1. The problem statement, all variables and given/known data "Determine a surface temperature value for the Sun from the angular diameter of the Sun and the solar constant." 2. Relevant equations L=4π(R^2)σT^4 3. The attempt at a solution At this point my only stumbling block is I don't understand the relationship between the solar constant and luminosity. edit: Is it as simple as multiplying by the square of the distance?