celestial equator
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AI overview
The celestial equator is an imaginary line in the sky created by extending Earth's equator outward into space. Astronomers use it as a reference point for locating and tracking stars and other celestial objects, similar to how we use latitude and longitude on Earth.
AI-generated from the Wikipedia summary — may contain errors.
Article
The celestial equator is currently inclined by about 23.44° to the ecliptic plane. The image shows the relations between Earth's axial tilt (or obliquity), rotation axis, and orbital plane.
Celestial equator in relation to the galactic and ecliptic planes