Answer:
There were no electronic watches in earlier days. The earliest method of measuring time was based on the position of the Sun. The Sundials were used for this purpose. Time was measured by the shadow cast by the changing position of the sun from day to night. Chinese made a water clock 6000 years ago. Sand clock was also used to measure time. Sand clock was used by Romans. The time taken by sand to fall into the lower chamber from the upper chamber was considered to be the unit of measuring time. The discovery of pendulum helped in determining the exact time before the electronic watches were invented.
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