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Thesaurus: second equinoctial colure

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

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Definitions

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