Spherical lune

The phases of the moon make spherical lunes perceived as the intersection of a semicircle and semi-ellipse.

Stereographic projection of the 3-sphere's parallels (red), meridians (blue) and hypermeridians (green). Lunes exist between pairs of blue meridian arcs.

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

A spherical wedge is the volume of space bounded by two planes passing through a sphere center and the surface of the sphere.

单词	Spherical lune
释义	Spherical lune 英语百科 Spherical lune In spherical geometry, a spherical lune is an area on a sphere bounded by two half great circles which meet at antipodal points, and is an example of a digon, {2}_θ, with dihedral angle θ. The word "lune" derives from luna, the Latin word for Moon. A spherical wedge is the volume of space bounded by two planes passing through a sphere center and the surface of the sphere.
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