info/words/index/info/view_unit/2528/
The apparant rocking motion of an orbiting body. The Moon exhibits longitudinal, latitudinal and diurnal libration. See also: Keplers Laws.
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https://www.encyclo.co.uk/local/20687
noun (astronomy) a real or apparent slow oscillation of a moon or satellite; `the libration of the moon`
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https://www.encyclo.co.uk/local/20974
No exact match found.
