The Maya Calendar System Smithsonian InstitutionWhen did the timetable invented?
In what period did the schedule first devised?
In what period was the calendar arise?
During what period did the schedule originally created?
In which period was the timetable originally imagined?
During what period did the timetable firstly created?
In which period did the timetable inception?
In which period was the schedule come about for the first time?