Glossary entry (derived from question below)
English term or phrase:
libration
French translation:
libration
Apr 13, 2009 12:35
15 yrs ago
English term
libration
GBK
English to French
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)
Proposed translations
(French)
| 5 +2 | libration |
Bruce Sanderson
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Proposed translations
+2
23 mins
Bruce Sanderson
20 years of experience with patents
Native in: English 
, French
Works in: English to French, German to English, German to French, and 1 more.
Related KudoZ points
:
4
Selected
libration
Definition from
Grand mémento encyclopédique Larousse:
Il s'ensuit donc de petits décalages dans un sens ou dans l'autre, une sorte de balancement dénommé libration.
Example sentences:
libration Balancement de la Lune autour de son axe. L’égalité de la durée de la rotation lunaire et de sa révolution sidérale empêcherait théoriquement un observateur terrestre d’apercevoir plus d’une seule face lunaire. Mais, grâce aux phénomènes de la libration, il connaît 59 pour cent de la surface totale. Une partie considérable de ces phénomènes est le résultat d’une sorte d’irrégularité dans la vitesse de la révolution lunaire autour de la Terre. Tandis que la vitesse de rotation reste toujours constante, celle de la révolution varie au cours du trajet de la Lune : comme son orbite n’est pas circulaire mais elliptique, la vitesse se réduit jusqu’à un minimum au moment où le point le plus éloigné de la Terre est atteint, pour accélérer au maximum au point le plus proche de notre planète (Aldébaran)
4 KudoZ points awarded for this answer.
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