steradians

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Definitions from WordNet

Noun steradian has 1 sense

steradian, sr - the unit of solid angle adopted under the Systeme International d'Unites
--₁ is a kind of angular unit
--₁ is a part of sphere

Definitions from the Web

Steradians

Definition:

(noun) A unit of solid angle measure in three-dimensional space. It is equal to the angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the square of its radius.
(noun) The SI unit of solid angle, symbolized as sr.

Examples:

1. The steradians of an entire sphere is equal to 4π.
2. The light emitted by a point source spreads uniformly in all directions covering the same number of steradians.
3. The solid angle of a cone with a vertex at the sphere's center is given by the formula: Ω = 2π(1 - cos(θ/2)), where θ is the cone's apex angle in radians.

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