During what period was the agenda originated?
At what time did the calendar first established?
At what time did the schedule emerge?
During what period did the calendar originally invented?
In which period did the schedule originally thought up?
In what period did the schedule initially established?
In what period did the timetable inception?
At what time did the calendar come about for the first time?
Calendar Ancient Religious Systems
- 04/13/01:39
- The Maya Calendar System Smithsonian Institution
