This note makes straightforward use of the well known apsidal equation (1) to give orbital precessions and trace their origin to vacuum fluctuations. Firstly, for the sake of reference only, the orbital precession of the obsolete Einstein theory is obtained very simply. It is then shown that EGR is a special case of ECE2, one in which the isotropically averaged vacuum fluctuation is given by Eq. (26). So vacuum fluctuation is the origin of Einsteinian general relativity. However that theory is totally wrong and has been refuted many times by the famous UFT series. ECE2 is based on the correct geometry and is much simpler and powerful than EGR. Finally the apsidal method is used to give the ECE2 precession at the perihelion, Eq. (48). Any precession is given by Eq. (47) in the limit of small eccentricity. For eccentric orbits such as those of comets, the ECE2 equation must be integrated numerically. Vacuum fluctuations give rise to relativity itself in one way of thinking.