right ascensionn.

Brit.

/ˌrʌɪt əˈsɛnʃn/, U.S.

/ˌraɪd əˈsɛn(t)ʃ(ə)n/

Forms: see right adj. and int. and ascension n.

Origin: Formed within English, by compounding. Etymons: right adj., ascension n.

Etymology: < right adj. + ascension n.

Astronomy and Astrology.

A coordinate used together with declination to specify the location of a point or object on the celestial sphere in the equatorial coordinate system, being the angular distance of an object from the first point of Aries (the vernal equinox) measured eastwards along the celestial equator to where the hour circle of the object meets the equator; (equivalently) the angular distance of an object from the point on the equator which rises with the object in a right sphere. Abbreviated R.A. Cf. right descension n. at right adj. and int. Compounds 2.Right ascension is the celestial analogue of terrestrial longitude, but is conventionally expressed in hours, minutes, and seconds of sidereal time; the equivalent of terrestrial latitude is declination (declination n. 7).

ΘΚΠ

the world > the universe > star > ascension > [noun] > right ascension

right ascension?1558

c1400 ( G. Chaucer Treat. Astrolabe (Brussels) (1940) ii. §28. f. 92 Tortuos signes or croked signes..ben obedient to the signes that ben of riȝt ascencion. The signes of riȝt ascencioun ben fro the heued of Cancer vnto the heued of sagittarie.

c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) ii. §26. 36 The vtilite to knowe the Assenciouns in the rihte cercle is this [etc.].]

?1558 H. Baker tr. O. Fine Rules Vse of Almanackes (new ed.) sig. D.vii^v Afterwarde foloweth the right ascention of the same sterres, that is to saye, the arche of the Equinoctiall, beginninge at the diuision of the springe time, and heade of Aries, ascending aboue the horizont with the saide sterres in the right spheare, and vnder euery merediane.

1594 T. Blundeville Exercises ii. f. 53 Knowing the Sunnes place, you shall learne the right ascention thereof thus.

1690 W. Leybourn Cursus mathematicus 367 Such is the Sun's Right Ascension when he is in 29 deg. of Taurus.

1755 B. Martin Mag. Arts & Sci. 185 The same Thing which on the terrestrial Globe and Maps is called Longitude, is, on the celestial Globe and Sphere, called Right Ascension.

1814 J. Playfair Outl. Nat. Philos. II. i. v. 79 The parallax in right ascension is nothing, when any body is on the meridian.

1882 Knowledge No. 15. 317 Transit observers have to determine the declination of a star as well as what is called the right ascension.

1906 A. Leo Progressed Horoscope xiii. 221 The Right Ascension (R.A.) of a star or planet is that degree and minute of the equinoctial, counted from the beginning of Aries, which comes to the zenith meridian with that star.

1960 J. Clendinning Princ. Surv. (ed. 2) ii. xvi. 300 The sun's right ascension increases by approximately 4m. a day and 2h. per month from 0h. at the vernal equinox to 24h., when it returns to the same point.

2001 P. Moore 2002 Yearbk. Astron. i. 89 The right ascension of Sirius is therefore 6h 45m.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	right ascension
释义	right ascensionn. Brit. /ˌrʌɪt əˈsɛnʃn/, U.S. /ˌraɪd əˈsɛn(t)ʃ(ə)n/ Forms: see right adj. and int. and ascension n. Origin: Formed within English, by compounding. Etymons: right adj., ascension n. Etymology: < right adj. + ascension n. Astronomy and Astrology. A coordinate used together with declination to specify the location of a point or object on the celestial sphere in the equatorial coordinate system, being the angular distance of an object from the first point of Aries (the vernal equinox) measured eastwards along the celestial equator to where the hour circle of the object meets the equator; (equivalently) the angular distance of an object from the point on the equator which rises with the object in a right sphere. Abbreviated R.A. Cf. right descension n. at right adj. and int. Compounds 2.Right ascension is the celestial analogue of terrestrial longitude, but is conventionally expressed in hours, minutes, and seconds of sidereal time; the equivalent of terrestrial latitude is declination (declination n. 7). ΘΚΠ the world > the universe > star > ascension > [noun] > right ascension right ascension?1558 c1400 ( G. Chaucer Treat. Astrolabe (Brussels) (1940) ii. §28. f. 92 Tortuos signes or croked signes..ben obedient to the signes that ben of riȝt ascencion. The signes of riȝt ascencioun ben fro the heued of Cancer vnto the heued of sagittarie. c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) ii. §26. 36 The vtilite to knowe the Assenciouns in the rihte cercle is this [etc.].] ?1558 H. Baker tr. O. Fine Rules Vse of Almanackes (new ed.) sig. D.vii^v Afterwarde foloweth the right ascention of the same sterres, that is to saye, the arche of the Equinoctiall, beginninge at the diuision of the springe time, and heade of Aries, ascending aboue the horizont with the saide sterres in the right spheare, and vnder euery merediane. 1594 T. Blundeville Exercises ii. f. 53 Knowing the Sunnes place, you shall learne the right ascention thereof thus. 1690 W. Leybourn Cursus mathematicus 367 Such is the Sun's Right Ascension when he is in 29 deg. of Taurus. 1755 B. Martin Mag. Arts & Sci. 185 The same Thing which on the terrestrial Globe and Maps is called Longitude, is, on the celestial Globe and Sphere, called Right Ascension. 1814 J. Playfair Outl. Nat. Philos. II. i. v. 79 The parallax in right ascension is nothing, when any body is on the meridian. 1882 Knowledge No. 15. 317 Transit observers have to determine the declination of a star as well as what is called the right ascension. 1906 A. Leo Progressed Horoscope xiii. 221 The Right Ascension (R.A.) of a star or planet is that degree and minute of the equinoctial, counted from the beginning of Aries, which comes to the zenith meridian with that star. 1960 J. Clendinning Princ. Surv. (ed. 2) ii. xvi. 300 The sun's right ascension increases by approximately 4m. a day and 2h. per month from 0h. at the vernal equinox to 24h., when it returns to the same point. 2001 P. Moore 2002 Yearbk. Astron. i. 89 The right ascension of Sirius is therefore 6h 45m. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.?1558
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