Currently, a central force - an apparent effort between two free bodies along the line joining them - is estimated in relativistic frames of references. Estimation of magnitude and direction of central force on planetary bodies/central body in a planetary system assumes that the centre of planetary system is static in space. While considering a satellite's orbit, centre of corresponding planet is assumed static in space. Although such calculations help to determine relative positions of the bodies, it obscures causes of many other important phenomena related to planetary motion. Determining magnitude and direction of central force with respect to an absolute reference can give us logical explanations to many puzzling phenomena on planetary motions/systems.