7 Day Week

The 7 Day Week is used by the majority of the world and is the international standard as specified in ISO 8601.
Origins
Astrology
It could be due to the 7 stella objects visible to the naked eye; The Sun, the Moon, Mars, Mercury, Jupiter, Venus and Saturn. Originally thought to orbit the center of the universe; Earth.
Or even dividing the lunation into four; Full Moon, First Quarter, New Moon and Last Quarter. is nearly 7 days each.
Either way it was Astrology that originally influenced the 7 day week we have today.
Sumerians
The 7th, 14th, 21st and 28th day of the lunation were 'evil days' or 'holy days' for the people of Sumer and each of the four attributed to a god. Additionally the 19th day was the 'week of weeks', 49 days (7 x 7) from 1st day of the previous [ and also attributed to a god.
But this was not a continuous 7 day week like we have today. After the 4th week when the moon was dark (New Moon) there were 1 or 2 days to keep in line with the lunation of around 29.5 days before the new cycle of 4 7 day weeks began.
Jews
The Jews invented the continuous 7 day week in 586BCE during the Babylonian Captivity In Creation according to Genesis God created the heavens and the earth in 6 days and rested on the 7th. It's not known when the Tanakh was written (see ).
The influence of these 7 days of creation were the beginning of the continuous 7 day week. As Genesis originated from Mesopotamian mythology it's likely it was an evolution of the Sumerian 7 day week.

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