2017年04月 / Mesoamerican calendars Wikipedia
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History of calendars Wikipedia
2017年04月14日(金)
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At what time did the calendar originated?
In what period did the calendar initially devised?
In which period did the calendar emerge?
When was the timetable firstly devised?
During what period did the schedule firstly envisioned?
During what period was the schedule firstly created?
During what period did the timetable creation?
During what period did the agenda emerge for the first time?