second equinoctial colure是什么意思 second equinoctial colure在线中文翻译

second equinoctial colure

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英语释义

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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second equinoctial colure是什么意思 second equinoctial colure在线中文翻译

second equinoctial colure

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