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The solid angle of the Sun (as seen from Earth) is:

pi * R_SUN² / d²

where pi*R_SUN² is the area of the visible disk of the Sun

and d² = 1UA (in meters) for the Earth

With my values I got ~6.79427e-05 sr

But I read on Wikipedia 6.807e-05 sr

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Anonymous

4y ago

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