Thus the repelling power of the radiating electro-magnetic Aether waves has to overcome, not only its exact counterpart, the centripetal force, but also the onward motion of the sun as it rushes on its course through space. This the centrifugal force is unable to do, with the result that the distance is gradually lessened, and instead of the Earth describing the arc _E_ _D_, it describes the arc _E_ _F_, at which point its distance is at the minimum, or about 91 millions of miles. Or, to put the same fact in another way. When the Earth is at _E_, the centripetal force and the orbital velocity of the Earth and the sun are acting conjointly, with the result that they overcome the centrifugal force, and the distance is gradually decreased. This decreased distance means an increased aetherial density and an increased velocity of the aetherial currents, with the result, that as the distance is decreased, the orbital velocity of the Earth is gradually increased, so that by the time the Earth gets to _F_, at its perihelion, it has now acquired its greatest orbital velocity, and is carried round the sun by the electro-magnetic Aether currents at its maximum velocity. Now let us look at the Earth being circled round the sun by the electro-magnetic Aether currents as it goes on to perform the other half of the orbit. In this case we have the orbital motion of the sun and the centrifugal force working conjointly, with the result that together they overcome the centripetal force, and the Earth is repelled and carried beyond its mean distance. Let _S_ represent the sun, the Earth being at point _C_ of its orbit, after passing round its perihelion, and at this decreased distance it is carried along by the circulating and denser Aether with its maximum velocity (Fig. 26). Now while the Earth is going on to describe the half-circle _C_ _G_ _E_, the sun is still pursuing its journey at the rate of about 18,000 miles per hour, only this time in a direction away from the Earth. As, however, the Earth has not yet regained its mean distance of 92,000,000 miles, the centrifugal force is still greater than the centripetal force, so that the centrifugal force is urging the planet away from the sun with greater intensity than the centripetal force is attracting it, as the two forces are only in equilibrium at the mean distance of the Earth.