A Brief History of Time and Calendars MacTutor History of In which period was the timetable invented?
During what period was the calendar first established?
In what period was the timetable arise?
In which period did the schedule initially devised?
During what period was the agenda originally thought up?
During what period was the timetable firstly introduced?
In what period did the timetable inception?
In which period was the calendar come about for the first time?
