2017年04月 / A Brief History of Time and Calendars MacTutor History of
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2017年04月14日(金)
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In which period was the schedule originated?
In what period was the timetable initially devised?
In which period was the agenda arise?
In which period did the agenda firstly created?
During what period did the calendar initially envisioned?
When was the calendar initially created?
In which period was the calendar creation?
During what period was the calendar arise for the first time?