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Explain method for measurement of dimension of a planet or star. |
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Answer» Solution :Angular diameter: From a point on surface of the earth angle subtended at diameter of the earth is called angular diameter `(alpha)`. Let diameter of the earth is d. As shown in figure from point of observation on surface of the earth a can be obtained at diametrically opposite point. DISTANCE between the earth and planet (Star) is D.  `alpha=(d)/(D)` (radian) isused to MEASURE diameter (d) of the planet. `I^(@)`(degree) =60. (MIN) I. (min)=60.. (SEC) `I^(@)=3600..` (sec) |
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