In what period was
the timetable invented?
During what period was the calendar first devised?
During what period did the calendar emerge?
During what period was the agenda originally invented?
During what period did the calendar originally envisioned?
In which period was the schedule initially established?
At what time did the agenda generation?
When did the agenda arise for the first time?
Mesoamericans Have Been Using a 260Day Ceremonial Calendar
