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dec 8, 19986 BC - Ancient Sumerians created the sundial.

Description:

This used 12 hours per rotation, just like our clocks today. They used 12 hours because it fit nicely into 360 degrees. Also, dividing it down fit evenly into it.

Added to timeline:

14 Sep 2017
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Date:

dec 8, 19986 BC
Now
~ 22027 years ago

Images: