Definition of right ascension in English:

right ascension

Syllabification: right as·cen·sion
(abbreviation: RA)


The distance of a point east of the First Point of Aries, measured along the celestial equator and expressed in hours, minutes, and seconds. Compare with declination and celestial longitude.
More example sentences
  • The motion of the telescope to the east and west is referred to as the right ascension or hour angle of the telescope.
  • PSR is astronomical shorthand for pulsar, while 1913 is the pulsar's right ascension in celestial coordinates.
  • Any object on the same hour circle will have the same right ascension, just as any place on earth on the same meridian of longitude has the same longitude.

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