What does the underworld mean in the old calendar?

The ecliptic and the underworld are the trajectories of the sun between stars described by human beings with the earth as the observation point. Obviously, it doesn't conform to astronomical science.

There are two main methods to calculate the ecliptic and the underworld. One is that twelve places support twelve gods. The other is twelve values.

The twelve earthly branches and twelve gods are as follows:

Ziri Qinglong

Enemy against Tang Ming

Yin Ritian's punishment

Maori suzaku

Chen jinrigui

Four-day virtue

White tiger in the afternoon

Wei Yu ri Tang

Shenri prison

Youri Xuanwu

Take control of the day

Ri hai Gou Chen

Those who encounter Qinglong, Tang Ming, Jingui, Tiande, Yutang, Siming and Liushen are called Zodiac Day. People often say that the zodiac is auspicious. When you meet this auspicious day, you can break ground, build, get married, start a business and other activities. On the contrary, Mafia Day is a bad day, so it is not suitable for holding major events.