Celestial equator - Wikipedia

Astronomy: The Celestial Sphere

Horizontal coordinate system - Wikipedia

File:Axial Tilt of Earth.svg - Wikimedia Commons

Astronomical coordinate systems - Wikipedia

Which star was close to the South Celestial Pole just over 2, 200 years ago? - Quora

Axial precession - Wikipedia

Northern celestial hemisphere - Wikipedia

File:Equatorial coordinates.svg - Wikimedia Commons

Circumpolar star - Wikiwand

What do we call the celestial coordinate that is similar to the Earth's longitude coordinate? - Quora