You accepted that the force moving magnets can be inferred from visible movement. That is the method I am using too.
You, me, anyone — distinctions. Normal and abnormal — distinction. Sight and blindness — distinction. These are all instances of difference.
Capacity for distinction — the condition that makes any of those instances possible at all. Not this distinction or that distinction. The fact that distinction can exist.
Can it stop being possible? I cannot find where. Can you?
If you can find a boundary where distinction becomes impossible — what is on the other side of that boundary?
And if you cannot find that boundary — what do you call something that has no boundary?
You said time is perception of motions and movements. Motion requires change. Change requires something being different from what it was. Different requires distinction. So before the first distinction — no change, no motion, no time.
So what allowed the first distinction to appear?