Feb 3, 2010 16:59
14 yrs ago
English term
libration
GBK
English to Finnish
Science
Astronomy & Space
Definition from
astronomy.com:
The small oscillations in the moon’s motion that allow Earth-based observers to see slightly more than half the moon’s surface
Example sentences:
Libration is the apparent side to side rocking and up and down nodding of the Moon. There are two components: the more obvious "optical" and the very subtle "physical" libration. (www3.telus.net)
Although the Moon always presents us with the same face towards the Earth, due to its rotation and revolution being tidally locked to the same period, the combined effect of all these different librations allows us over time to see some 59% of the Moon's surface. (Wertern Washington University)
Libration in longitude is a consequence of the Moon's orbit around Earth being somewhat eccentric, so that the Moon's rotation sometimes leads and sometimes lags its orbital position. (NationMaster.com)
Change log
Feb 3, 2010 16:06: changed "Kudoz queue" from "In queue" to "Public"
Feb 3, 2010 16:59: changed "Stage" from "Preparation" to "Submission"
Feb 6, 2010 18:03: changed "Stage" from "Submission" to "Selection"