Question

who invented the time first how he know it is particular one​

Answer 1

Answer:

The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today's clocks measure. For the Egyptians, and indeed for a further three millennia, the basic unit of time was the period of daylight..

Inventors created sundials, which indicate time by the length or direction of the sun's shadow, to track temporal hours during the day.