Keeping time The origin of BC and AD During what period did the calendar invented?
At what time was the timetable initially devised?
In which period did the timetable emerge?
In what period did the calendar initially created?
In which period did the schedule initially conceived?
At what time was the agenda firstly devised?
In what period did the schedule inception?
When did the calendar arise for the first time?
- 04/13/01:39
- The Calendar System
