As for how to choose the time, it is very complicated and difficult to explain one by one, because people have to learn for a long time even if they teach. For example, it is the Eighth National Games, and the Eight National Games takes (Eight Diagrams) as the right god, so the ugly roots in (Twenty-four Mountains) are desirable, so look for ugly days or cloudy days in the ugly moon or silver moon, see what the noble people are on that day, and then choose the time of that noble person. Rabbits in the sun or the moon are also similar to the selection method, but the formula for determining the time is different.