2017年04月 / Mesoamerican Calendars and Archaeoastronomy
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In what period did the schedule created?
In what period was the calendar initially introduced?
During what period was the timetable arise?
In what period was the schedule originally created?
During what period did the calendar firstly envisioned?
At what time did the timetable firstly introduced?
At what time did the agenda inception?
When did the timetable come about for the first time?