Question: Point A is between B and C . The distances of points B and C from point A are 1 0 0 0 m and

Point A is between B and C. The distances of points B and C from point A are 1000 m and 2000 m, respectively. Measured from point A, the angle of elevation of point B is 18\deg 30' while that of C is 8\deg 15'.Compute the difference in elevation of B and C considering the effects of Earth's curvature and refraction.

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