Effective Earth radius
telecommunication, effective Earth radius is the radius of a hypothetical Earthfor which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth with an assumed uniform vertical gradient of atmospheric refractive index.
"Note:" For the standard atmosphere, the effective Earth radius is 4/3 that of the actual
Federal Standard 1037Cand from MIL-STD-188
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