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What is the solid angle subtended by the...

What is the solid angle subtended by the moon at any point of the Earth, given the diameter of the moon is 3474 km and its distance from the Earth `3.84xx10^8` m.

Text Solution

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Solid angle subtended by the moon at the Earth
` = ("Area of the disc of the moon")/((" moon -earth distance")^2)`
`= (pi xx (1.737 xx 10^3)^2)/((3.84 xx 10^5)^2)`
` = 2.045 xx 10^(-5) sr`
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