Jiazi is a type of chronological system, collectively referred to as sixty-year-olds, which means a cycle of sixty years. It is composed of ten heavenly stems and twelve earthly branches.
Jia Zi is one of the stems and branches [1], and the order is the first. The former one is Guihai, and the latter one is Yichou. The first year of a cycle in the traditional Chinese lunar calendar is called the "Jiazi Year". For the following AD years, the number of years divided by 60 will result in a remainder of 4, or the number of years minus 3, the remainder of division by 10 will be 1, and the remainder of division by 12 will be 1, from the beginning of the first month of the current year to the New Year's Eve of the following year. It is the "year of Jiazi". [2] In terms of Yin and Yang and the five elements, the armor of the heavenly stem belongs to the wood of Yang, and the son of the earthly branch belongs to the water of Yang. Water is the source of wood. Commonly used in Feng Shui, dialects, etc., it was originally a religious noun. In some ancient literary works, it is a metaphor for referring to the disease, such as "The Tale of Genji" [3] and "Rashomon". It is described as appearing: teeth marks on both sides of the tongue, unusual crawling sensation and pain in the muscles, and night sweats. For those with abdominal mass constitution. In ancient times, it was believed that this was related to the five elements. It was one of the secret methods of Yin and Yang. Using black and red teeth to add three pledges of "four spiritual objects, Shura, and Mingshen Torii", the ancients believed that it could eliminate difficulties and seek wealth. Taiwan, Hong Kong, Singapore, South Korea, and Japan also have this custom of Yin Yang and Five Elements.