Leap year, leap month? How do you know which year is leap month?

If you don't pay attention, many people may think that "leap month" and "leap year" mean the same thing, but they are not.

"leap year" What we usually call 365 days a year is actually an approximation, and the exact number should be 365.2422 days. Then the difference between 365 days in a year and the actual year is O.2422 days, so four years later it is nearly one day less than the actual year. In order to make up for this difference, the calendar stipulates that four years is a leap year, that is, a year divisible by four is a leap year. Only leap years that are divisible by 400 are leap years. For example, 1996 is a leap year, so is 2000, but 1700 is not. There are 29 days in February, 29 days in February and 366 days in the Gregorian calendar. That is to say, February in a leap year in the solar calendar is not called leap February, but leap month.

Now let's talk about "leap month". Leap moon refers to a phenomenon in the lunar calendar. The lunar calendar arranges the big moon and the small moon according to the full moon of the moon. The length of a moon is 29.5306 days, which is the cycle of the moon's profit and loss. The lunar calendar stipulates that the big month is 30 days and the small month is 29 days, so there are 354 days in a year 12 months. The difference between this year and the solar calendar is 1 1 day. Only after 17 will the date of the lunar calendar be reversed in the same season. For example, a year's New Year is spent in the snow, and after 17, Tik Tok fans will celebrate the New Year. Using this calendar, it is naturally impossible to meet the needs of agricultural production, so our country.

Twenty-four solar terms can be divided into two groups: "solar terms" and "middle qi": the ancients regarded every 300 meridian from slight cold as a solar term; From the winter solstice, every 300 meridian is a neutral gas, and there are 12 solar terms and 12 neutral gas in a year. 12 solar terms divide a year into 12 months, and each month has a solar term and a neutral atmosphere. The solar term is the starting point of the festival. China's traditional calendar does not adopt the long-term arrangement method of day order and month order and big month, small month, normal year and leap year, but emphasizes the calculation year by year and month by month. The state has set up a special organization to calculate the calendar.

(1) The date sequence is determined by the moon phase. It calculates the date and time of the conjunction of the sun and the moon one by one, and the first day of each month is the date of the conjunction; Determine the size of last month according to the number of days included in the second conjunction. If the interval from this phase to the next phase is 30 days, then the current month is a big month; If it is only once every 29 days, it will be an abortion.

(2) Determine the order of months with neutral gas. Firstly, the calendar month and leap month are distinguished by whether there is neutral gas in the calendar month. We know that there are 12 neutral gases in a tropical year, but it contains 365.2422 ÷ 29.5306 = 2.3682 satellites. After a few calendar months, there must be a calendar month without neutrality. It's called leap month. This month without a neutral atmosphere is a leap month. When the current calendar day is several months, it is called leap month. For example, the leap month of 1984 appears after October of the old calendar, so it is called "leap October". Leap month is calculated, and it is not a fixed month order except 1 1 month, 1 February and1month in the lunar calendar.

To sum up, leap year is a phenomenon in the solar calendar. It is fixed in February, which is 29 days longer than the normal year. Leaping moon is a phenomenon in the lunar calendar. It is a leap month, and the lunar calendar of that year has 13 months. That year was called leap month year, with a history of 384 years.

February 28th Source:

The origin of February 28th was in 46 BC, when Julius Caesar, the ruler of ancient Rome, presided over the formulation of the solar calendar, stipulating that in the annual 12 months, every single month is 3 1 day, and every bimonthly is 30 days. According to the custom of ancient Rome, February is the month of execution, which is considered unlucky and should be shorter, so there are only 29 days. Later Augustus became the emperor of Rome. I was born in August, but I actually had a miscarriage, so I ordered that August be changed to a big month, and all the two months in the second half of the year be changed to a big month, and the month of September 1 1 was changed to a small month, and the missing day was still deducted from mid-February. Therefore, there are only 28 days left in poor February.

In the calendar years of the China lunar calendar, the year with leap month is called leap month year (referred to as leap year). The general year is 12 months, 354 or 355 days, and the leap year is 13 months, 383 or 384 days. As a kind of lunar calendar, the number of days in each month depends on the monthly loss, and the time of one year is 18. In order to close the earth's orbit around the sun, that is, the tropic year, one month is added every two to four years, and the added month is a leap month, so the leap year of the lunar calendar is 13 months.

There is no thirteenth month in the lunar calendar. According to the calendar rules, leap months are repeated in the same month from February to 10, and the repeated months are leap months. For example, the leap month after April is called leap April.

Lunar leap year leap month calculation, three-year leap, five-year leap, 19 leap; The lunar calendar basically has a period of 19, which corresponds to the same time in the Gregorian calendar. For example, the dates 200 1, 1982 and 1963 in the Gregorian calendar are the fifth day of leap April.

Gregorian calendar 1982-2042 and lunar leap year leap month comparison table

The year of the leap month (the first day) in the Gregorian calendar month.

65438+May 23rd 0982, leap April, small non-year.

1984165438+1October 23rd, October of leap year.

1July 26, 987, leap June, big year.

1June 23, 990 leap in May, that is, the great year of Gengwu.

1April 22, 993 March of leap year.

65438+September 25th, August of leap year 0995.

1June 24, 998, leap in May, small Wuyin year

May 23, 2006 5438+0 leap April, Xin Sinian.

March 2 1 day, 2004, is the February of Shen Jianian.

August 24, 2006, leap July, year of Dapu.

June 23, 2009, leap May, the year of ugliness.

20 12 may 2 1 leap April, the year of Xiao renchen.

1October 24, leap in September, Xiao Wu's good year.

2065438+July 23, 2007, leap June, Dading Younian.

May 23, 2020, jumped into April, the year of the little boxer.

March 22, 2023, leap February, the year of the Great Guimao.

July 25, 2025, leap June, has been four years.

June 23, 2028, leap in May.

April 22, 20031year, leap March, 1911.

August 25th, 2033, the year of leap in July.

July 23, 2036, leap June, Xiao Chen Bing Year.

June 22, 2039, leap in May, has not yet reached the end of the year.

March 22, 2042, leap February, a year of great uncertainty.