cie

17-21-034

steradian

sr

SI unit of solid angle

Note 1 to entry: 1 sr is equal to the solid angle that, having its vertex at the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the radius of the sphere.

Note 2 to entry: This entry was numbered 845-01-20 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-1266 in CIE S 017:2011.

Publication date: 2020-12
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