What is the basis of fortune-telling marriage?

If you go to fortune telling, you usually calculate the wedding date according to your eight fingers. These fortune-telling methods are only understood by people who count eight characters. In fact, fortune-telling is superstitious and not allowed at all. City people don't believe it at all, and you won't go to a fortune teller to calculate the wedding date. The wedding date is always up to you. For example, find something festive.