Colure
Principal meridians of the celestial sphere From Wikipedia, the free encyclopedia
Colure, in astronomy, is either of the two principal meridians of the celestial sphere.[1] The term is now rarely used and may be considered obsolete.
Blue = solstitial colure
H = solstitial colure
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:[1] 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°).
The equinoctial colure passes through the following constellations:
Solstitial colure
The solstitial colure is the meridian or great circle of the celestial sphere which passes through the poles and the two solstices:[1] the first point of Cancer and the first point of Capricorn. It is the great circle consisting of all points on the celestial sphere with Right Ascension equal to 6 hours or 18 hours (equivalent to RA 90° / 270°).
The solstitial colure passes through the following constellations:
See also
References
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