Why is a week seven days?

Now all countries in the world use the system of seven days a week. This system was first formulated by Constantine the Great. On March 7th, 32 1 year, he officially declared seven days as a week, and this system has been in use ever since. The English names of seven days a week are Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday.

These names originated in Babylon, Cuba. In the 7th and 6th centuries BC, the Babylonians had a weekly system. They divide a month into four weeks, and each week has seven days, which is a week. Babylonians built seven-star altars to worship the stars. The seven-star altar is divided into seven layers, and each layer has a star god. There are seven gods from top to bottom: sun, moon, fire, water, wood, gold and earth. God is in charge of one day of the week, so he sacrifices to a god every day, and every day is named after a god: Chamakh, the sun god, is in charge of Sunday, which is called sunny day; The moon god Xin is in charge of Monday, called the moon day; Niga, the god of Mars, is in charge of Tuesday, which is called the bright day of fire; Naboo, the god of mercury, is in charge of Wednesday, which is called Water Rong Yaori. Duke, the god horse of Jupiter, is in charge of Thursday, called Mu Yaori; Istar, the god of Venus, is in charge of Friday, called Jin Yaori; Saturn's god Ninuda rules Saturday, which is called the Rong Yaori of the Earth.

The weekly system founded by Babylonians first spread to ancient Greece and Rome. The ancient Romans named 1 week and 7 days after the gods they believed in: Sun Day, Moon Day, Mars Day, Mercury Day and Jupiter Day. After the name spread to Britain, the Anglo-Saxons changed four of them with their own names of gods, replacing Mars Day, Mercury Day, Jupiter Day and Venus Day with Wednesday, Thursday and Friday respectively. Tuesday came from Tiu, the Anglo-Saxon god of war. Wednesday comes from Walden, the highest god, also known as the Lord God. Thursday is from Raytheon. It's Raytheon. Friday comes from frigga and is the goddess of love. This forms the names of 1 7 days in English today: Sunday (Sun God Day), Monday (Moon God Day), Thursday (God God Day), Thursday (Raytheon Day), Friday (Love God Day) and Saturday (Land God Day).