This article introduces the accurate knowledge of the ecliptic sky divisions made by ancient Huaxia civilization, such as the 12 Ci / 12 Signs of the Zodiac , the 28 Mansions, and the 64 Hexagrams, as well as the basic knowledge of astronomical observation and calendar setting in pre-Qin times. As a result, the astronomical and calendar characteristics recorded in ancient Chinese historical documents can be used to identify the exact times of the major events in Huaxia history and world history. This article also discusses why “Yi Jing” is divided into the upper and lower sections, how the sequence of the 64 Hexagrams is arranged, and the relationship between the arrangement of the 64 Hexagram and the major historical events. It can be ar...