There is no specific date stated as to when sundials were first used.
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Sundials were used to tell time, back without watches.
Through sundials,water devices etc
They used sundials to keep track of time using the sun. At "high noon", the sun was at its highest point, and in such a position that made the stick's shadow point at 12, then every "hour" after 12, they marked the dial in the other 11 places, making the first sundial. Sundials have advanced to use a triangle with a concavely curved side, and roman numerals instead of rocks and such. Also, they couldn't have minute hands due to the fact there couldn't be a second shadow for a second object in the center.
no because its not like a clock in our days.
In olden days, they allowed people to tell the time.