How do we actually know what the time is? Is there some “master clock” that all time zones are based on? And if so, what does THAT clock refer to?

Question

EDIT: I believe I have kicked a hornet’s nest. Did not expect this to blow up! But I am still looking for the “ur time”. the basis for it all. Like, maybe the big bang, or something.

In: 5399

Answer 1

Here’s the problem with your idea of an “ur time”… Time progresses differently depending on gravity effects. The most accurate clocks we can make will actually progress at different speeds depending on how far above sea level they are. [Here’s an article about it](https://www.likejapan.com/en/life/optical-clocks-skytree/)

Time is relative so there can be no “ur time.”