Bet You Won't Believe This !

[This'nThat]

Originally Posted by Ironfish

"NOT" ...Check your math!.

Rattlesnake Guy's math is quite correct. You'll need to show your exact formulas if you want to challenge him, IMO.
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Actually, the earth's curvature is an integral part of the calculations, and is represented by the earth's Diameter in the formula. The Line of Sight calculation is really simply a tangental formula. Once the tangent is marked along the curvature, the actual formula is the simple Pythagorean algorithm.