27.
The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

28.
Right ascension of a heavenly body is its equatorial angular distance measured

29.
α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is

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