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There is no specific date stated as to when sundials were first used.
Sundials were used to tell time, back without watches.
In olden days, they allowed people to tell the time.
Sundials are usually labelled using Roman numerals, so the X would represent 10 o'clock. As sundials tend to work best with sunlight, 10pm would be dark, so the X would represent 10am.
Through sundials,water devices etc