evection

evection [ih-vek-shuh n] ExamplesWord Origin noun Astronomy.

1. a periodic irregularity in the moon’s motion, caused by the attraction of the sun.

Origin of evection 1650–60; Latin ēvectiōn- (stem of ēvectiō) a going upwards, flight, equivalent to ēvect(us) (past participle of ēvehere to carry forth, move forth) + -iōn- -ion Related formse·vec·tion·al, adjective Examples from the Web for evection Historical Examples of evection

This he called the evection, and introduced another epicycle to represent it.

Kepler

Walter W. Bryant

His chief discovery was an irregularity of the lunar motion, called the ‘evection.’

The Astronomy of Milton’s ‘Paradise Lost’

Thomas Orchard

British Dictionary definitions for evection evection noun

1. irregularity in the moon’s motion caused by perturbations of the sun and planets

Derived Formsevectional, adjectiveWord Origin for evection C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry