Question

How is time marked in history?
Please answer in short. if you answer in short in your own words , so I will mark you as brainlist​

Answer 1

Explanation:

For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC from the Sumerians. The Egyptians divided the day into two 12-hour periods, and used large obelisks to track the movement of the sun.

Answer 2

the concept of BC and AD was introduced by historians to measure the period in history