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| '''Right ascension (RA)''' is an ] term associated with the ]. RA is comparable to longitude, measured from a zero point known as the ''']'''. RA is measured in hours, minutes, and seconds; with one hour equal to 15 degrees. | |||
| ] | |||
| In ], '''right ascension''' is, along with ], one of the two equatorial coordinates used to define position on the celestial sphere. | |||
| See also: ] | |||
| It is similar to ] on the ], but is measured from a zero point known as the ''First Point of Aries''. | |||
| (The First Point of Aries is the point where the ] meets the celestial equator in the ] of ].) | |||
| It is conventionally measured in hours, minutes and seconds, rather than degrees, with one hour equal to 15 degrees. | |||
Revision as of 17:40, 31 October 2002
Right ascension (RA) is an astronomical term associated with the equatorial coordinate system. RA is comparable to longitude, measured from a zero point known as the First Point of Aries. RA is measured in hours, minutes, and seconds; with one hour equal to 15 degrees.
See also: declination