In geomantic omen, the diseased star refers to 2 black Saturn. Its location should be calculated according to the construction time and orientation of the house. Not specific in which direction, not fixed. The time and direction of building are different. Black Saturn may be in the north, in the south, in the east and so on. Not fixed.
The position of two black disease symbols is easy to cause diseases, especially when two black disease symbols and five yellow evil spirits are together. Black disease symbol and yellow evil are Saturn, which can be dissuaded by gold to reduce its ferocity, which is called "evil".
I can tell you a simple way to find it: look at the house carefully, and the house will be damaged at the position of two black disease symbols. You find out the damaged location of the house (not man-made damage), and put a copper gourd in this location to melt it.