202 1 What's the date of the annual Three Evil Days?

The exact time can't be calculated, roughly in the north.

For example, if Renshan is also a son and his son is in the north, he can't break ground in the third party (snake) or horse (sheep), and he can't choose April (snake), May (noon), June (sheep) and the month of Yin (tiger) or horse (dog) for daily lessons.

Geomantic terminology:

How to use these three evil spirits? In terms of years, there are three northern evil spirits in Yin Wu every year. During the Shen Dynasty, there were three evil spirits in the south. Before the year of Haimao, the west was the three evils in the middle of the year. In the ugly year, the East is the third evil spirit. If the terrain you choose belongs to the direction of evil, you can't build a tomb.

It is forbidden to build in the north every year, but it is forbidden to build in the south, and Haimao is forbidden to build in the west. It is already ugly to build in the east.