celestial equator

(redirected from equinoctial circle)
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celestial equator:

see equatorial coordinate systemequatorial coordinate system,
the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celestial sphere. The celestial sphere is an imaginary sphere with the observer at its center.
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celestial equator

The great circle in which the extension of the Earth's equatorial plane cuts the celestial sphere. The plane of the celestial (and hence terrestrial) equator is perpendicular to the celestial axis and is the reference plane for the equatorial coordinates right ascension and declination. The orientation of the celestial equator is slowly changing as a result of the precession of the Earth's axis.

Celestial Equator

(religion, spiritualism, and occult)

The celestial equator, also termed the equinoctial, is the terrestrial equator imaginarily projected outward from Earth and onto the background of the stars (i.e., against the backdrop of the celestial sphere). Because of the tilt of the Earth on its axis, the celestial equator intersects the ecliptic at an angle of 23½°. Similarly, the celestial poles are the north and south poles projected outward against the backdrop of the celestial sphere.

celestial equator

[sə′les·chəl i′kwād·ər]
(astronomy)
The primary great circle of the celestial sphere in the equatorial system, everywhere 90° from the celestial poles; the intersection of the extended plane of the equator and the celestial sphere. Also known as equinoctial.

celestial equator

celestial equator
The great circle of the celestial sphere, in which all points are 90° from the poles. It is the plane of the earth's equator projected onto the celestial sphere. Also called equinoctial.

celestial equator

the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles