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Related to equinoctial colure: solstitial colure
equinoctial colureSee colures.
the great circle on the celestial sphere which passes through the celestial poles and the vernal and autumnal equinoxes.
equinoctial colure[‚ē·kwə′näk·shəl kə′lu̇r]
The great circle of the celestial sphere through the celestial poles and the equinoxes; the hour circle of the vernal equinox.
vernal equinox. It is an imaginary point among the stars where the sun apparently crosses the equator from south to north on or about March 20 through 23 of each year. Also called a vernal equinox or a spring equinox.