Question

When the first clock was invented,how did the clockmaker decide on the time?
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Answer 1

As others have said, the position of the sun can determine the time. For example, the sundial was around before the clock. So a clockmaker could consult a sundial to set the clock. High noon is a good measurement.

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Answer 2

Answer:

I had read this just couple of days ago

clockmaker decided the time of clock by other methods of finding time like sundial ,etc. so lock it