What days do Japanese Obsidian Day, Moon Obsidian Day, Water Obsidian Day, Fire Obsidian Day, Obsidian Day, Golden Obsidian Day and Earth Obsidian Day represent respectively?

Fire Day (かよぅび, Caiuby) Tuesday

Water Day (すぃよぅび, especially for me) Wednesday.

Obsidian Day (もくよぅび, there is money in the cave) Thursday.

Jin Yaori (きんよぅび, Jin Youbi) Friday.

Earth kiln day (you are better than) Saturday.

Sunday (にちよぅび, Ni Bi)

In spoken Japanese, "Japan (Bi)" is often omitted, and "Yue Yao (げつよぅ, Yue You)" and "Jin Yao (きんよぅ, Jin You)" are directly said.

Ancient China, South Korea, Japan and North Korea all used this calendar to calculate the days with seven obsidians.

Extended data

It had a similar use in Babylon.

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.