Spherical lune

In spherical geometry, a spherical lune (or biangle) is an area on a sphere bounded by two half great circles which meet at antipodal points. It is an example of a digon, {2}θ, with dihedral angle θ. The word "lune" derives from luna, the Latin word for Moon.

For the plane geometry region, see Lune (geometry).
This article is about the surface. For the volume, see Spherical wedge.
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