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The Plimpton 322 tablet is a Babylonian clay tablet, written in cuneiform, from around 1,800 BC (now held at Columbia University). The tablet contains four columns of numbers, written in base 60 (a system that survives in our hours, minutes, and seconds):
The Babylonian Clay Tablet Plimpton 322 before Iphone & Ipad 1,800 BC.
A close up of a rounded corner.
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