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Jan10-13, 12:18 AM
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Please help with calculation involve solid angle.

Quote Quote by AlephZero View Post
But the surface of Mars that is radiatiing is not a flat disk, it is a hemisphere. The "brightness" as seen by the telescope will be maximum in the center and less at the edges.
Are you sure about that? It doesn't seem right to me.
yungman, is it possible that HPBW is to be interpreted as a square, not a circle?