Linked from

The 25 pages that link to Solid angle, each with the reason it gives.

• RadianCompared with: Its SI unit, the steradian, extends the radian’s geometric ratio to spherical surfaces.

• AngleCompared with: It generalizes planar angle to directions occupying space.

• Inverse-square lawRelated: A fixed solid angle covers area proportional to distance squared.

• LuminanceRelated: Luminance is defined per unit solid angle, specifying how much light travels in each direction.

• Numerical apertureRelated: The accepted cone of rays can also be described by its solid angle.

• IlluminanceRelated: A source's apparent extent helps determine the flux arriving at a surface.

• Radiant fluxRelated: Radiant intensity relates flux to the solid angle over which it travels.

• Radiant intensityRelated: It supplies the directional area over which radiant power is counted.

• Luminous fluxRelated: Luminous flux from a source relates its intensity to the solid angle it covers.

• RadianceBroader topic: It specifies the directional spread over which radiance is measured.

• Dihedral angleCompared with: A solid angle spans directions in space rather than measuring the orientation of two planes.

• Radiative transfer equationRelated: Radiation intensity and scattering are resolved over directions in solid angle.

• RadiometryRelated: Radiant intensity and radiance specify power relative to a solid angle.

• Spectral radianceRelated: It specifies the directional spread of the radiation being measured.

• Angular diameterCompared with: Solid angle describes apparent extent in two dimensions; angular diameter gives one width.

• Electric fluxRelated: For a point charge, flux through a patch depends on the solid angle it subtends.

• Luminous intensityRelated: Intensity is luminous flux emitted per unit solid angle.

• CandelaNarrower topic: Luminous intensity is defined relative to solid angle.

• Optical theoremNarrower topic: Scattering cross sections are distributed over outgoing directions measured by solid angle.

• SteradianNarrower topic: The steradian is the SI unit used to measure this quantity.

• Integrating sphereRelated: Port and detector geometry determines what fraction of the sphere's radiation is sampled.

• CandlepowerRelated: Luminous intensity is defined per unit of this angular spread.

• Square degreeNarrower topic: A square degree is one unit for measuring solid angle.

• Stefan–Boltzmann constantRelated: Angular integration over emitted directions enters the derivation of the constant.

• Ligand cone angleCompared with: It is a spatial alternative to expressing a ligand’s steric envelope as a planar cone angle.