How did seven days a week come about?

Genesis in the Bible records the process of God creating the universe. On the first day, God created light, on the second day, he created air and water, on the third day, he created land, sea and all kinds of plants, on the fourth day, he created day and night, festivals, days and years, on the fifth day, he created all kinds of animals, on the sixth day, he created man in his own image, and on the seventh day, when he finished his work, he rested.

This has become the origin of seven days a week and Sunday rest.

From 6000 BC to 4000 BC, on the Mesopotamian plain, there lived a nation-Sumerians. By observing the moon's profit and loss, they found that it takes seven days from the semi-circular moon to the full moon. From the full moon to the half moon, the time is 7 days, and from the half moon to the moon, the time is 7 days; The moon disappears to the semi-circle and it is seven days. It can be seen that 7 days is the cycle of the moon's profit and loss. Therefore, they divided a month into four weeks, taking seven days as a cycle, and named these seven days with seven stars: 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 most famous "week".

After the ancient Jews accepted the weekly system, Christians spread it to Europe. Monday and Tuesday are also called "Monday" and "Tuesday" in spoken language, Sunday is called "Sunday" and a week is also called "worship".

In different regions, the start time of a week is different. Japanese people start on Sunday, Egyptians start on Saturday, and China and most European countries start a new week on Monday, which is also the first day of the week according to international standards.