What does the ghost on the geomantic compass mean?

X: It's the fourth star of the seven nights in the north. It has two stars, Aquarius and Sagittarius. It is a beautiful binary star, clear and transparent, representing the peace, well-being and happiness of the world. Its dark star means restless and chaotic soldiers. Di: Libra, the third and fourth star of the Seven Nights in the East, is the star of the main illness. Ji: It's the seventh of the seven nights in the East. It has four stars and belongs to Sagittarius. Fight in the north, halberd in the south. Also known as Nanji. Qingming represents good weather and good harvests. Ghost: The second and fourth stars of the Southern Seven Nights belong to Cancer. The colors of the stars are dim, such as clouds and Feiyun, and the stars are not stars, which is ominous.