Colure
Sign in to savethumb|upright=1.3|Orange = equinoctial colure Blue = solstitial colure thumb|G = equinoctial colure H = solstitial colure Colure, in astronomy, is either of the two principal meridians of the celestial sphere. The term is now rarely used and may be considered obsolete.
~1 min read
Article
4 sectionsContents
- Equinoctial colure
- Solstitial colure
- See also
- References
thumb|upright=1.3|Orange = equinoctial colure Blue = solstitial colure thumb|G = equinoctial colure H = solstitial colure Colure, in astronomy, is either of the two principal meridians of the celestial sphere. The term is now rarely used and may be considered obsolete.
==Equinoctial colure== The equinoctial colure is the meridian or great circle of the celestial sphere which passes through the celestial poles and the two equinoxes: the first point of Aries and the first point of Libra. It is the great circle consisting of all points on the celestial sphere with Right Ascension equal to 0 hours or 12 hours (equivalent to RA 0° / 180°).