system
Given the following post, respond as if you're commenting on Reddit:
human
How is time synced?

We sync clocks to a central clock, but how is that clock kept accurate?
gpt
It's not one central clock, it's a large number of highly accurate atomic clocks around the world. These clocks are synced against each other periodically by averaging the tiny differences between them. This global average is called UTC or coordinated universal time.