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body B, of a particular mass and expanse, comes into nearness so as to have any influence on the body A and if at that time B is also moving then its velocity, mass and direction of motion will have a particular effect and influence on the movement of A. Also if B be stationary then also it will have its influence over that of A. These influences may be very small or large, or from zero to any appreciable value.
If a particle is projected, say vertically, and another particle is projected horizontally, in such a way that after gaining sufficient speed and acceleration, at a particular time they come very close to each other, then their path may get slightly diverted and speed may also be affected, at that moment and point.
Every motion of every planet affects the motions of all other planets. So their motions are not only Relative”but "Closely Related" too,
Take for example the motion of our earth. It is what is at present as influenced by the influences and forces exerted upon it
