Spherical Trigonometry
- Angle Excess
- Colunar Triangle
- Gauss's Formulas
- Geodesic Triangle
- Girard's Spherical Excess Formula
- Jump Angle
- L'Huilier's Theorem
- Mikusiński's Problem
- Möbius Triangles
- Napier's Analogies
- Schläfli Function
- Schwarz Triangle
- Solid Angle
- Spherical Defect
- Spherical Excess
- Spherical Geometry
- Spherical Polygon
- Spherical Triangle
- Spherical Trigonometry
- Steinitz's Lemma
- Steradian