Quote:

On the contrary it is hard to eliminate the "Absolute 3d Coord system "



I might not understand you correctly, but this doesn't even exist. To determine distance differences and/or relative location you'd need to know the location of 2 (2D-distance) to 3 (3D distance+direction) 3D points. Those 3 points can have any location (value) you'd assign to them, as long it's correct in relative comparison to eachother. Even with an empty box, you'd need matter to be able to compare locations, especially when you don't know the boundaries, hence absolute locations do not exist.

In a universe that's expanding, there's no location that keeps the same coordinates, always. Simply put, a universe that's expanding can have a central point that's moving, because it's boundaries change. Off course you could simply define a location and calculate it's deviation by the expansion of the universe over time, but what good would that be when distances, time and direction are all relative to other things (matter) as Einstein figured out? An artificial grid of absolute coordinates makes absolutely no sense in my opinion.

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