Colure
From Infogalactic: the planetary knowledge core
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File:Colure.png
Orange = equinoctial colure
Blue = solstitial colure
Blue = solstitial colure
Colure, in astronomy, is either of the two principal meridians of the celestial sphere.
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.
Solstitial colure
The solstitial colure is the meridian or great circle of the celestial sphere which passes through the poles and the two solstices: the first point of Cancer and the first point of Capricorn.
See also
References
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