if theta is the parallax angle of a planet at distance 'D', when observed from 2 different positions on the earth, separated by distance 'b', the expression for 'D' is?
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Explanation:
since theta is very small
it can be assumed as an arc of a circle
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if theta is the parallax angle of a planet at distance D when observer from 2differnt position on the earth, separated by distance b the expression for D is
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