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QUDT VOCAB Quantity Kinds Release 2.1.25
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quantitykind:SolidAngle
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http://qudt.org/vocab/quantitykind/SolidAngle
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Solid Angle
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http://dbpedia.org/resource/Solid_angle
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The solid angle subtended by a surface S is defined as the surface area of a unit sphere covered by the surface S's projection onto the sphere. A solid angle is related to the surface of a sphere in the same way an ordinary angle is related to the circumference of a circle. Since the total surface area of the unit sphere is 4*pi, the measure of solid angle will always be between 0 and 4*pi.