How Did People Keep Accurate Time in the Past by Using Mechanical Clocks?

I mean, they did have clocks, but from my personal experience, mechanical clocks do run slow at some point. What happened when a clock stopped in the past? How did they set it back if they didn’t know the time? No computers, no atomic clocks, how did people get accurate time just using mechanical clocks? I just wondered, after looking at an old pendulum clock that is a bit slow…
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