Celestial Equator
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The celestial equator (green line)[1]
The projection of the Earth's equator into outer space, or to be more precise, onto the celestial sphere. The celestial equator is inclined by 23.4° to the ecliptic plane.
The points at which the ecliptic and the celestial equator intersect are the vernal equinox and the autumnal point.[2] The Sun crosses the celestial equator in a northerly direction at the vernal equinox, and in a southerly direction at the autumnal equinox.