Linked from

The 14 pages that link to Spherical trigonometry, each with the reason it gives.

• Celestial navigationRelated: Sight-reduction formulas relate Earth position to a body's altitude and azimuth.

• Spherical geometryRelated: It supplies calculation tools for navigation and celestial measurements on a sphere.

• Trigonometric functionsRelated: Its formulas extend triangle trigonometry to navigation and geometry on curved surfaces.

• Islamic astronomyNarrower topic: Its formulas supported calculations of celestial coordinates and directions on Earth.

• Al-BiruniRelated: It supplied tools for relating observations on the sky to positions on Earth.

• Elliptic geometryRelated: Its formulas describe triangles in the spherical representation of elliptic geometry.

• Spherical astronomyRelated: Its formulas solve positional problems involving arcs on the celestial sphere.

• Spherical triangleNarrower topic: Its identities provide the main calculation rules for these figures.

• Menelaus's theoremRelated: Menelaus's spherical theorem became a tool for ancient astronomical calculations.

• History of trigonometryBroader topic: Celestial calculations required triangle geometry on the sky's spherical surface.

• Ibn YunusRelated: Spherical geometry supplied methods for translating celestial coordinates and calculating astronomical events.

• Law of cotangentsCompared with: Spherical triangle angles do not generally sum to π, so this Euclidean identity does not apply unchanged.

• Legendre's theorem on spherical trianglesNarrower topic: The theorem converts a spherical-trigonometry problem into a plane-triangle one.

• Mollweide's formulaCompared with: Mollweide's identities rely on the Euclidean triangle angle sum and do not transfer unchanged.