The relationship between compass and geomantic omen

it's insincere to ask a question anonymously. There are two kinds of wind, water and qi, and qi cannot be separated from a compass. There are many contents measured by the compass, and the simple ones are eight directions, such as Bazhai School; A little more complicated is to see the twenty-four mountains, and the yin house must be seen; No matter how fine it is, it will be 12 cents. Different parties have different requirements for compasses, and the contents used by compasses are also different. For example, the Sanhe faction wants three floors and twenty-four mountains, that is, three sets of heaven, earth and people; Xuankong has only one layer of twenty-four mountains, and the yin and yang attributes of the twenty-four mountains are also different. Without this yin and yang, flying stars cannot be accurate.