The Mesoamerican Calendar article
During what period was the timetable invented?
When did the timetable initially devised?
In what period was the schedule come
into existence?
During what period was the agenda firstly created?
In which period did the timetable initially thought up?
In what period did the calendar initially created?
At what time did the timetable creation?
When did the agenda arise for the first time?
