Leap year 1 1 month when is there a leap 1 1 month?

Lead: In the process of leap month, theoretically, every leap month is similar, but the actual situation is that it rarely appears before leap November, and the last leap November was 1642 years, that is, hundreds of years ago. So when is leap November? Let's look at leap year 1 1 month.

Leap year 1 1 month

The years of leap November are: 1593, 16 12, 163 1, 1642, 2033,2128,2. Years 3339, 36 16, 37 1 1, 3730, 3825, 4007, 4 159, 4 197, 4322, 434/kloc.

How often does Leap Eleven appear?

Leap November is rare. 18-20th century, no leap 1 1 month. 2 1 century will appear in 2033, and the 22nd century will appear in 2 128 and 2 147.

There were 24 solar terms in the ancient calendar, which were divided into solar terms and neutral atmosphere. The lunar calendar is angry twice a month. The beginning of the month is called solar terms, and after the middle of the month is called qi. "For example, beginning of spring is the first month's solar term, and rain is the first month's gas."

The average length of the two solar terms in Gregorian calendar is 30.5 days, while that in Lunar calendar is only 29.5 days, with a difference of 1 day. So the monthly weather will be 1-2 days later than last month. If this goes on, there will always be a month when there is only solar terms and no gas. This non-neutral month is defined as "leap month" by the calendar and is called "leap month". For example, 1998, the leap month is after May.

In a year, the distance between the earth and the sun is near and far. When the earth is far away from the sun, it moves slowly around June in Gregorian calendar, so the interval between the two gases is longer, exceeding 3 1 day at the longest. According to the average length of the previous 30.5 days, there is a great possibility that there is no gas in the middle of the month and there is a great possibility of a leap month. So leap April, leap May, leap June and leap July have many opportunities.

Around 65438+February in the Gregorian calendar, the earth moves fast, and the interval between neutral gases is short, which is only a little more than 29 days, which is shorter than one month in the lunar calendar, so the probability of neutral gases not appearing in the first month, 1 1 month and1February is small. On the other hand, leap months are unlikely to appear.

The origin of leap November

The traditional calendars in China are arranged in sequence. First, the actual length between two winter solstices is determined, and then the calendar months are arranged. Then, besides the months where the two winter solstices are located, how many whole months (which must be eleven or twelve) exist between the two winter solstices. Although people take the first day of the first month as the beginning of the year, calendars are always based on two consecutive winter solstices. If it is eleven full months, there is no need to set a leap, even if there is a neutral month. If there are twelve full months, you need to make a leap. At this time, you should set a leap according to the "non-neutral gas law", and there is no leap before and after the leap. Because there are only eleven neutral gases except the winter solstice in these twelve months, there is no neutral gas for at least one month. The first neutral month in these twelve months is leap month, and its name is "leap x month". This X is the name of last month. The order of months is determined based on the month of winter solstice. According to the order of earthly branches, the next month is ugly, the next month is cloudy, and so on, and the next month returns to the child. Since the calendars after the Han Dynasty are all based on the lunar calendar, the first month is November, so the winter month must be November. It can be seen that the so-called "winter solstice month must be November" is not a law, but a natural result of calendar arrangement methods, such as "winter solstice month is the next month (early Han Dynasty)", "silver moon is the first month" and "when both winter solstice points (excluding two winter solstice points) are in this month and there are twelve whole months, the first neutral month should be a leap month".

According to this calendar scheduling method, the situation in 2033 is analyzed: there are only eleven full months from the winter solstice in 2032 (Gregorian calendar 2032 65438+February 2 1) to the winter solstice in 2033 (Gregorian calendar 2033 65438+February 2 1), so this period is only eleven full months. Since there are twelve months from the winter solstice in 2033 (Gregorian calendar 65438+February 2 1) to the winter solstice in 2034 (Gregorian calendar 65438+February 22), it is necessary to set up a leap during this period. The "neutral rule" is only adopted when jumping is needed. If there are two or more neutral months, the first neutral month is set as a leap month. If July is a leap year, the winter solstice will set in 10, which is not in line with the age standard of the lunar calendar. Moreover, the first month of the whole twelve months is from the winter of 2033 to the next month (65438+February 22, 2033 -65438+20341October 19), and the previous month is the lunar calendar of 2033. Therefore, when arranging the lunar calendar, there is no need to set a leap in a neutral month.