Celestial equator - Wikipedia
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File:Orientation of astronomical coordinates projected on the Celestial Sphere.jpg - Wikimedia Commons
File:Celestial equator and ecliptic.svg - Wikipedia
March equinox - Wikipedia
Meridian (astronomy) - Wikipedia
Which star was close to the South Celestial Pole just over 2, 200 years ago? - Quora
What do we call the celestial coordinate that is similar to the Earth's longitude coordinate? - Quora
File:Celestial sphere with ecliptic.svg - Wikipedia
File:Ecliptic vs equator.PNG - Wikipedia
Earth-centered inertial - Wikiwand
File:Ecliptic path.jpg - Wikipedia
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