Linked from
The 38 pages that link to Inverse-square law, each with the reason it gives.
Standard candleRelated: It converts a candle’s luminosity and observed brightness into distance.
Gravitational forceRelated: Newtonian gravitational strength falls with the square of separation.
Radiant intensityRelated: It converts source intensity into irradiance at a distance.
IrradianceRelated: It predicts how irradiance from a compact source falls as a surface moves away.
RadiometryRelated: For a point source, it links radiant intensity to irradiance with distance.
Solar constantRelated: It explains how solar irradiance changes with distance from the Sun.
Fifth forceRelated: Short-range tests look for departures from gravity's inverse-square behavior.