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abstraction > mathematical concept > unit > SI unit > derived SI unit > named derived SI unit > steradian

steradian comparison table

Subject	is an acronym for	has base unit	has proposal date	has unit	has definition	has symbol	is a kind of	has approval date	is an instance of	is a unit of
named derived SI unit	Syteme Internationale	defined in terms of the seven SI base units via a system of quantity equations		defined in terms of derived SI unit via a system of quantity equations			derived SI unit
solid angle unit							unit			solid angle
steradian	Syteme Internationale	m2·m-2 = 1	1880	defined in terms of derived SI unit via a system of quantity equations	Unit of solid (three-dimensional) angular measure. One steradian is equal to the angle subtended at the centre of a sphere by an area of surface equal to the square of the radius. The surface of a sphere subtends an angle of 4π steradians at its centre.	sr, Ω0		1900	named derived SI unit	solid angle

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