Wei Zi dou Shu

As mentioned above, the calendar for calculating the year, month and day in China is a "summer calendar" with a mixture of lunar calendar and solar calendar. There is a fixed time difference between the sun and the moon, which is10days 2 1 hour12s every year. Because of this difference, a leap month is added to make up for it. There is a leap every three years, and there are thirteen months in leap year, which is 383 days 2 1 hour 32 minutes 37 seconds. Because the difference is still redundant, we add a leap month every five years and seven leap months every nineteen years. The interpretation of leap month in Zhou Xun is: "Nineteen years is one chapter, four chapters are one, twenty is one, three is one, seven is one, and the maximum is 31,920 years old." The leap month in the summer calendar is based on qi, which is in the dark, and the leap month is in the next month; Qi is in the new moon and leap month is in the previous month. Therefore, leap months have only knots, but no breath. We can also say that in the summer calendar, no neutral month is a leap month. However, the calculation of Wei Zi's bucket number is not based on solar terms. We know that the month of leap month depends on the previous month. For example, leap March is preceded by March, followed by leap March; After May, there will be a leap month, so when it comes to leap months, in fact, January has passed, so people born in leap months will be counted as next month. For example, the life span of leap March is calculated according to April, because March ends before leap month; People born in leap August are counted as September, and so on. But when calculating the fleeting time, every leap month, we will not calculate the next month according to the method of pushing the map. There is a saying in the book that "leap month refers to the time between two days", so it is calculated that leap month will be divided into two parts: the first half of the month, from the first day to the fifteenth day of the sea, according to the last month to find out good or bad luck; From 16 to the end of the month, check the fortune according to the next month. For example, the fleeting time is in May, that is, from the first day of leap May to the last day of leap May, and good or bad luck is calculated according to May; From leap May 16th to the end of the month, the fortune is calculated in June, and so on. (Note) There have been two opinions on the deductive algorithm of leap year: one is the proposition introduced by Mr. Lu here, that is, leap month is counted as next month, such as leap March and leap April. The other is to divide the leap month into two halves, the first half belongs to the previous month and the second half belongs to the next month. For example, leap in March, the first to fifteenth day of March, and the sixteenth to twenty-ninth day of April (or thirty). -Wang Tingzhi's Biography of Teachers adopts the latter method, which is different from Lu. However, one of Wang Ting's opinions is that every leap month birthday, you might as well add a life table as a reference and do a little inspection to find out which life table is real, so as to determine which life table is correct. As for the theory of fortune telling, it has nothing to do with "solar terms". People born in the first month will do it in the first month, whether it's after the Spring Festival or after the rain. This is not a simple theory. Gaiming's book "The Book of Doors" has the language of "not like the Five-Star Festival, but about the birth of the year, month and day". In recent years, there have been many different opinions, some of which advocate "starting the palace of life on holidays", just like the method of fixing the birth month in Ziping, which looks too strange and innovative.