Why are there seven days a week? What is the origin of seven days a week?

synthesis of the four seas: from 6000 to 4000 BC, there lived a group of Sumerians on the Mesopotamian plain in the Tigris and Euphrates river basins. By observing the full moon and the missing moon, they found that the time from the half full moon to the full moon is 7 days; from the full moon to the half full moon, the time is 7 days; from the half full moon to the half full moon, it is 7 days; from the moon to the half full moon, it is 7 days. It can be seen that seven days is the cycle of the moon. Therefore, they divided a month into four weeks, seven days as a cycle, and named the seven days after the seven gods of sun (Sunday), moon (Monday), Mars (Tuesday), mercury (Wednesday), Jupiter (Thursday), Venus (Friday), and Saturn (Saturday). This is the earliest origin of the name 'week'. They also set up a god tower to worship the Seven Star Gods, believing that the Seven Star gods take turns' on duty 'and each is in charge of one day. After Sumer, the weekly system was inherited by the Babylonians.

Influenced by the civilization of the two rivers, the ancient Jews also accepted the week system. Later, the concept of week spread to Europe with Christianity derived from Jewish religion. 'monday '' Tuesday '& hellip; & hellip; is also called' Monday '' Tuesday '& hellip;, Sunday is called' Sunday ', and a week is also called a' week '.

By the way, the start of the 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 a week has been challenged by the government. During the French Revolution, there was a week system of ten days a week. The official said it would be implemented for 12 years, but it was never really implemented. In 1929, Stalin enforced a five-day-a-week system in the Soviet Union, and later formulated a six-day-a-week system, but it also failed.