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The first clocks made were not very complex. They did however not keep track of time very accurately either.

A solar clock is as easy as putting a stick in the ground and watch where the shadow falls. Not considered very complex at all and only useful at daytime without too much cloud cover.

Modern clocks is advanced science. Some clocks/watches will give you the accurate time within a second for many many years.

Some scientific time-devices can run for thousand of years (with needed maintenance) and not be off by more than a fraction of a second.

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15y ago

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