Why does the lunar calendar leap for one month every four years?

First of all, there is a folk saying that there are two leaps in three years. According to the calendar statistics, there are three leaps in seven years. In the eleventh year of Xianfeng in Qing Dynasty (186 1), the year of the rooster was a year without beginning of spring solar terms, but in the year before it (1860), there were two beginning of spring in March 384: the year before the year of the rooster in 2005, and the year before the year of the rooster in 384. Leap July in 2006 is a rare leap year, with eight big months, five small months and 385 days. Naturally, there are two beginning of spring (if the first beginning of spring is two days earlier, there will be not only two beginning of spring, but also two rains), so the Year of the Rooster in Yiyou in 2005 is another "Golden Rooster in April" after 18 1 year ago. Any calendar is based on astronomical phenomena, but the same astronomical phenomena can have different calendars. For example, the objective astronomical phenomenon in beginning of spring is the moment when the sun moves to 3 15 degrees from the earth, which is the case every year. However, due to different calendars, the same timetable in astronomy is different in various calendars. China lunar calendar is a combination of yin and yang, giving consideration to the sun and the moon, and setting four hours by setting leap months. Leap year is thirteen months (383-385 days), which can accommodate 25-26 solar terms, and there must be two beginning of spring. (1984 and 2033 are both lunar leap years, with two spring rains and 26 solar terms. ) There will naturally be no beginning of spring next year. Someone asked, didn't the leap year of the lunar calendar mean a leap every three years and a leap every five years? Why are there two leap years in Golden Rooster and Four Springs in three years? The complete statement should be "one leap in three years, two jumps in five years and seven jumps in nineteen years". Because the lunar calendar has twelve months in a normal year, thirteen months in a leap year, seven leap years in nineteen years, and * * * has 235 moons and 69938+08 days. It is basically the same as 6939.82 days in the tropical year of 19. There are seven leap years in nineteen years. Naturally, they can't all be leap years separated by two years. Leap years separated by one year should be added after two or three leap years separated by two years. Generally speaking, there are four beginning of spring once every ten years and twice every three years. Of course, April is not necessarily a golden rooster, but a golden monkey or a jade rabbit. As for which year to add leap month, different calendars are different. The lunar calendar is a leap month with a neutral month. In China, the Dai calendar and the Tibetan calendar are also combined with yin and yang, but the Tibetan calendar has a leap month every 32 months, the Dai calendar has a leap in September, and the first month of the Dai calendar is June (equivalent to March of the lunar calendar). So they are different from beginning of spring in the lunar calendar. There is also the 186 1 year of the "four spring golden rooster" mentioned earlier, which was during the Taiping Heavenly Kingdom, and the Taiping Heavenly Kingdom used the calendar. The calendar takes that day in beginning of spring as the first day of the first month. Therefore, in the beginning of spring of 186 1, the Gregorian calendar is February 4th, the lunar calendar is February 25th of the Year of the Monkey, and the lunar calendar is the first day of the first month of the Year of the Rooster (the 11th year of the Taiping Heavenly Kingdom).

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