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How will you measure the diameter of the Moon using parallax method? |
Answer» Solution :O - observation point on earth.  (i) In diagram, O is the observation point on the earth and d is the diameter of moon. An astronomical TELESCOPE held at O is focussed on moon, the image is observed into moon of a circular disc. (ii) `angleAOB=THETA` S - average distance between moon and the surface of earth. (III) As 'S' is very large COMPARED to the diameter, d of the moon, the diameter of the moon is considered as a circular arc of radius, S. `d=S times theta`. Hence d can be calculated, when 'S' is known and `theta` is MEASURED. |
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