Tower clocks are available since the 13th century, and pocket watches since the 16th.
this post was submitted on 21 Oct 2023
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They used clocks and watches, and they set their clocks against more accurate central clocks.
how did this work on time zones?
Same as it does now. You either set your watch to the local time, or you set it to standard time, such as GMT.
Set on noontime
And central clocks would be set at noontime usually
Most people didn't really care about being too precise, it was normal for different clocks and watches to be up to 10 minutes apart.
If you were an astronomer, railway worker, navigator, or someone else who needed to be precise, determining noontime precisely was pretty basic and could be done daily.