I am learning it recently, thats Encyclopedia for me ~! we can learn all knowledge including astrology ,human body, etc. it tells me what i can eat in the beginning of spring in roder to take care my internal organs, the first time i heard of this book is from my grandfather, he's a professor of chinese traditional medical industry. its wrote by ancient chinese language which is very complicated and hard to understand. now I'm reading a morden version of it with some graphics to helps me easy understand what it saying, about the predicting things I'm still investigating, cuz there are many methods to calculate numbers which relate to the results. one of those interesting ways is using turtle shell to do the predict, and also have a method use the date, time calculate the whats going to happened. the sign of environments (birds fly from north or south ) also be able to used by wizard or predictor to seeing the future.and there is no one know when and where and who wrote it….more like book from heaven….
