Peter
"I agree entirely about "one REAL unit of everything" particularly time. Paul seemed to miss the below too"
I missed this post. This is not how timing works. Timing is an extrinsic assessment of the rate of change between realities. So, one takes any timing device (which could be any change sequence, but it is best to have a good one, snail movement just doesn't cut it!) and counts and compares sheer number of changes irrespective of type. Which includes, obviously, a start and a finish. Therefore, as at any given point in time (start and finish), A was at spatial point X, B was at spatial point Y, or whatever is being timed. Whilst D occurred (ie number of changes in any given attribute of A), E occurred (ie number of changes in any given attribute in B). The concept of 'whilst' need not be concurrent, when one has a timing device, because that is providing a reference (ie in quartz timing devices, crystal oscillation), so the comparison can be effected even if it does not involve concurrent events.
It has nothing to do with moving with the timing device, nor is there real and apparent time. Physically, what happens is that there is a time when there was physical existence. Then there is a subsequent time when a representation (from the perspective of the sensory system, and it is known as light in the sensory system of sight) of that physical existence reaches any given appropriate sensory receptor. The delay being a function of prevailing environmental conditions through which the light travelled, and distance between the reality, as at the point in time when it occurred, and the 'eye', as at the point in time when reception of the light occurred. That is, not the distance between the two when the reality occurred, because relative movement can occur whilst the light is travelling.
This simple fact reveals an optical illusion, which many ascribe to being something more than it physically is:
As light travels, there is a delay between the time of occurrence of the existent state (reality), reaction with which resulted in the light at the same time, and the time of the receipt of that light by any given sentient organism. That delay will vary as a function of the distance involved, and the speed with which the light actually travelled in each experience (ie the extent to which environmental conditions had an impact). If there was no significant variable environmental impact, then the perceived rate of any given change in a physical sequence will remain the same, so long as the on-going relative spatial position remains constant amongst everything involved. This is because, while the value of the delay is different depending on distance, it remains constant.
However, when relative distance is altering, then the perceived rate of change alters, because the delay is ever increasing (or decreasing) at a rate which depends on the rate at which the distances are altering. It is a perceptual illusion, as the actual rate of physical change does not alter.
Paul