How to calculate which year has a leap month, how to calculate which leap month

Divisible by 4 but not divisible by 100 is a leap year, or divisible by 400 as a leap year.

Take this year, for example, [2009] and divide it by 4, dividing it is a leap month, and dividing it is an ordinary year.

In the old Chinese lunar calendar, a year with a leap month was called a leap year. A normal year is 12 months, 354 or 355 days, and a leap year is 13 months, 383 or 384 days. As a lunisolar calendar, the number of days in the lunar calendar is determined according to the monthly wancing, and the time of the year is based on 12 months; In order to coincide with the Earth's orbital cycle around the sun, i.e., the return year, one month is added every 2 to 4 years, and the additional month is a leap month, so the leap year of the lunar calendar is 13 months.

The calculation of leap months in leap years, one leap in 3 years, two leaps in 5 years, and seven leaps in 19 years; The lunar calendar is basically a cycle of 19 years, corresponding to the same time in the Gregorian calendar. For example, May 27, 2001, May 27, 1982 and May 27, 1963 in the Gregorian calendar are all the fifth days of the fourth month of the leap month.

Leap years between 1950 and 2050:

The analysis process is as follows:

The year 1952 is a general year, 1952 4=488, 1952 is divisible by 4, so 1952 is a leap year.

The year 1956 is a general year, 1956 4=489, 1956 is divisible by 4, so 1956 is a leap year.

1960 is a general year, 1960 4=490, 1960 is divisible by 4, so 1960 is a leap year.

1964 is a general year, 1964 4=491, 1964 is divisible by 4, so 1964 is a leap year.

1968 is a general year, 1968 4=492, 1968 is divisible by 4, so 1968 is a leap year.

Leap month, the lunar calendar uses the moon around the earth to determine the calendar, and the difference between 5:48:46 and 36 on the 365th day of the return year is about 10 days and 21 o'clock, and the leap month is accumulated, so there should be a leap month every three years, two months every five years, and seven leap months every nineteen years. In this way, the month added to each leap year is called a leap month. A leap month is added after a certain month, and it is called a leap month.

A month added to each leap year. The lunisolar calendar takes the length (day) of the synodic month as the average value of the month, and the difference between December and the return year (day) is about 10 days and 21 o'clock, so the leap is placed in order, one month for the three-year leap, two months for the five-year leap, and seven months for the nineteenth year.

What is the contradiction between the return year and the lunar year? Remember: the total length of the return year is days, and the length of the synodic month is days.

The twelve synodic months make up the lunar year, which is a day in length and is nearly 11 days less than the return year, and nearly 1 day less in each month.

In this way, the month added to each leap year is called a leap month. A leap month is added after a certain month, and it is called a leap month.

A leap month is a way of placing an intercalary in the calendar. In Asia (especially in China), the leap month refers to the month that is added every leap year in the Han calendar (also known as the lunar calendar) (in order to reconcile the contradiction between the return year and the Han calendar year, and to prevent the Han calendar year from being out of touch with the return year and the four seasons, one leap is placed every 2 to 3 years).

The lunar calendar is based on the length (day) of the synodic month as the average of one month, 12 months in the year, and the return year (day) is about 10 days and 21 o'clock, so it is necessary to place a leap, three years leap one month, five years leap two months, nineteen years leap seven months.

In ancient times, a leap week with 7 leaps in 19 years was used, and the fixed leap week was abolished in the "Lin De Calendar" of the Tang Dynasty, and the intercalary week was placed in the month without middle air, so it was the intercalary time intercalary time). Sometimes, a leap month also refers to a month in a leap year of the Gregorian calendar that includes a leap day (i.e., February of a leap year in the Gregorian calendar).

There are only 12 months in a year, but the "leap month" theory says that there are 13 months in a year. In daily life, I often hear people say "leap month", so what exactly is a leap month? Is there a leap month in which year can it be calculated?

What is a leap monthGenerally speaking, according to the solar calendar, a year is 12 months, with a total of 354 or 355 days. The term leap month is the lunar calendar, which means that there will be an extra month in the lunar year, and such a month is called a "leap month", and this year is also called a "leap year".

The ancients also called the 235 synodic months "leap weeks". In other words, a year with a "leap month" would have 13 months in the year, with the shortest leap year having 383 days and the longest, rarer leap year, having 385 days.

A leap month is actually a way of placing a rubber hole in the calendar. A leap month is a month that increases every two to three years in the lunar calendar. The earth revolves around the sun, and if this calendar is used all the time, there is no way to meet the needs of agricultural production.

Because, there is a lunisolar calendar and the 24 solar terms parallel calendar, but such a calendar is easy to contradict, there will be a strange phenomenon that the time of day and the calendar are inconsistent, and the time sequence is reversed. Thus, there was the practice of "leap month".

How to calculate a leap monthA leap month is not called a thirteenth month, but rather a "leap month" after the month that appears. In general, a leap month is the same month in which emissions are repeated from February to October.

According to Xiaochen's formula m for finding the least common multiple of the number of days in the return year and the number of days in the synodic month, it can be seen that 7 leap months must be added to the 19 return years. Therefore, the lunar calendar adopted the method of adding 19 years and 7 leap months, that is, the "seventeen years and seven leap methods".

And the upcoming year 2020 is a leap year, and this year is leap April. Folk sewing leap year leap month, there are more special customs, such as leap month shoes, leap month rice, etc.