How About This For Accuracy!

[and hold]

Read through this fast, so maybe the remarks were made, sorry in that case.

In the question about the synchronised clocks where one of them goes on a trip: will the clocks be again synchronised when they come back together? (in the theoretical case they don't drift within their reference frame)

Nobody seems to make the remark that any digital system is a sample and hold. So wherever the marker is, between sample points it can move. But the display is a curve fit, it doesn't shows the hold.

Time doesn't move, we are only in the present, go to the future at the speed of light and leave the past behind at the same speed: the light cone.

I'm not arguing for anything.  I'm just remembering half-baked thoughts from high school and earlier - triggered by Zemlin's comment on the 1st page.  Vain imaginings, born of boredom (then, not now) - rather than the workings of excellent science.

Time seems to be defined by movement ...

[I think it's the other way around.

Does anyone remember sitting at their desk waiting for the friggin' clock to move?  There were times for me when time certainly seemed defined by the infernally slow movement of the clock's second and minute hands.

And if nothing moved, there would be no universe ...

Except in one's imagination.  Has no one, in the midst of boredom, ever imagined what the universe would look like if all movement stopped?  Has no one ever imagined they were watching and timing a rocket racing at the tip of a beam of light as it rushed from the sun to earth - wondering how time could have slowed down for the pilot when it hadn't slowed down for the one watching and timing?

All rhetorical questions, of course.
(I also used to pretend that my school desk was a helicopter that I was piloting back in cave man days ... )

[and hold]

Nobody seems to make the remark that any digital system is a sample and hold. So wherever the marker is, between sample points it can move. But the display is a curve fit, it doesn't shows the hold.

The display is a correct curve fit. It represents the DAC rate-of-change output of the system, which is the result of current steering - this can't change instantaneously. The cursor represents the midway point between two held values, and it can't move, because a movement would represent a bias towards one value or the  other, which would be quite inappropriate.

But when you consider that for most of the time, people have some form of snapping set, generally the accuracy of where the cursor ends up, when looked at in minute detail, is way different from where they thought it was anyway. But regardless of this, the midpoint between sampling points (at whatever sample rate you are using) is the finest resolution you can have from the system, and that's not going to change.