This was a hard-earned insight I still chase.
It is indeed a matter of great difficulty to discover and effectually to distinguish the true motions of particular bodies from the apparent, because the parts of that immovable space in which these motions are performed do by no means come under the observations of our senses.-Newton Epitomime for more on this - Cut to the chase: Theory was overthrown by Mach and then Einstein. The above is the result of an August vacation many years ago.