emissivity, definition of

The ratio of the radiation emitted by a surface to the radiation emitted by a blackbody  at the same temperature.

• What is Passive Solar?
  Passive solar building design is explained and how passive solar principals are used to design green homes and buildings, and save you money.

• The Mystery of Equation 8
  I’ve been looking at the Nikolov and Zeller paper again. Among other things, they claim to be able to calculate the surface temperature Ts of eight different planets and moons from knowing nothing more than the solar irradiation So and the …...
• Earth’s baseline black-body model – “a damn hard problem”
  By Robert G. Brown, Duke University (elevated from a WUWT comment) I spent what little of last night that I semi-slept in a learning-dream state chewing over Caballero’s book and radiative transfer, and came to two insights. First, the baseline …...