libration

[lahy-brey-shuhn]
noun Astronomy.
a real or apparent oscillatory motion, especially of the moon.

Origin:
1595–1605; < Latin lībrātiōn- (stem of lībrātiō) a balancing. See librate, -ion

librational, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To libration
Collins
World English Dictionary
libration (laɪˈbreɪʃən)
 
n
1.  the act or an instance of oscillating
2.  a real or apparent oscillation of the moon enabling approximately 59 per cent of the surface to be visible from the earth over a period of time
 
[C17: from Latin librātus, from librāre to balance]
 
li'brational
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Encyclopedia Britannica
Encyclopedia

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 angles at different times from one point on its primary body

Learn more about libration with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
They took advantage of libration to make a stereogram.
Image for libration
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature