general/astronomical-coordinate-systems

Imaginary line halfway between Earth's North and South poles

Center of mass of multiple bodies orbiting each other

Coordinate frames

Imaginary sky rotation points

Astronomical location

Part of celestial coordinate system

Great semicircle passing through the celestial poles

Coordinates used in the equatorial coordinate system

Great circle on the celestial sphere that is perpendicular to the horizon

Current standard celestial reference system and frame

Celestial coordinate system used to specify the positions of celestial objects

Celestial coordinate system

Circle on the celestial sphere parallel to the horizon

Celestial coordinate system used to describe Solar System objects