20,000 BC: Prehistoric humans clocked on wooden sticks and bones.
8000 BC: The ancient Egyptian civilization established a 12-month calendar of 30 days a month.
In 4,000 BC, the Babylonians made a daily record.
3000 BC: The Sumerians of the two river basins divided the year into 12 months, 30 days a month, divided into 360 cycles each day, each cycle being 4 minutes.
2300 BC: China began to use the sundial.
BC 2000: The Babylonians use a calendar of 354 days per year, 29 days and 30 days a month. At the same time, the Mayans created a calendar of 260 days a year and 365 days a year.
1500 BC: Egypt invented the first mobile sundial and divided the day into 12 cycles. Then he invented a timer called Leakage. 700 BC: The Babylonians divide the day into 12 equal parts.
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