What does "the ecliptic and the underworld" mean in ancient astronomy?

The ecliptic refers to the orbit of the sun in the stars for one year, while the underworld refers to the orbit of the moon in the stars for one week. The ecliptic and the underworld were originally used by ancient astronomers to observe the trajectory of the sun and the moon centered on the ball, and were later attached by astrologers with various theories such as good luck and bad luck.

Astrologers match the twelve branches of the sun with twelve different gods on duty. In the twelve days, the twelve gods rotate once each, and go back and forth.

Zi Ri Qinglong, Chen Kui, Shen Ri Tian Prison, Ugly Day, Si Ri Tian De, You Ri Xuanwu, Yin Ri Tian Punishment, Wu Bai Hu, Xu Ri Siming, Mao Ri Suzaku, Wei Ri Yutang, Gou Chen.

The auspicious days of the ecliptic include the days when Qinglong, Tang Ming, Jingui, Tiande, Yutang and Siming Six Gods are valued.

Mafia auspicious days include days when we attach importance to the Six Gods of Heaven, Suzaku, White Tiger, Heavenly Prison, Xuanwu and Gouchen.

Song Yue:

The ecliptic is best for all kinds of actions:

The door is right, and the children and grandchildren hang purple clothes from generation to generation.

The creation and restoration of underworld evil stars, famine and chaos will be alarmed;

In and out of the trip, there was a fierce disaster, and once the farmland was closed.

It is worth mentioning that the ecliptic day may not be the best, and the underworld day may not be the worst. It depends on the birth years and blessings of other good and bad gods.