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How will measure the diameter of the Moo...

How will measure the diameter of the Moon using parallax method?

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Let AB = D be the diameter of the moon which is to be measured from the earth by an observer A.

A telescope is focused on the moon and the angle AOB is found.
`"Since "theta=("Arc")/("Radius")=(D)/(S)`
`therefore D=S.theta`
i.e., Linear diameter = Distance `xx` Angular diameter
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