Equator

Equator
Equator E*qua"tor, n. [L. aequator one who equalizes: cf. F. ['e]quateur equator. See {Equate}.] 1. (Geog.) The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres. [1913 Webster]

2. (Astron.) The great circle of the celestial sphere, coincident with the plane of the earth's equator; -- so called because when the sun is in it, the days and nights are of equal length; hence called also the {equinoctial}, and on maps, globes, etc., the {equinoctial line}. [1913 Webster]

{Equator of the sun} or {Equator of a planet} (Astron.), the great circle whose plane passes through through the center of the body, and is perpendicular to its axis of revolution.

{Magnetic equator}. See {Aclinic}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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