Back in the 1800s a British-German astronomer named William Herschel told the world about infrared radiation. Then a few other guys like Josef Stefan and Ludwig Boltzmann figured out the energy exchange between two surfaces had a constant, which found its way into a now famous law called the Stefan-Boltzmann equation.ii A form of this formula can be used to calculate the net exchange of radiative heat (Qrad, Watts) between, for example, the roof of a building and the sky. Planck Law plays also a role and is a strong negativ Feedback. chap2
