Greg London has provided an interesting method to determine an answer to this Quora question. read more
The Earth has a radius of approximately 3965 miles. Using the Pythagorean theorem, that calculates to an average curvature of 7.98 inches per mile or approximately 8 inches per mile (squared). The distance to the horizon in miles from height of an observer is approximately equal to 1.23 times the square root of the height in feet. read more
Earth Curve Calculator. This app calculates how much a distant object is obscured by the earth's curvature, and makes the following assumptions: read more