What is time?
I think it was Feynman who said that a great way to understand something is to look at how it's measured.
I have a system which can exist in just 2 states and it transitions between them constantly. I'll call this system a "clock" and one transition a "tick".
Now I have another system that I'm trying to study. It makes just one big transition.
So while the system makes one big transition how many ticks does my clock make?
The answer is called time.
All I'm doing is comparing two systems, the one I'm studying and the one I've designated as a reference system.
If we take this as our definition of time then such things as "time travel" are difficult to explain. To say the least.
Content written and posted by Ken Abbott email@example.com