Combined Gravitational Action (V): Extension

In a series of papers related to the Combined Gravitational Action (CGA) as an alternative theory of gravity, we have developed the CGA-formalism, which is exclusively based on a new form of velocity-dependent gravitational potential energy. The present paper is an additional exploration, exploitation, and extension of the CGA with the main aim of showing: (i) the Galilean invariance of CGA-equations; (ii) that the CGA is, in a certain manner, a metric gravity theory; (iii) the existence of an important similarity between the CGA and General Relativity Theory; (iv) a new CGA-formula for perigee and perihelion precession is derived and proved to be in excellent agreement with observations; (v) the CGA-effects on orbital motion inside and outside the Solar System are investigated; (vi) the conversion rate of orbital energy into gravitational radiation is calculated, and its effects are studied.