On: A Black Hole Threw a Star Out of the Milky Way Galaxy

[pbhjpbhj]

Sounds to me like you could have equally started that post with "UTC is not a global clock".

[isostatic → pbhjpbhj]

It's a global clock. UTC is the same time in Miami as it is in Singapore.

The accuracy of the delivery of that timesource is 10ns in theory, and upto 1000ns in practice.

[pluma → isostatic]

CET and EST are also the same time in Miami as in Singapore. That's just how time zones work. The distinction with UTC is that it isn't tied to any particular physical location, it's not the "time zone" for anywhere.

But UTC is ultimately defined by consensus. We need a reference clock and we need to be able to measure or estimate our skew in order to sync to it.