Colure, in astronomy, is either of the two principal meridians of the celestial sphere.
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The equinoctial colure is the meridian 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.
The solstitial colure is the meridian of the celestial sphere which passes through the poles and the two solstices: the first point of Cancer and the first point of Capricorn.