Zhang Xiantong.
The "Book of Changes" is a product of ancient civilization. It is a highly philosophical work that integrates my country's natural sciences and social sciences. The "Book of Changes" is divided into three parts, "Lianshan" and "Guizang" in the Emperor's era, and "Zhouyi", the Book of Changes in the Qin and Han Dynasties, are collectively called the "Three Books of Changes" (there is another theory that all three books were written in ancient times) . In ancient times, people determined celestial phenomena, observed earthly rituals, observed phenomena and told time, created calendars and Yi Shu, etc. This was the beginning of civilization.
"The Book of Changes" is an ancient Chinese philosophy book. It is a book based on the dualism of yin and yang to demonstrate and describe the laws of the operation of things. It classifies the properties of all things in the world, and the theory of heavenly stems and earthly branches and the five elements. It is even accurate enough to make relatively accurate predictions about the future development of things. Some people directly refer to "Zhouyi" as "Yijing". There are eight main hexagrams in the Book of Changes: Qian, Kun, Zhen, Gen, Li, Kan, Dui and Xun.
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