Hi, So, I understand the concept that the power radiated by the sun spreads out as a sphere with a radius equal to 1 AU. Therefore, in order to find the intensity, we have to divide the power radiated by the surface area of the sphere. I thought the result of this calculation would yield the intensity per meter squared, that is, in an area of 1 m by 1 m on the surface of the Earth. However, I was reading some websites and I got really confused. They claim 1380 Wm-2 is the solar constant provided we treat the Earth as a sphere but 340 Wm-2 if we consider only a "disc" is receiving the energy at any given point. So, is 1380 Wm-2 received at every point on Earth or the Earth itself receives 1380 Wm-2? Thanks!