French translation: libration

English term or phrase:libration
French translation:libration

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12:35 Apr 13, 2009
English to French translations [PRO]
Science - Astronomy & Space
English term or phrase: libration
Definition from
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.
  • 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.
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Il s'ensuit donc de petits décalages dans un sens ou dans l'autre, une sorte de balancement dénommé libration.
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Bruce Sanderson
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Summary of translations provided
5 +2libration
Bruce Sanderson


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23 mins   confidence: Answerer confidence 5/5 peer agreement (net): +2

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 sentence(s):
  • 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  
Bruce Sanderson
Local time: 03:26
Native speaker of: Native in EnglishEnglish, Native in FrenchFrench
PRO pts in category: 4

Votes in favor of/against selecting this as the best translation of the term asked
Yes  bagheera: ok
23 hrs

Yes  Ahmed Alami Aroussi
28 days
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