In 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.
The drawbacks to red squill, compared to zinc phosphide, are that it is effective only against the Norway rat, is generally less acceptable by all rats, has poor reacceptance after sublethal intake, has less overall killing effectiveness, and is not readily available for purchase.
It is not considered effective enough for house mice or roof rats.
They are effective against both rats and mice and, when used at the recommended level, bait shyness is not developed.
The radius of Earth (or any planet) is the distance from its centre to a point on its surface at mean sea level.
The Earth's polar radius, or semi-minor axis, is the distance from its center to the North and South Poles, and equals 6,356.750 km (≈3,949.901 mi; ≈3,432.370 nm).
It is this radius that would be used to approximate the ellipsoid's average great ellipse (i.e., this is the equivalent spherical "great-circle" radius of the ellipsoid).
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