What do you mean by "king of earth"?

The use of Tuwang refers to the last 18 degrees of each season.

It's 360 degrees on Sunday, and it's divided equally among the five elements, 72 degrees each. Beginning of spring is 72 degrees wood, long summer is 72 degrees fire, beginning of autumn is 72 degrees gold, beginning of winter is 72 degrees water, and the four seasons are prosperous. The orbit of the earth's revolution is not circular, and the gravity of the moon and other planets leads to the earth's revolution.

Legend:

In ancient times, the Jade Emperor in heaven summoned the five kings of Jin Mu who were in charge of water, fire and earth to heaven to discuss the total war between China and Japan in 365 AD. Jin Mu's four heavenly kings of fire, water and fire arrived here on time. The local king was drunk and lying in bed because of drinking.

The Jade Emperor waited for a long time, but the local king never came. Therefore, the four seasons of the year are divided into spring, summer, autumn and winter, with Wang Mu in charge of spring, Fire King in charge of summer, Jin Wang in charge of autumn and aqua regia in charge of winter. Because the four heavenly kings have different personalities, the four seasons are different.

The jade emperor had just finished the distribution, and the local king had just arrived, clamoring for separate management on the sedan chair boat. But the agreement that has been reached cannot be overturned. So the Jade Emperor came up with a way: in the four seasons managed by each king, 18 days were set aside for the local king to manage, and the four seasons totaled 72 days.

In other seasons, it just lasted for 72 days. At this point, Diwang agreed, saying that he would set aside 18 days for Diwang to manage in March, June, September and1February of the four seasons. No one is allowed to take it.

Since then, the almanac has recorded the "day when the king of the earth used things."