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Effective Earth radiusIn telecommunication, effective Earth radius is the radius of a hypothetical Earth for 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 Earth radius. Source: from Federal Standard 1037C and from MIL-STD-188 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Effective Earth radius".