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A spherical angle is a particular dihedral angle; it is the angle between two intersecting arcs on a sphere, and is measured by the angle between the planes containing the arcs (which would naturally also contain the centre of the sphere).[1]
See also

Spherical trigonometry


Green, Robin Michael (1985), Spherical Astronomy, Cambridge University Press, p. 3, ISBN 9780521317795.

Mathematics Encyclopedia

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