Conversation

Remember kids, time is fake

But modern technology can’t deal with flowy time like this. As a result, the timekeepers at Boulder and elsewhere make corrections to ensure these different flows of time look like they’re ticking in lockstep. The same goes for satellites farther from Earth, like those that make up the Global Positioning System. The system works by measuring the time difference between several satellites carrying clocks in space to the time that people measure on the ground.

https://www.npr.org/2022/12/16/1139780043/what-is-time-physics-atomic-clocks-society