Question

what is the impact of the curvature of earth
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Answer 1

Answer:

Curvature of the earth: The earth appears to “ fall away ” with distance. The curved shape of the earth means that the level surface through the telescope will depart from the horizontal plane through the telescope as the line of sight proceeds to the horizon. This effect makes actual level rod readings too large by:

Curvature and Refraction -

Answer 2

Answer:

In extreme cases, where temperature increases with height and dry air overlays warm air, (a condition often found along coastlines), the beam can bend down dramatically and even strike the ground. Meteorologists call this effect "anamolous propagation".