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right ascension
right ascensionn. Abbr. RA The angular distance of a celestial body or point on the celestial sphere, measured eastward from the vernal equinox along the celestial equator to the hour circle of the body or point and expressed in degrees or hours.right ascension n (Units) astronomy the angular distance measured eastwards along the celestial equator from the vernal equinox to the point at which the celestial equator intersects a great circle passing through the celestial pole and the heavenly object in question. Symbol: α Compare declination1 right′ ascen′sion
n. the arc of the celestial equator measured eastward from the vernal equinox to the foot of the great circle passing through the celestial poles and a given point on the celestial sphere, expressed in degrees or hours. [1585–95] right ascension The position of a celestial object east of the vernal equinox along the celestial equator, measured as a horizontal angle and expressed in degrees or hours. Right ascension and declination are the measurements used to map objects on the celestial sphere. See more at celestial sphere.right ascension(ra) A space object’s angular distance to the east of the vernal equinox.Thesaurus| Noun | 1. | right ascension - (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"celestial longitude, RAastronomy, uranology - the branch of physics that studies celestial bodies and the universe as a wholeangular distance - the angular separation between two objects as perceived by an observer; "he recorded angular distances between the stars" |
Translations
right ascension
right ascension, in astronomy, one of the coordinates in the 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.
..... Click the link for more information. . The right ascension of a celestial body is the angular distance measured eastward from the vernal equinox along the celestial equator to its intersection with the body's hour circlehour circle,
in astronomy, a secondary axis in the equatorial coordinate system. The hour circle of a celestial body is the great circle on the celestial sphere that passes through both the body and the north celestial pole.
..... Click the link for more information. .right ascension (RA) Symbol: α. A coordinate used with declination in the equatorial coordinate system. The right ascension of a celestial body, etc., is its angular distance measured eastward along the celestial equator from the vernal (or dynamical) equinox, or more precisely from a catalog equinox, to the intersection of the hour circle passing through the body. It is generally expressed in hours (h), minutes (m), and seconds (s) from 0 to 24h: one hour equals 15° of arc.right ascension[′rīt ə′sen·chən] (astronomy) A celestial coordinate; the angular distance taken along the celestial equator from the vernal equinox eastward to the hour circle of a given celestial body. Abbreviated R.A. AcronymsSeeRAright ascension
Related to right ascension: declinationSynonyms for right ascensionnoun (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the skySynonymsRelated Words- astronomy
- uranology
- angular distance
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