- the amount of heat from the Sun (solar insolation)
- the albedo (A) of the planet (A is the fraction of sunlight reflected by the planet)

To determine the temperature from the amount of light, we use the Stefan-Boltzman law:

Flux = sigma x TThus, the temperature is proportional to the fourth root of the flux,^{4 }where

sigma = Stefan-Boltzman constant

T = temperature (degrees Kelvin)

T ~ F^{1/4}