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Related to celestial equator: celestial poles
A great circle on the celestial sphere in the same plane as the earth's equator. Also called equinoctial, equinoctial circle.
(Astronomy) the great circle lying on the celestial sphere, the plane of which is perpendicular to the line joining the north and south celestial poles. Also called: equinoctial or equinoctial circle
the great circle of the celestial sphere, lying in the same plane as the earth's equator.
A great circle on the celestial sphere in the same plane as the Earth's equator.