Equatorial coordinate system

http://astrothesaurus.org/uat/467

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Celestial coordinate
Equatorial system
dcterms modified equal to or less than 2020-12-16T18:58:04.073Zequal to or more than 2020-12-16T18:58:04.073Z
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definition An astronomical coordinate system for indicating the positions of celestial objects on the celestial sphere. The system consists of two components, right ascension and declination. Right ascension is the angle between the vernal equinox and the point where the hour circle intersects the celestial equator. The right ascension is always measured eastward from the vernal equinox, in the units of hours, minutes, and seconds. Declination is the angle between the celestial equator and the position of the star measured along the star's hour circle. It is measured in degrees, minutes, and seconds north or south of the celestial equator. By definition, the vernal equinox is located at right ascension 0h and declination 0°. Equatorial coordinates change with time due to the precession of the Earth's rotation axis.
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contributor AAS_Frey.Katie_Admin original