Besides China, which countries or regions are popular with constellations? Why is China's astrology so unsystematic?

As a person with a little knowledge, I can only say that this kind of thing is not systematic in China, just like China's Zhouyi. The mode of transmission is very secret for the simple reason. Because it is not taught like a school course, it can only be taught privately in the name of mentoring, and the teaching process may not be systematic. In this way, whoever is destined can learn, not who wants to learn. West Renye Fang may not fully understand Zhouyi, just as China people know very little about Zhouyi. I also know many foreigners, who don't know as much as we do, and some can't even recite the palace 12.

Finally, the person who taught me learned it from another person, who learned it from an "expert" of Sina astrology. Where did the experts learn it? We don't even know.