Why: There will be no leap twelfth lunar month (65438+February) in 10 year?

The lunar calendar has been used for a long time in China, also known as the summer calendar. It was once dismissed as an "abandoned calendar". The last revision was in the seventh year of Qing Qianlong (about

(1742), which was determined by the revision of Tang Ruowang's "Constitutional Calendar" by Zai Jinxian. Farmers in China are very familiar with the lunar calendar.

As we all know, many folk festivals are based on the lunar calendar. There are also twenty-four solar terms, new moon, hope and twelfth birthday which are widely popular with the lunar calendar.

Xiao et al. have less lunar calendar 1 1 day each year than solar calendar, and 33 days less in three years. Therefore, every three years plus one month is called leap month. But three years

There are still three or four days to jump, which is still inaccurate. So the method of two jumps in five years was adopted. But in five years, the two leaps increased by four or five days. So it took eight years.

Three leap to remedy, but three leap in eight years and two days less. After repeated astronomical observations and practical tests, we finally set a seven-year leap of 19.

There are 7 leap months between 65438 and 09. Gregorian calendar 19 is 6939. 18 days, and lunar calendar 19 (including 7 leap months) is 6939.438+0.

Day, so the difference between the two calendars is only about 2 hours, so it can be said that it is more accurate. It should also be pointed out that in ancient China

Zu Chongzhi, a contemporary scientist, creatively put forward the leap method of setting 39 1 year as 144 leap months, which is more accurate.

Therefore, the lunar year is sometimes twelve months and sometimes thirteen months, which is not chaotic, but strict.

Scientific laws. However, which month of the year is a leap month? The position of the lunar leap month is different in history.

Working on it. Generally speaking, before the early years of the Western Han Dynasty, the leap month was placed at the end of the year. For example, in the early Han Dynasty, September was regarded as a year.

The last month of September, when the leap month was placed after September, was called "post-September". Later, with the gradual development of the calendar,

Accuracy, but also stipulates the placement method of leap month, that is, the month without neutral gas as leap month. This bouncing instrument

It is still in use today. Therefore, the following is a special introduction to China Automobile.

Medium coke (medium coke energy)

Zhongqi is a part of the 24 solar terms. The 24 solar terms are actually a reflection of the movement of the sun's surface, but the fact is that

In essence, the ecliptic is divided into 24 equal parts, and the unequal parts should account for 15 degrees of the ecliptic. Therefore, each month contains two solar terms. This is in ancient times.

The generation is collectively referred to as "Qi". Later, people called the front "solar terms" and the back "neutral gas". Due to two solar terms or

The average number of days between the two neutral gases is 365.2422/ 12=30.4368, while the first month of the lunar calendar is 29.5306, which is almost the same.

A day's difference. Therefore, the neutral date of the lunar month will be delayed by nearly one day every month. If this situation continues, it will

However, the gas in some months is on the last day of this month, so there will be no gas next month, but it will happen in

Early next month. Because every month has its own fixed neutral atmosphere, then the month without neutral atmosphere is called leap month.

This is natural. Of course, after complicated calculation, the arrangement of leap month can be determined in detail. The following table lists the slave 1949.

Distribution of lunar leap months in 2020.

A.D. 1949-2020 Lunar Leap Month Table

1949 leap July 1952 leap may 1955 leap March 1957 leap August 1960 leap June.

1963 leap April 1966 leap March 1968 leap July 197 1 leap may 1974 leap April.

1976 leap August 1979 leap June 1982 leap April 1984 leap October 1987 leap June.

1990 leap may 1993 leap March 1995 leap August 1998 leap may 200 1 leap April.

Leap February 2004 Leap July 2006 Leap May 20 12 Leap April 20 14 Leap September.

2017 leap in June and April in 2020

As can be seen from the above table, there are many leap months in April, May and June, but few leap months in September and October, especially in November and December.

January and the first month. Why is this? It turns out that the time interval between these two gases is not the same. As mentioned earlier.

30.4368 days is just an average. In fact, the earth's orbit around the sun is an ellipse, and the sun is located on one of the ellipses.

Focus. The farthest point on the orbit from the sun is called apohelion, and the nearest point is called perihelion. The earth is far away.

If the motion near the sun point is slow, the time interval between two neutral gases will be very long, up to 3 1.45 days, so there is no possibility of neutral gases.

The more you have, the more chances you have to leap into the moon. On the contrary, the earth moves very fast near the perihelion, and the time interval between the two gases is very short.

The shortest time is only more than 29 days, so there are fewer opportunities to be out of breath and leap months. So, we are interested in the first month.

Or the twelfth lunar month (including November), it is not surprising that there is no leap month. If the leap month is in the first or twelfth month, then

Can't we have two Spring Festival or two New Year's Eve? In fact, this calendar existed before the Qing Dynasty, but later due to

When the method of annotating calendars changes, there is no such coincidence anymore. There will be no leap months in the first and twelfth months.

You won't ask again after reading this. The lunar calendar in China is such a delicate project. You asked so rashly that the answer came out.

Wait, or there may never be a leap October in your life again.