Linked from
The 11 pages that link to Spherical astronomy, each with the reason it gives.
SphereNarrower topic: Its central model turns directions in the sky into points on a sphere.
Ulugh BegNarrower topic: Its methods underpinned the observatory’s positional astronomy.
Spherical triangleNarrower topic: It applies spherical geometry to directions observed from Earth.
Bhāskara IIRelated: The astronomical sections apply geometric calculation to celestial positions.