How did Wu Zi explain it?

Wu Zixu is one of the main branches, ranking first.

The 25th year of a cycle in China's traditional calendar is called "Wuzi Year". In the following calendar years, if the number of years is divided by more than 60 and 28, or the number of years is reduced by 3, the remainder after division by 10 is 5, and the remainder after division by 12 is 1. All the years from the first day of the first month of that year to the New Year's Eve of the following year are "the Year of Wuzi". Ming Dong Qichang's "Sacrificing Yuan Huan Gong to the Stars": "(Yuan Keli) Wu Zixu (1588) grew up in the countryside and became a scholar."

Lunar calendar is a dry calendar, and solar terms are used to guide agricultural production. Branches and branches are not divided into solar terms, regardless of traditional habits or official calendars. For details, please refer to the perpetual calendar compiled by Purple Mountain Observatory of Chinese Academy of Sciences.

The year of Wuzi is the year of rat. First of all, it must be clear that the year of Wuzi is the year of the rat. According to China's traditional chronology method-Ganzhi Chronology, Wuzi is one of the heavenly stems and earthly branches combinations, which is the 25th year in a cycle. The first Wuzi is Ding Hai, the year of the pig, and the last is the year of the ox, which conforms to the cycle law of the Chinese zodiac.

In terms of yin and yang and five elements, the heavenly stems of Wuzi Wuzi belong to the sunny land, and the earthly branches belong to the sunny water, but the earth is born with water, and the sound is thunder and fire. So when is the year of Wuzi? How to calculate? We know the Gregorian calendar year, how can we calculate the main branch year, that is, the lunar year.