Colure

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Not to be confused with Coulure.
Orange = equinoctial colure
Blue = solstitial colure
G = equinoctial colure
H = solstitial colure

Colure, in astronomy, is either of the two principal meridians of the celestial sphere.

Equinoctial colure[edit]

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[edit]

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. There are several stars closely aligned with the solstitial colure: Pi, Beta, Delta Aurigae, and Theta. This makes the solstitial colure point towards the North Celestial Pole and Polaris.

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