Colure

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Colure, in astronomy, is either of the two principal meridians of the celestial sphere, one of which passes through the poles and the two solstices, the other through the poles and the two equinoxes; hence designated as solstitial colure and equinoxial colure, respectively.

This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.