2017年04月 / Mesoamerican Calendars and Archaeoastronomy
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When Was the Calendar Invented A Look at the History and
2017年04月14日(金)
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When was the schedule devised?
At what time was the agenda first devised?
In which period was the agenda arise?
In which period did the timetable originally devised?
During what period did the schedule firstly thought up?
When did the timetable initially introduced?
At what time was the calendar inception?
In which period did the calendar emerge for the first time?