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...