A Clock.
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a clock is used to tell the time
the instruments in mathematics
Sundials were used to tell time, back without watches.
The Incas used the sun and moons position in the sky to tell time
In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are also used to measure time in some sports.