Which country was the first to use 7 days-long week?
Ancient Greece
Ancient Egypt
Ancient India
Babylon
The seven-day week has deep historical origins in the astrology of Ancient Near East, being approximately a quarter of a lunation. It was (independently) adopted by the Persian Empire, in Judaism and in Hellenistic astrology, and (via Greek transmission) in Gupta India and Tang China.
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Answers by country
Ancient Greece
Ancient Egypt
Ancient India
Babylon
answers

15

13

13

68

5653

18

31

114

10

11

28

70