20000 BC: prehistoric man to carve on the sticks and bones to timing mark way.
8000 BC: ancient Egyptian civilization has developed a calendar of 12 months of 30 days.
4000 BC, the ancient Babylonians had produced sundials to record.
3000 BC: Mesopotamia, Sumerian is divided into 12 months a year, 30 days a month, every day into 360 cycles, each cycle for 4 minutes.
2300 BC: China has begun using a sundial.
2000 BC: Babylonian calendar of 354 days per year, 29-day and 30-day round. Meanwhile, mayaren created a calendar of 260 days and 365 days a year.
1500 BC: Egypt move invented the first Sundial, divide the day into 12 periods. Went on to invent a timer called clepsydra. 700 BC: the Babylonians is divided into 12 equal parts a day.
100 BC: Athens appeared in ancient Greece based on mechanical clepsydra 24 hours a day.
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