The ECE2 force equation gives the very simple result (35) in the same approximation as used in Note 403(1). There does not seem to be an analytical solution to Eq. (20), but this approximate method shows that it produces precession of the half right latitude. Any experimentally observed orbital precession can be explained exactly by adjusting the spin connection, so any precession can be explained exactly by the vacuum in a very simple way. Maxima can be used to find the numerical solution of Eq. (20). By Ockham’s Razor this theory is preferred for small precessions to all more complicated theories. In the next not I plan to apply the successive approximation method to Eq. (20), but the best solution is the Maxima solution, using its numerical integration routines.Finally we have traced the origin of teh spin onnection to vacuum fluctuations of the type used in Lamb shift theory, which also gives a precise match with experiment.