What is the origin of seven days a week?

What is the origin of seven days a week now? Why is it so coincidentally seven days a week?

from 6000 to 4000 BC, a group of Sumerians lived on the Mesopotamian plain of the Tigris and Euphrates rivers. Through the observation of the moon, they found that from the half full moon to the full moon, the time is seven days; from the full moon to the half full moon, the time is seven days; from the half full moon to the month, the time is seven days; from the month to the half full moon, the time is seven days. It can be seen that 7 days is the cycle of the moon's profit and loss. So they divided a month into four weeks, seven days as a cycle, and named the seven days after the sun god (Sunday), moon god (Monday), Mars God (Tuesday), mercury God (Wednesday), Jupiter God (Thursday), Venus God (Friday) and Saturn God (Saturday). This is the earliest origin of the name 'week'. They also set up a god tower to worship the seven stars, believing that the seven stars were on duty in turn, each in charge of one day. After Sumer, the week system was inherited by the Babylonians.

Influenced by the civilization of the two rivers, the ancient Jews also accepted the week system. Later, with the spread of the concept of Jewish religion in Europe. "Monday" "Tuesday" & hellip; & hellip; is also colloquially called "Monday" "Tuesday" & hellip;, Sunday is called "Sunday", and a week is also called a "week".

By the way, the start time of a week is not exactly the same in different regions. Most European countries take Monday as the first day of the week. China is also used to taking Monday as the beginning of the week. Japan starts on Sunday and Egypt starts on Saturday. But international standards have set Monday as the first day of the week.

The calendar of seven days and one week has met some challenges from the government: during the French Revolution, there was a system of ten days and one week, which was officially said to be implemented for 12 years, but never really implemented. In 1929, Stalin enforced a five-day week in the Soviet Union, and later formulated a six day week system, but it also failed.