evection

American

[ih-vek-shuhn] / ɪˈvɛk ʃən /

noun

Astronomy.

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

evection British

/ ɪˈvɛkʃən /

noun

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

evectional

adjective

Etymology

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

Example Sentences

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See Examples For:

evection

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.

From Astronomy: The Science of the Heavenly Bodies by David Peck Todd

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

From Kepler by Walter W. (Walter William) Bryant

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023