What did the defense say to the zodiac and the underworld?

Xie Fang is an alchemy book often mentioned in ancient Chinese literature, which mainly records some methods of alchemy and divination. Part involves the concepts of the ecliptic and the underworld.

The ecliptic refers to the time required for the sun to orbit the ecliptic once, that is, the length of a tropical year. In the ancient calendar of China, the length of the ecliptic was defined as 365.2425 days. Mafia, on the other hand, is relative to the ecliptic, which refers to the time required for the moon to make a circle in the Mafia zone, that is, the length of a new moon. In the ancient calendar of China, the length of the underworld was defined as 29.53059 days.

In Jie Ji, the ecliptic and the underworld are used to describe the trajectory of the sun and the moon. The ecliptic is described as a circular trajectory around the sun, and the underworld is described as a circular trajectory around the moon. In addition, Jie Ji also mentioned some divination methods about the ecliptic and the underworld, such as choosing the appropriate action opportunity according to the auspicious days of the ecliptic or avoiding unlucky activities according to the ominous days of the underworld.

It should be noted that the concepts of ecliptic and underworld and divination methods recorded by Xie Ji are not scientific and reliable, but only a manifestation of witchcraft superstition. In modern society, we should follow scientific methods to understand and explain natural phenomena and avoid blindly believing in superstition and magic.