The moon and the sun 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 a seven-star altar to worship, and the moon god Xin was in charge of Monday, which was called Moon Day.
Every day in the same week has a different name: Earth Kiln Day is Saturday, Mud Kiln Day is Sunday, Moon Kiln Day is Monday, Fire Kiln Day is Tuesday, Water Kiln Day is Wednesday, Obsidian Day is Thursday and Golden Kiln Day is Friday. Moon God Xin is in charge of Monday, which is called Moon Yao Day.
Obsidian Day refers to the memorial method of Seven Obsidian Days:
This is an ancient weekly symbol. These names originated from the Zhou Dynasty (about 1 1 century -256), from the natural worship of the stars by ancient people in China, and the 28 star zones divided by ancient astronomers in China to observe the movements of the sun, the moon and the five stars were used to explain the positions of the sun, the moon and the five stars.
In ancient China, it was widely used in astronomy, religion, literature, astrology, geomantic omen, lucky choice and so on. Different fields give it different connotations, and the related content is very complicated.
At present, its original origin is still inconclusive. If we look at the cultural relics, the lacquer box unearthed in Sui County records the complete names of 28 families for the first time. It is recognized by historians that Twenty-eight Nights was first used in astronomy, so its position in the history of astronomy is quite important.