What does this mean?

The sun, the moon and the fire are collectively called "obsidian", and the seven-star stone of the sun, the moon, the fire, the water, the wood, the gold and the earth are collectively called "seven obsidian". In ancient China, South Korea, Japan, and North Korea, it was customary to say that there were seven days in a week, such as "Japanese Obsidian Day" was Sunday, "Moon Obsidian Day" was Monday, and so on. Today, it is no longer officially used in China, but it is still used in China folk calendars and Japanese and Korean calendars.

The correspondence is as follows:

1, Yueyaori (げつよぅび, Ge Zuyou 弼) = Monday;

2. Fire Obsidian Day (かよぅび, Caiuby) = Tuesday;

3. Water Obsidian Day (すぃよぅび) = Wednesday;

4. Obsidian Day (もくよぅび, Mokuyubi) = Thursday;

5. Jin Yaori (きんよぅび, Jin Youbi) = Friday;

6. You bi)= Saturday;

7. Nichi Youbi (にちよぅび) = Sunday;

Extended data:

Japan usually adopts the method of calculating the week from Japan to Japan, but in order to improve the calendar, China changed "Monday", "Tuesday" and "Saturday" to "Sunday" because the western "Sunday" and "Japanese day" are not smooth.

Babylon had a similar use. 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.

References:

Baidu Encyclopedia-Ri Yao Ri

References:

Baidu Encyclopedia-Yaori