Mesoamericans Have Been Using a 260Day Ceremonial Calendar In which period was the timetable invented?
In what period
did the timetable first devised?
At what time was the calendar come into existence?
When did the agenda initially invented?
In which period was the calendar firstly conceived?
In what period was the schedule firstly created?
In which period was the calendar generation?
When did the timetable arise for the first time?
