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The radius of the sun is about 10^6 km...

The radius of the sun is about `10^6 ` km yet it looks like a disc why?

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The distance of sun from the earth is about `10^8` km. So the visual angle subtended at the eyes of a man on the earth is `(10^6)/(10^8)=0.01` rad. Since this value of the visual angle is very small, the sun looks like a disc.
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