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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!