Celestial-equator meaning

A great circle on the celestial sphere in the same plane as the earth's equator.
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The great circle formed on the celestial sphere by extending the plane of the earth's equator.
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A great circle separating the northern and southern hemispheres of the celestial sphere and lying in the same plane as the Earth's equator. The celestial equator is a projection of the Earth's equator outward onto the celestial sphere and is used as the reference point in determining a celestial body's declination .
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(astronomy) A great circle on the celestial sphere, coincident with the plane of earth's equator.
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