![similarity between magnetic force and gravitational force similarity between magnetic force and gravitational force](https://www.sciencefacts.net/wp-content/uploads/2020/11/Electrostatic-Force-vs-Gravitational-Force.jpg)
In this paper Gerber gave an explanation of the anomalous precession of the Mercury's perihelion in terms of a velocity-dependent potential. Secondly, we recover an ancient work of Gerber in 1898 as a precursor of the retarded theories. Firstly, in this work, we recall the calculations made by Einstein to arrive at the explanation of the anomalous precession of Mercury's perihelion. In ``On the origin of the gravitational quantization: The Titius-Bode Law'', preprint, physics/0507072, Jul 2005, a simple gravitational model based on a functional differential equation which gives a gravitational quantification and an explanation of the modified Titius-Bode law is described. The unique assumption was that the electrodynamic interaction has a finite propagation speed. In ``On the origin of quantum mechanics'', preprint, physics/0505181, May 2005, a simple atomic model based on a functional differential equation which reproduces the quantized Bohr atomic model was presented. Newtonian equations of motion, with post-Newtonian corrections, are often used to approximate the functional differential equations. As a result, the differential equations of motion in Newtonian physics are replaced by functional differential equations, where the delay associated with the finite propagation speed is taken into account.
![similarity between magnetic force and gravitational force similarity between magnetic force and gravitational force](https://philschatz.com/physics-book/resources/Figure_23_05_05a.jpg)
Action at distance in Newtonian physics is replaced by finite propagation speeds in classical post-Newtonian physics.