A unit of SolidAngle.
One steradian is the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere's radius. The total solid angle about a point is equal to 4π steradian.
sr
A unit of SolidAngle.
One steradian is the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere's radius. The total solid angle about a point is equal to 4π steradian.