The symbol that seven days is a week has a long history. It was officially published on March 7, 32 1 year of Constantine the Great, and has been attached to it since the beginning of customization.
The week is determined by the change of the moon phase. It is almost seven days from the new moon to the first quarter moon, the second quarter moon and the second quarter moon. In ancient times, some ethnic groups and Jews in the East used seven obsidians to record the sun, that is, seven days a week correspond to the seven stars of the sun, moon, gold, wood, water, fire and earth, hence the name "Zhou". The first day of the week is Obsidian Day, commonly known as Sunday. Now, "week" has become a common method to record a day in the world.
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In different regions, the start time of a week is not exactly the same. In many English-speaking countries, Judaism and Japan, today is Sunday, and Egypt Week begins on Saturday. Most European countries regard Monday as the first day of the week. Chinese mainland once thought that Monday was the time to start.
But more and more English dictionaries begin to define Monday as the first day of the week, otherwise the word weekend will be difficult to make sense.
From a religious point of view, the Bible believes that God created everything in the world in six days, and rested on the seventh day. The seventh day began on Sunday, and the seventh day was Saturday, so Judaism took Saturday as the Sabbath. After Christianity became the state religion of ancient Rome, because Jesus was resurrected on Sunday, Sunday was changed to Sunday;
Islam believes that God completed his creation on the sixth day, which should be celebrated, so Friday is designated as the main day of worship.