A Brief History of Time and Calendars MacTutor History of
Mesoamericans Have Been Using a 260Day Ceremonial Calendar
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The Maya Calendar System Smithsonian Institution
In what period did the calendar invented?
In which period did the schedule initially established?
In which period was the calendar arise?
In which period did the timetable firstly devised?
In which period was the calendar originally thought up?
At what time was the agenda firstly established?
In what period did the timetable creation?
In which period did the timetable emerge for the first time?