Problem - 2.1: From two diametrically opposite points
A and B on earth, moon is observed. The angle 0
subtended at the moon by the two directions of
observation is 1°54'. If radius of earth is 0.638 x 10 m,
find the distance of the moon from the earth.
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Answer:
=1°54
′
=114
′
=(114×60)"=114×60×4.85×10
−6
rad=3.32×10
−2
rad
Basis,b=AB=1.276×10
7
m
So,the distance of the moon from the earth,
S=
ϕ
B
=
3.32×10
−2
1.276×10
7
=3.84×10
8
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