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celestial equator /səlˈɛstjəl ɪkwˈeɪtə/ n

中文：天赤道

中文 · 天赤道Español · ecuador celesteFrançais · équateur céleste
Meaning：Projection of the terrestrial Equator onto the celestial sphere; serves as the point of origin for declinations.
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Celestial coordinate system

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