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libration

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16:59 Feb 3, 2010
English to Slovak translations [PRO]
Science - Astronomy & Space
English term or phrase: libration
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 sentence(s):
  • 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
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Summary of translations provided
4librácia
Michal Zugec


  

Translations offered


10 days   confidence: Answerer confidence 4/5Answerer confidence 4/5
librácia


Definition from Wikipedia:
Librácia je veľmi pomalá oscilácia, skutočná alebo zdanlivá, satelitu alebo obežnice pozorovanej z väčšieho nebeského telesa, ktoré satelit obieha. Obyčajne sa pod pojmom librácia myslí pohyb Mesiaca, ako sa javí pozorovateľovi na Zemi. Vďaka librácii sme schopní zo Zeme pozorovať približne 59 % povrchu Mesiaca.

Librácia Mesiaca ma 3 príčiny:

sklon osi otáčania Mesiaca k obežnej rovine okolo Zeme (nastáva podobný jav ako sú ročné obdobia na Zemi pri obehu Slnka)
excentricita obežnej dráhy (obežná dráha je elipsa a preto sa na nej Mesiac pohybuje rôznou rýchlosťou (pozri druhý Keplerov zákon) a striedavo tak predbieha, resp. mešká za rotáciou okolo vlastnej osi)
rotácia Zeme (pozorovateľ pozoruje Mesiac z rôznych uhlov)

Example sentence(s):
  • Druhú, "odvrátenú stranu", nie je možné zo Zeme z väčšej časti vidieť, okrem malých častí na okraji disku, ktoré možno príležitostne vidieť vďaka librácii. - Astronomy  
Michal Zugec
Slovakia
Local time: 00:33
Native speaker of: Slovak
PRO pts in category: 8
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