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{%type%} Definitions

WordNet 3.0Copyright Princeton University


Short "hint"

Perturbation of the moon's motion in its orbit due to the attraction of the sun.

Usage examples (7)
  • This he called the evection, and introduced another epicycle to represent it.
  • In quadrature, however, where the half-moon formed a right angle at the earth with the sun, the distance moon-earth had to be reduced to conform with this “evection,” as...
  • It then gives Ptolemy's own great discovery -- that which has made his name immortal -- the discovery of the moon's evection or second inequality, reducing it to the...
  • He was a working astronomer, and he made at least one original discovery of some significance -- namely, the observation of a hitherto unrecorded irregularity of the moon's... for more
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