Question

solar constant formula

Answer 1

The specific value at Earth of 1,361 W/m2 is called the "solar constant". In order to calculate the total amount of energy arriving at Earth, we need to know how much area is being lit. We then multiply the area by the insolation (in units of energy flow per unit area) to find out the total amount of incoming energy.

Answer 2

SOLAR CONSTANT =   sigma*T^4(R/r)^2

......where sigma is the stefen boltzman constant = 5.67*10^-8

                 R is  the radius of sun

                 r is the distance of earth from sun....  

                 T is the absolute temperature.