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Meaning Of Equator
n.
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.
n.
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.