The Maya developed the Long Count Calendar.
Sources
- Drought May Have Spelled End for Maya | HISTORY (history.com)
- https://maya.nmai.si.edu/calendar/calendar-system (maya.nmai.si.edu)
- https://www.timeanddate.com/calendar/maya.html (timeanddate.com)
- https://kids.kiddle.co/Mesoamerican_Long_Count_calendar (kids.kiddle.co)
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