Linked from
The 30 pages that link to Astronomical coordinate systems, each with the reason it gives.
AstronomyRelated: Astronomers use shared coordinates to locate and compare objects in the sky.
Spherical triangleRelated: Coordinate conversions often reduce to solving spherical triangles.
Star chartRelated: Coordinates let charts mark and communicate precise sky positions.
Celestial globeRelated: Coordinates determine where stars and other markings appear on the globe.
PictorRelated: Pictor’s boundaries and stars are located using celestial coordinates.
Pi PuppisRelated: Coordinates locate Pi Puppis independently of its traditional name.