evection

[ih-vek-shuhn]

noun

Astronomy.

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

evection

/ ɪˈvɛkʃən /

noun

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

Other Word Forms

• evectional adjective

Word History and Origins

Origin of evection¹

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

Word History and Origins

Origin of evection¹

C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry

Example Sentences

Frustration among far-left lawmakers has reached a fever pitch over the failure of the Democrat-run Congress to keep in place a federal moratorium on evictions, despite knowing for months that the Supreme Court would toss out the evection ban.

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Their orbits would have expanded slowly for billions of years until the radius of the more distant one’s orbit was 8.3 times that of Saturn—at which point it would have entered a powerful evection and started swinging around like a wild thing.

Read more on Economist

Dr Cuk’s explanation relies on another form of orbital perturbation called an evection.

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Here his mathematical powers are at their best, and he made a discovery of an inequality in the moon's motion known as the evection.

Read more on Project Gutenberg

In astronomy, besides his capital discovery of the precession of the equinoxes just mentioned, he also determined the first inequality of the moon, the equation of the centre, and all but anticipated Ptolemy in the discovery of the evection.

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