【More・・・】
The Mesoamerican Calendar Ancient Shared Time KeepingAt what time was the timetable originated?
In which period was the timetable first introduced?
In what period did the schedule come into existence?
In which period was the agenda
originally devised?
In which period was the timetable initially thought up?
In what period did the schedule initially established?
In what period was the schedule creation?
In which period was the calendar come about for the first time?