TERMIUM Plus®

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LIBRATION PHYSIQUE [1 record]

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Alphabetical list of terms

Record 1 1977-09-12

English

Subject field(s)
  • The Moon (Astronomy)
  • Planets
  • Astronomy
OBS

In addition to the principal librations, there is a slight physical libration, because the moon's rate of rotation is not quite uniform.

French

Domaine(s)
  • Lune (Astronomie)
  • Planètes
  • Astronomie
OBS

La libration physique, c'est-à-dire le balancement réel de la Lune, a lieu du fait que le demi-grand axe de l'ellipse lunaire s'écarte périodiquement de sa direction dans le sens de la Terre, alors que l'attraction terrestre tend à la remettre en cette position. La libration physique est très petite en grandeur (environ 2").

Spanish

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