the difference between the sum of the angles of a spherical triangle and two right angles.
noun 1. the branch of geometry that deals with figures on spherical surfaces. spherical geometry noun 1. the branch of geometry concerned with the properties of figures formed on the surface of a sphere spherical geometry The geometry of circles, angles, and figures on the surface of a sphere.
- Spherical lens
spherical lens n. Abbr. sph A lens in which all refracting surfaces are spherical.
noun, Geometry. 1. a closed figure formed by arcs of great circles on a spherical surface. spherical polygon noun 1. a closed geometric figure formed on the surface of a sphere that is bounded by three or more arcs of great circles
noun 1. a method of navigation in which the curvature of the earth is taken into consideration.