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[–] 18251105? 0 points 3 points (+3|-0) ago 

The formula of (8HH)/12 is incorrect. BTW. I've plotted Earth "drop" to 6 decimal places using the common Earth dia of 7910 (mid point between equatorial and polar diameters) and that calculation is way off. An example is at 103.541658 arc miles of distance, the calculation shows a "drop" of 7,147 feet. The correct math states this to be 1,789 feet. The drop is far less than the commonly referred to calculation indicates.