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## Homework Statement

given that T(sun)=5771.4, S(Earth)=1370, D(Earth)=1.5x10^8km, R(sun)=7x10^5km

calculate the radiance of solar radiation at earth orbit

## Homework Equations

Irradiance=Radiance/Solid Angle

Solid Angle=Area/Distance^2

I=sigma*T^4

## The Attempt at a Solution

Radiance=1370/solid angle... but how do i find the solid angle... i get answers thats are very large... but im as confused as hell what to use