Copy of How much the bottom of an object is obscured by the horizon
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(all workings in feet)
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Distance between points in miles20
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Height of observer in feet (h)45
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Distance between points in feet (d)105600
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Distance to horizon in feet (a) =sqrt((r+h)^2 - r^2)43374.17
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Distance to horizon in Miles8.21
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Radius of earth in miles3959
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Radius of earth in feet (r)20903520
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Bottom of target obscured (x) in feet =sqrt(a^2-2ad+d^2+r^2)-r92.62
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