The Celestial Equator is an imaginary great circle projected onto the Celestial Sphere, lying in the same plane as Earth's Equator. It marks the fundamental divide between the northern and southern celestial hemispheres, guiding the mapping of stars and planets across the sky.
Celestial Equator
Linked from: Autumn Equinox, Equinox, North Celestial Pole, Right Ascension, South Celestial Pole
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