In what period did the schedule created?
When was the calendar initially introduced?
In which period did the timetable emerge?
At what time did the timetable firstly devised?
During what period was the schedule firstly thought up?
In what period did the calendar firstly devised?
During what period was the agenda inception?
When was the schedule emerge for the first time?
- 04/13/01:39
- Mesoamerican calendars Wikipedia
