[SOLVED] Solar Constant Question? Define Solar constant and Albedo of a planet. Calculate the solar constant for mars and hence evaluate the theoretical equilibrium surface temperature. You may ignore the greenhouse effect in your calculations. The sun has a temperature of 5777 k and a radius of 6.96 *10^5km. The sun-mars distancy is 2.28*10^8 km. The albedo of mars is 0.16. MY ANSWER Ok I know that the solar constant is the mount of energy asorbed my a planet per m^2. And also that the albedo of a planet is the amount of light energy which is absobed (not reflected) by the atmosphere. I can work out the Solar Constant using: S = q*(R/Des)^2*^4 S = 588.5 W/m^2 But I have not idea of what is meant by the equilibrium surface temp or how I go about working this out. Any help would be apretiated. Thanks.