Quoting from a previous abstract of an article of the present authors [A. Biswas and K. R. S. Mani, Phys. Essays 30, 421 (2017)]: "Einstein stated two dictums, so that more experimental facts can replace the previously adopted hypotheses and General Relativity (GR) can evolve to 'grand aim' or perfection. In the absence of appropriate experimental facts during pre-CEREPAC (Century-long Experience of Relativity-related Experiments on Physics, Astronomy and Celestial-mechanics) era, Einstein found no 'escape' from the consequence of non-Euclidean geometry, while keeping all frames permissible based on contemporary knowledge. Bergmann also stated in 1968 that the 'principle of general covariance' has brought about serious complication in GR. During CEREPAC, relativists and mathematical-astronomers invariably identified the appropriate 'nature's preferred-frame', which was later found essential for operation of conservation laws. Based on CEREPAC, replacing the experimentally unverifiable hypotheses with experimentally proven principles, and improving upon the GR-astronomers model (developed by JPL, USA, as an evolved-version of GR-conventional model) in two successive stages, GR was remodeled to what became evident as Evolved General Relativity (EGR), after it enabled the elimination of all earlier-adopted 'ad-hoc' methods or approaches, and of the problems, paradoxes and anomalies, associated with the applications of GR, during CEREPAC, and after it unraveled the 'General-relativistic nature of speed-of-light (c)' which links the variable c(r) with F-r, the local Gravitational Red-Shift Factor (as stated by Einstein between 1911-21). Consequent to the space-age developments in numerical simulation and in the availability of precision observational data, it got proven that nature itself operates the conservation laws of energy, and of linear and angular momentums (both magnitudes and directions), with respect to the appropriate 'nature's preferred frame'; this provided sufficient reason for giving up the 'relativity of all frames', bringing back Euclidean geometry in EGR." Euclidean space in EGR enabled development of a Prototype of future Ephemerides, leading to five orders-of-magnitude improvement in accuracy of computation of the various components of precession of Planetary orbits, using three independent methods: the first method calculates Total precession alpha(ExV) in a model-independent way, Directly from the Prototype Ephemeris; the second method computes alpha(Drn), applying the Conservation Law of magnitude of the Orbital Angular Momentum, M theta, and adds a small precession theta(G) governed by the conservation law of direction of linear momentum vector, v, so as to match alpha(ExV), up to 0.1 Micro-arcsecond (mu as) accuracy; and, the third method computes Orbital precession theta(P) to match alpha(Drn), by envisaging an elliptic orbit that precesses over the orbital plane, and simultaneously swings due to its phi-rotation, governed by the respective conservation law of magnitude of the angular momentums, M-theta and M-phi. By closely matching the alpha(ExV) generated from model-independent method, EGR proved that it has been able to unravel the nature's methodology for conservation of linear and orbital angular momentums. The prototype ephemeris leads to a two-step methodology to generate a new ephemeris by doing simultaneous angular momentum conservation for both M-theta and M-phi, while simultaneously doing LSA (least squares adjustment) using precise observational data; and, then using this new Ephemeris, run the EGR program for planetary orbits, to determine the accuracy level of theta(P) using its "three-methods-match." (C) 2019 Physics Essays Publication.
