MrBiGG

Referring to your original question: What we have, so we have been told by Einstein and Minkowski, is not space plus time as separate entities, but as a 'space-time' continuum to be considered as one entity.

What you are now discussing sounds quite different from the 'atemporal' idea:

"Why does yesterday, or a second ago no longer exists today, at this moment called 'now'? The sum of all the energy/mass particles in the universe are still the same. Every single particle still exists in some form in a different location in space. Therfore would we say that yesterday is gone because of the passage of time or because particles moved from it's previous known location?"

Yes (twice). The passage of time and the motion of a particle are inseparable, but I think there are two parts to the answer. Firstly, as you say, since yesterday or a moment ago the space-time coordinates for every particle (or String?) in the cosmos have changed. Secondly, we experience time, by virtue of the nature of our consciousness and memory, as progressing from past to future.


"Time is what prevents everything from happening at once" - John Wheeler