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COLURE (from Gr. icoXos, shortened, and oupa, tail)
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COLURE (from Gr. icoXos, shortened, and oupa, tail), in astronomy, 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.