2017年04月 / When was the current BC
12345678910111213The History of Calendars and How They Evolved Calendar15161718192021222324252627282930Mesoamericans Have Been Using a 260Day Ceremonial Calendar
The Mesoamerican Calendar Ancient Shared Time Keeping
2017年04月14日(金)
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In what period did the agenda invented?
When was the schedule first introduced?
During what period was the calendar come into existence?
When did the agenda initially created?
During what period was the agenda firstly conceived?
In which period was the agenda firstly established?
In what period did the timetable inception?
At what time did the agenda emerge for the first time?