How to divide spring, summer, autumn and winter?

Talk about Jerry Lee's earthly branch again. The earthly branches of the upper, middle and upper three yuan in each solar term are also regular. Before describing this law, we have to talk about the problems of Mencius, Zhong and Ji in Twelve Branches. We know that there are twelve earthly branches, and the months of a year are exactly twelve, so one earthly branch dominates a month, which is called monthly construction. Build Yin in the first month, and build Mao, Chen, Si, Wu, Wei, Shen, You, Xin, Hai, Zi and Ugly from February to December. If these twelve seasons are divided into spring, summer, autumn and winter, three months is a season. This is Yin, Mao, Chen Shichun, and so on. These three months of each season are called "Meng" in the first month, "Zhong" in the second month and "Season" every three months. Therefore, Yin, Shen, Si and Hai are four Meng, Zi, Noon and Mao, Unitary is four Zhong, and Chen, Xu and Ugliness are four seasons. Now let's talk about the first support method of three yuan per yuan in each solar term. No matter which solar term, the earthly branch of the first day of Shangyuan is one of the four secondary branches, and there is no child, noon, hair and unitary; On the first day of the Central Plains, the earthly branch is one of the Four Mencius, and there is no yin, Shen, Si and Hai. The first branch of the next Yuan Dynasty is one of the four seasons, and there is no distinction between beauty and ugliness. Looking at the two points mentioned above together, the law of the first day of each solar term is: the first day of each solar term is either Jiazi or Wu Jia, or Jimao or Ji You; On the first day of the Central Plains, the main branch was either Shen Jia, Jiayin or the Second Sea; On the first day of the next Yuan Dynasty, Ganzhi was either JOE or Chen Jia, ugly or not. So judging which game this day belongs to depends on which solar term this day belongs to. On a large scale, the twelve solar terms from the winter solstice to the awn seed are all yang dun, and from the summer solstice to about the twelve solar terms are all yin dun from a small scale. After determining whether these three are yin dun or yang dun, it depends on which solar term this day belongs to, and you will know which bureau this day belongs to.

The shangyuan of a solar term does not start from the day when the solar term is paid. The first day of a solar term, sometimes before this solar term, sometimes after this solar term, is only the same day as the solar term in some cases. The first day of the solar term is called "Fu Tou". On the first day of the solar term, I ran in front of the solar term, that is, Fu Tou arrived first, but the solar term didn't arrive. This is called "super god". The first day of the solar term falls after the solar term, that is, the solar term is before Fu Tou, which is called "collecting gas". If the beginning of this solar term coincides with the solar term, that is, Fu Tou coincides with the solar term, this is called "giving". At first, Fu Tou only exceeded the solar terms by one or two days, and then more and more. After nine days, we will make a leap, that is, repeat a solar term, that is, repeat the upper, middle and lower three yuan of a solar term. For example, put a leap on the festival of Miscanthus, and the upper, middle and lower elements of Miscanthus are the sixth, third and ninth innings of Yang Dun, that is, after the ninth inning of Yuanyang Dun under Miscanthus, then the last day (the fifth day of Miscanthus), arranged in the order of day and morning, then the sixth, third and ninth innings of Yang Dun, and then the ninth inning of Yuanyang Dun from summer to morning. The triple leap is called "leap odd"

It should be noted that it is not carried out in any solar term. These two festivals are mango and heavy snow. If it weren't for these two solar terms, even ten days would not be a leap. Why put it in these two solar terms? This is because these two solar terms are just before the second day of junior high school. Yang dun starts from the winter solstice, Yin dun starts from the summer solstice, and it is a leap before the second and second solar terms, that is, before Yang dun and Yin dun start, Fu Tou is adjusted to make Fu Tou as close as possible to the solar terms without exceeding too much.