# Solid and Dihedral Angles of a Tetrahedron

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During an eclipse, the Moon and Sun appear to have roughly the same size viewed from Earth. The field of view of an object is called the solid angle. A unit sphere around the observer has a solid angle of steradians, the same as the surface area.

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Contributed by: Ed Pegg Jr (July 2018)

Open content licensed under CC BY-NC-SA

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