Retrieving "Earths Geographic Equator" from the archives

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1. Celestial Equator

   Linked via "Earth's geographic equator"

   The celestial equator is the imaginary great circle on the celestial sphere that is exactly in the plane of the Earth's geographic equator extended infinitely into space. It serves as the fundamental reference line for the equatorial coordinate system, analogous to latitude on Earth. Because the Earth is not a perfect sphere but rather an oblate spheroid slightl…