Great circleW
Great circle
Great-circle distanceW
Great-circle distance
Half-side formulaW
Half-side formula
Lénárt sphereW
Lénárt sphere
Pentagramma mirificumW
Pentagramma mirificum
Spherical geometryW
Spherical geometry
Spherical law of cosinesW
Spherical law of cosines
Legendre's theorem on spherical trianglesW
Legendre's theorem on spherical triangles