What are the eight evil days in the tomb during the date selection?

There are no eight evil spirits in choosing a date, but the eight evil spirits refer to the eight evil spirits of geomantic omen: obsidian and yellow evil spirits. As a poem goes, a monkey is rocked by a rabbit, a snake's head is dried by a chicken, and a tiger is separated from a pig, so the tomb house is closed. Geng Dingkun is in the grave, and Jia Gui is in the middle of nowhere. B and C need to prevent floods first, and Ren Xinshui dare not do it. The offender died in vain, and his parents are ill.

When choosing the date, only the yellow sky is full of vitality and evil spirit. As the poem goes, dry mountains are the most taboo, and Kangong should not encounter eventful days. ...