As shown, the earth's mean radius is about 6378 km, while the altitude and orbit radius of a GSO satellite is approximately equal to 35786 km and 42164 km respectively.

So, that's actually a great circle meridian of length, well, I mean, well, the radius is the radius of the sphere.

Based on the parameterized fully dressed quark propagator, we study the momentum dependence of the nucleon static properties and mean squared radius of nucleon in QCD.