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| In ], '''right ascension''' is, along with ], one of the two equatorial coordinates used to define position on the celestial sphere. | In ], '''right ascension''' is, along with ], one of the two equatorial coordinates used to define position on the celestial sphere. | ||
| It is similar to ] on the ], but is measured from a zero point known as the ''First Point of Aries''. | It is similar to ] on the ], but is measured from a zero point known as the ''First Point of Aries''. | ||
Revision as of 15:07, 30 September 2002
In astronomy, right ascension is, along with declination, one of the two equatorial coordinates used to define position on the celestial sphere. It is similar to longitude on the Earth, but is measured from a zero point known as the First Point of Aries. (The First Point of Aries is the point where the ecliptic meets the celestial equator in the constellation of Pisces.) It is conventionally measured in hours, minutes and seconds, rather than degrees, with one hour equal to 15 degrees.