celestial equator


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Related to celestial equator: celestial poles

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
References in periodicals archive ?
equinox Either of the two points on the celestial sphere where the celestial equator intersects the
The phenomenon of similarity of the temporal change of the histogram shape near the moments of intersection of the celestial equator by a celestial body appears to be independent of the nature of the body (whatever the Sun, the Moon, Venus, Mars or Mercury).
Movement on the celestial equator is the basis for clock time but the real Sun moves at an angle to this.
But there's catch: Situated 2 1/2 [degrees] northeast of 3rd-magnitude Lambda ([lambda]) Sagittarii, M22 is almost as far south of the celestial equator as M4.
In a fantasy photo-montage called Physics Illustrated, Caprice holds up the world for inspection, rides a crescent moon and sits astride the celestial equator.
From the vantage point of the gate at sundown, the sun appears to descend into a narrow slot in the middle of the temple roof on the first day of fall and first day of spring - the two days the sun is directly on the celestial equator.
We had been working some calibration stars near the celestial equator, and I decided to swing the telescope to the zenith to obtain minimum background light and check performance in darker backgrounds.
Afterwards, Philippine nights will be a few minutes longer lthan day, as the sun moves below the celestial equator towards the southern hemisphere.
In this device the measuring piece of equipment with collimator was attached to the platform rotated in a plane of Celestial Equator.
Winter solstice marks the beginning of winter when the sun is at its lowest elevation in the sky - as it moves south of the celestial equator - and, thus, is the day with the shortest period of sunlight.
Last fall, Hu and McMahon used Keck to scan a patch of sky near the celestial equator.