Sentence Examples


  • The most important of these are his memoirs "Sur les inegalites seculaires des moyens mouvements des planetes," "Sur la variation des constantes arbitraires dans les questions de mecanique," both published in the Journal of the Ecole Polytechnique (1809); "Sur la libration de la lune," in Connaiss.
  • This apparent oscillation is called libration, and its amount on each side of the mean is commonly between 6° and 7°.
  • There is also a libration in latitude, arising from the fact that the axis of rotation of the moon is not precisely perpendicular to the plane of her orbit.
  • This libration is more regular than that in longitude, its amount being about 60° 44' on each side of the mean.
  • The other side of the moon is therefore invisible from the earth, but in consequence of the libration about six-tenths of the lunar surface may be seen at one time or another, while the remaining four-tenths are for ever hidden from our view.
 

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