What was written in the He Tu and Luo Shu? Why was it called the Ancient Heavenly Book?

He Tu and Luo Shu referred to the two important cultural materials in ancient China, namely the Book of Changes, He Tu, and Luo Shu. They were all important components of ancient Chinese culture and were known as the ancient heavenly books. The Book of Changes was a book on divination and philosophy. It mainly talked about how to predict the future and explore the nature of everything in the universe through divination. The River Map, on the other hand, was a geographical map of the Earth's geography and weather. It also contained some knowledge of divination and astronomy. The Book of Luo was an astronomical map that recorded the movements of the sun and planets. It was also one of the important materials in ancient Chinese culture. The He Tu and Luo Shu were known as the Ancient Tomes of Arcane mainly because of their important position in ancient Chinese culture. They were regarded as cultural classics that surpassed ordinary books. Their spread in Chinese culture could also be traced back to ancient times. They were regarded as important information that transmitted the secret information and energy between heaven, earth, and man. This was also one of the reasons why they were still receiving attention and research.