Why is 7 days a week?

The reason comes from ancient Babylonians.

Roman Emperor Constantine formalized a 7-day week in 321 AD.

When studying the lunar cycle, the Babylonians realized that, about every 7 days, the Moon changed phase again, thus the idea of ​​a 7-day week came up .

In addition, 7 is considered a mystical figure involving 7 bodies: Moon, Earth and 5 planets (symbolizing the Five Elements).

The number 7 is also sacred to the Jews when the 7th day is to rest and worship.

Finally, in 321 AD, the Roman emperor Constantine formalized 7 days a week and named the days of the week according to Roman gods like Saturday (Saturday), according to Saturn, Thursday ( Thursday) is based on Thunder god (Thor), or Friday (Friday), set by Goddess Freya .

Finally, a 7-day week is standardized and adopted worldwide.