Mayan calendar
The Mayan calendar was a sophisticated calendar used by Earth's ancient Mayans. 

In the ancient past, a being known as Kukulkan gave the Mayan civilization a remarkably accurate calendar, according to which the Mayans were supposed to build a city according to its cycles. After the city was finished, Kukulkan was supposed to return, so the Mayans built their city and waited, however Kukulkan never appeared. ()

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Culture
Time measurements