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Q&A How far can civilization go without inventing the calendar?

While only counting seasons and years, but not weeks or months, how far can human civilization progress? Can they reach the middle ages? Or is the invention of the calendar such a cornerstone of ...

3 answers  ·  posted 6y ago by Mindwin‭  ·  last activity 6y ago by Mindwin‭

Question civilization time-keeping time earth history ancient-history