steradian

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steradian
If A = r2 then solid angle Ω = 1 sr.

ste·ra·di·an

 (stĭ-rā′dē-ən)
n. Abbr. sr
A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared. The total solid angle of a sphere is 4π steradians.

steradian

(stəˈreɪdɪən)
n
(Units) an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius. Symbol: sr
[C19: from stereo- + radian]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.steradian - the unit of solid angle adopted under the Systeme International d'Unites
angular unit - a unit of measurement for angles
sphere - a three-dimensional closed surface such that every point on the surface is equidistant from the center
Translations
stéradian
References in periodicals archive ?
The second factor was the apparent source size in steradians (sr), defined as the subtended solid angle of the source at the eye of the subject.
The four numbers are actually snapshots taken at a single frequency and single target attitude along the line of sight of four functions that vary over the entire 4[Pi] steradians of solid angle around the target.
B] is the apparent brightness temperature distribution of all sources observed by the antenna over the full 4[Pi] steradians.