Why is there a run in April, and why is there a run in February?

In the old Chinese lunar calendar, a year with a leap month was called a leap year. A normal year is 12 months, 364 or 365 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 lunar calendar does not have the title of the thirteenth month, and the leap month is repeated in the same month from February to October according to the rules of the calendar, and the repeated month is called the leap month, such as the leap month after April is called leap April.

The Chinese lunar calendar is a kind of "lunisolar calendar": the day is recorded by the rotation of the earth, the month by the rotation of the moon, and the year by the rotation of the earth.

Since the Earth's orbital period is not an integer multiple of the Moon's orbital period, in this way, the lunar calendar and the Gregorian calendar are "out of sync".

For adjustment, the lunar calendar adds a "leap month" in the appropriate year.

The usage of the leap month is "seven runs in nineteen years". That is, seven leap months in nineteen years. Therefore, the lunar calendar coincides with the Gregorian calendar every nineteen years.

As for adding to **, it depends on the specific situation of that year.

Take a closer look at the [Perpetual Calendar] and it will be clear at a glance.

The Chinese lunar calendar is actually a lunar calendar, with the moon revolving around the earth as a month, and this cycle is about 29 and a half days, but a month cannot have half a day, so each month of the lunar calendar is either 30 days or 29 days. In this way, there are only 354 or 355 days in a year, and everyone knows that there are 365 days in a year, and there is a difference of about ten days in a year, so in order to synchronize with the solar calendar, there used to be a leap month every four years, but in the end, it will be a little worse, and the current lunar calendar stipulates that there are seven leaps every 19 years, so you will find that everyone's 19-year-old, 38-year-old, and 57-year-old birthday, the solar calendar and the lunar calendar will be on the same day.

The correct way to write the travel paragraph is: leap April, which means that there are two Aprils in a year. The lunar calendar serves as a lunisolar calendar.

The number of days per month is determined by the monthly loss, and the time of the year is based on 12 months; In order to coincide with the Earth's cycle around the Sun, the return year, one month is added every 2 to 3 years, and the additional month is a leap month. Leap April is a common leap month that occurs every 8 or 11 years.

Take the phases of the moon. Scheduling. It calculates the date and time of the conjunction of the sun and the moon one by one, and the first day of the month is the date of the conjunction; The size of the previous month is determined according to the number of days included in successive double conjunctions.

If the interval between this conjunction and the next conjunction is 30 days, then that month is the Great Moon; If it is only 29 days apart, it is a small month.

The order of the month is determined by the middle air. First of all, we know that a return year has 12 mid-terms, but it contains a new moon.

After several cycles of the calendar month, there will be one calendar month without the middle air. "Hanshu Legal Calendar" contains: "Shuo is not not in the middle, it is called a leap month".

This month without a neutral air is a leap month. It is a leap month when the previous calendar day is a month. For example, the leap month in 1984 occurred after the tenth month of the old calendar, hence the name "leap October".

Leap months are calculated and are not fixed in the order of the month of the year, except for the eleventh month of the lunar calendar.

Except for December and the first month, leap months are possible, and seven leaps in nineteen years.

The leap April years are 2001 and 2012Wang Chen2020 Gengzi year, 2058 Wuyin year, 2069 Jichou year, 2077 Ding You year, 2088 Wushen year, 2096 Bingchen year, etc.

The lunar calendar will have twenty-four solar terms.

It is divided into twelve solar terms and twelve middle terms, and the solar terms and middle terms appear at intervals, and there are twenty-four solar terms.

The date in the lunar calendar is postponed month by month, so some lunar months, the middle air falls at the end of the month, and the next month has no middle air, generally every two years or more there is a month without the middle air, which is exactly in line with the year that needs to add a leap month, so the lunar calendar stipulates that the month without the middle air is a leap month.

The 24 solar terms are the Chinese nation.

The fruits of the accumulation of long-term experience and the crystallization of wisdom of the working people, clothing, food and agriculture, according to the climate, with the passage of time, it is the language that nature speaks to us, worthy of each of us to listen.

Leap February is caused by the fact that the cycle of the Sun and Moon relative to the Earth is not the number of full days.

The appearance of leap February is blind celebration, because in the month after the second month of the lunar calendar, there is only the solar term "Qingming", and the mid-air "Gu Yu" after "Qingming" falls to the next month, so that there is a month without mid-air after February. Therefore, the month after February, which has no neutral air, is named "leap February" according to the name of February.

Leap February Introduction:

There are two Februarys in a lunar year, and the second February is a leap February. This is done to reconcile the return year with the lunar year. There are two calendars prevailing in most parts of China: one is the Gregorian calendar; The other is the lunar calendar, also known as the "summer calendar".

The solar calendar, also known as the solar calendar, is based on the return year. Since the length of the return year is equal to the average solar day (i.e. 365 days, 5 hours, 48 minutes and 46 seconds), it is not a whole number of days. Therefore, the solar calendar takes 365 days as the usual year, that is, the "common year".

