2. Chronology of trunk and branch: Chronology of trunk and branch is one of the most basic chronologies in ancient China. The earliest records can be found in the astronomical training of Huainanzi, but this method was not popular in the Western Han Dynasty. Since the 30th year of Jianwu (AD 54) of Guangwudi in the Eastern Han Dynasty, official support has been officially used in chronology. Chronology of branches and branches is widely used in ancient Chinese medicine books.
3. Chronology: In ancient China, it was originally based on the year when the king ascended the throne, such as the first year of Zhou Xuanwang (827 BC).
4. Chronology of the Republic of China: 19 12 years after the founding of the Chinese nation, 19 12 years was determined as the year of the Republic of China. Since then, there has been the Republic of China Law.
5. Chronology of the Zodiac: The story of the Zodiac can be traced back to the Eastern Han Dynasty and has never been recorded before the Han Dynasty. Zodiac can be used to calculate a person's age and year of birth, and the zodiac chronology has also been used in history. For example, in the Yuan Dynasty, it was recorded that "the year of the emperor was too definite, and the year of the rat was the year of Jiazi, that is, A.D. 1324".
6. chronology of star age: during the warring States period, astronomical astrologers had a so-called chronology of star age according to astronomical phenomena. The star refers to the year-old star (that is, "Jupiter"), and the year-old refers to Tai Sui (a false year-old star invented by ancient astronomical astrologers, also known as the year-old yin and the lunar yin). So there are chronology and chronology.