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Thesaurus: first equinoctial colure

first equinoctial colure (uncountable) (astronomy) An imaginary line from pole-to-pole on the celestial sphere where the sun crosses it on March equinox.

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Definitions

  1. first equinoctial colure (uncountable) (astronomy) An imaginary line from pole-to-pole on the celestial sphere where the sun crosses it on March equinox.