In order to clear the gap between it and the actual return year, the Gregorian calendar uses the method of "intercalation" to add 97 days in 400 years; Or every four years, a day is added in February, which is the "leap year" of the solar calendar and the "leap February" of the solar calendar. <

2020 is a leap month in the year of Double Spring, why is there a leap month? This time I got it.

Leap April is a term in the Chinese lunar calendar, and if there is some kind of offense, there may be two Aprils this year, one April followed by another April, and then a leap April.

Leap April is the lunar calendar has two Aprils, this is a very normal phenomenon, sometimes it is hot in August, and there are also in February.

Leap April is two Aprils, which means that there are two Aprils in a year.

Said in October. In other words, there are two businesses in a year.

There are three types of calendars in the world: one is the solar calendar, which takes the time of the earth's orbit around the sun as a year, and the number of months in the year and the number of days in the month can be artificially determined; One is the lunar calendar, which is based on the time for the moon to orbit the earth in one month, and only the number of months in the year can be artificially determined; The third type is the lunisolar calendar, that is, the average time for the moon to make one revolution around the earth is one month, but by setting leap months, the average number of days in a year is equal to the time for the earth to revolve around the sun on average, such as the Chinese Chinese calendar and Tibetan calendar.

Therefore, the Chinese Han calendar is not a lunar calendar, but a lunisolar calendar.

Leap month refers to a phenomenon in the lunisolar calendar, the lunisolar calendar is according to the moon's circle and deficiency, that is, the synodic month arranges the big month and the small month, the length of a synodic month is the day, is the cycle of the moon phase of profit and loss, the lunisolar calendar stipulates that the big month is 30 days, the small month is 29 days, so that there are 12 months in a year, the lunisolar calendar months have no seasonal significance, so that the twelve synodic months constitute the Han calendar year, the length is days, less than the return year day (that is, nearly 11 days), each month less days (nearly 1 day). The difference between a year and a year in the Gregorian calendar is only 17 years, and the lunisolar date is inverted with the season. For example, if you spend the New Year in the snow, 17 years later, you will celebrate the New Year.

Naturally, the use of such a calendar cannot meet the needs of agricultural production. Therefore, since the Qin and Han dynasties, China's lunisolar calendar has been parallel to the 24 solar terms, and the 24 solar terms are used to guide agricultural production.

If the lunar year is composed of thirteen synodic months, the length is days, which is more than 18 days longer than the return year.

If the calendar is formulated according to the above provisions, there will be a strange phenomenon that the time of day does not match the calendar, and the time sequence is reversed. That's the contradiction.

In order to overcome this shortcoming, our ancestors found the method of "leap month" on the basis of astronomical observations, ensuring that the first month of the lunar year is spring to March, April to June is summer, July to September is autumn, and October to wax is winter, and at the same time to ensure that the first lunar year is in late winter and early spring (all of the above refer to lunar months).

Leap month calculation.

Which leap month of the lunar calendar depends on the twenty-four solar terms of the year. The Chinese lunar calendar divides the 24 solar terms into 12 solar terms and 12 middle terms.

The current method of intercalation is between the two winter solstices, if there are only 12 months, there is no intercalation, if there are 13 months, there is an intercalation. The intercalary month begins with the "winter solstice", and when the first month without "Zhongqi" appears, this month is the intercalary month, and its name is preceded by the word "intercalary" in front of the previous month.

The reason why there is a run February:

Leap February refers to the addition of one day in a leap year, i.e. one day in February, which becomes 29 days. This is because the period of the Earth's revolution around the Sun is not an integer, but 365 days, 5 hours, 48 minutes and 46 seconds, so it is necessary to add an additional day every four years to make up for this gap. The rules for leap years are:

A Gregorian calendar year is a leap year if it is a multiple of 4 and not a multiple of 100, or a multiple of 400. For example, 2000 is a leap year and 1900 is not a leap year. The existence of leap February makes leap years longer than usual, buried by one day, i.e. 366 days.

Summary. Leap April: 1906 (Bingwu year (Yi Chou year (Jiashen year (癸卯 year ( Jiayin year (壬戌 year) 2001 ( Xin 巳 year (壬辰 year (庚子 year) and so on.

Leap April, there is a trembling in 1906 (Bingwu year (Yi Chou year (Jia Shen pretending to be filial piety year (癸卯厅 and manuscript year (Jiayin year (壬戌 year) 2001 (Xin Si year (壬辰 year (Gengzi year) and so on.

Around the 21st century, leap April is a common intercalary month with nucleus, which generally occurs once every 8 or 11 years, and the longest interval is 38 years, and the frequency is second only to leap May.

The leap month of April occurs because the length of a year in the lunar calendar is not equal to 365 days, but about 354 days, and hail is about 11 days shorter than the solar calendar. In order to keep the lunar calendar and the solar calendar in sync with a certain source, one month should be added every few years to adjust, and this month is a leap month. Leap months usually occur in the first half of the lunar calendar, while leap April is a relatively rare month.