Xuankong Dagua is a method of fixing sixty-four hexagrams and three hundred and eighty-four lines on the compass according to a certain method. According to this method of use, there are 384 different line positions for Yin and Yang houses, that is, there are 384 different theoretical methods of using things. If combined with the specific environmental terrain, of course it will be ever-changing, and the theoretical system should be large and complete. The problem is:
1. All compasses have differences (my experiment is: randomly select ten compasses, and after several comparisons, the maximum difference is ten degrees, and the difference is usually two or three degrees). In the past, people generally used round disks and could not detect this difference. Nowadays, square disks are invented, which are more convenient and trouble-free to use than round disks. The square plate can be used to test the compass deviation. After testing, it is found that all commonly manufactured compasses have deviations (modern precision azimuth instruments with a precision of 1/100,000 all have deviation characteristics, needless to say for ordinary manufacturing). I don’t know what the ancients used. What compass, and what method was used to fix the three hundred and eighty-four lines to the compass. Are compasses made in ancient times really better than modern ones?
2. Feng Shui is an empirical discipline. If there is no empirical example as a basis, it can only be considered as going from theory to theory, from formula to formula, and cannot be considered as a tested science. This empirical discipline, according to the argument of an authoritative person in China, is that for each method of use, five hundred examples must be found and demonstrated based on real-life examples before it can be considered as a scientific logical inference. Based on this argument, there are 384 theoretical methods used in Xuan Kong Da Gua. The author of Xuan Kong Da Gua must complete about 200,000 social survey cases before they can be considered as scientific arguments. What is actually the case remains to be further considered and demonstrated by later scholars.
The conclusion is: Zhang Wuzhe's Xuankong Dagua method, Jiang Dahong's Xuankong Flying Star method, and the method of dividing gold by the twenty-eight constellations of Lianshan Guizang. These are relatively complicated theoretical systems in the theory of Feng Shui and Qi regulation, and most people dare not get involved in them. Some people have been doing Feng Shui their whole life, and they cannot even name the names of these Feng Shui Qi regulation methods, let alone their specific practical applications. Although the systems and methods of these Feng Shui Qi regulating theories are complex and profound, and the integrity of the system itself is also more complete than other Feng Shui Qi regulating systems, with an empirical scientific attitude, we can only identify this Feng Shui Qi regulating theoretical system. After theoretically completing the formulas and systems, it is necessary to do further scientific verification of practical facts. If someone is willing to make efforts in this area, find examples to demonstrate from reality, and complete empirical considerations, it should be considered a world-first.