Is there a leap month and how many? How is it calculated?

Is there a leap month and how many? How to calculate?

List of leap months:

1949 Leap July 1952 Leap May 1955 Leap March 1957 Leap August 1960 Leap June

1963 Leap April 1966 Leap March 1968 Leap July 1971 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 2001 Leap April

2004 Leap February 2006 Leap July 2009 Leap May 2012 Leap April 2014 Leap September

2017 Leap June 2020 Leap April

Why is there a leap month in the lunar calendar? --The reason for having a leap month in the lunar calendar is to harmonize the return year with the lunar year.

What is the conflict between regression year and lunar year? Remember: the total length of the regression year is 365.2422 days, and the length of the lunar month is 29.5306 days.

Twelve lunar months make up the lunar year, the length of which is 29.5306 × 12 = 354.3546 days, which is 10.88 days less than the regression year, which is about to be nearly 11 days, and 0.91 days less than each month, which is nearly 1 day.

According to this, if the Spring Festival of a lunar year is a snowy winter, the Spring Festival of the second year will be 11 days ahead of the season, and the 16th lunar year will appear in the red hot summer.

If the thirteen lunar months constitute the lunar year, the length is 29.5306 × 13 = 383.8978 days, which is more than 18 days more than the return year.

If the calendar is formulated according to the above, there will be a strange phenomenon that the celestial time does not fit with the calendar, and the time sequence is wrong and upside down - this is the contradiction.

In order to overcome this shortcoming, our ancestors, on the basis of astronomical observation, worked out the method of "intercalary month", which ensured that the first month of the lunar year from January to March would be in the spring, from April to June would be in the summer, from July to September would be in the fall, and from October to December would be in the winter, and at the same time ensured that the beginning of the year of the lunar calendar would be in the end of the winter and the beginning of the spring.

The mid-month of the lunar year is based on the length of the lunar month, 29.5306 days, so the big month is 30 days and the small month is 29 days. To ensure that the first day of the month (the first day of the month) must be the solstice, it makes the arrangement of the big and small months is not fixed, but need to be determined by strict observation and calculation. Therefore, two consecutive months in the lunar calendar is a big month or a small month is often the case, and even appeared in 1990, such as March and April is a small month, nine, ten, eleven, twelve consecutive four months is a big month of the rare exception.

So how often do you add a leap month? The best way is to find the least common multiple of the number of days in the return year and the number of days in the lunar month: we want the number of days in the m return years to be equal to the number of days in the n lunar months, that is, there should be the equation:

m×365.2422=n×29.5306

We can't directly find out m and n in this equation, but we can find out their ratio:

The approximate values of this ratio are:

In these fractional equations, the numerator represents the number of return years and the denominator represents the number of solstice months. For example, the sixth fractional equation indicates that seven leap months must be added to the 19 return years.

Comparison of the results of adding 7 leap months to 19 regression years:

19 regression years = 19 × 365.2422 = 6939.6118 (days)

A lunation has 29.5306 days, and 235 lunations = 235 × 29.5306 = 6939.6910 (days)

With the addition of 7 leap months to the 19 regression years After adding 7 leap months to the 19 regression years, the contradiction is eliminated to a difference of only: 6939.6910 - 6939.6018 = 0.0892 (days) - i.e., more than 2 hours and 9 minutes, which is accurate enough.

Therefore, the lunar calendar uses 19 years plus seven leap months, that is, "nineteen years, seven leap method", the return year and the lunar year is well coordinated, so that the lunar New Year's Day (Spring Festival) is always kept in the late winter and early spring. The ancients called the 235 lunar months "leap weeks".

The method of intercalation in the lunar calendar allows the average length of the lunar year to be close to the year of return, and the lunar months in the lunar calendar are characterized by distinctive lunar phases, maintaining the best of both worlds: the Gregorian calendar and the lunar calendar.

Now the intercalary method is between the two solstices, if there are only 12 months, then no intercalary, if there are 13 months, then intercalary. The leap month starts from the "winter solstice", when the first month without "mid-air" appears, this month is a leap month, the name is in front of the previous month plus a "leap" word.

Which month of the lunar calendar is leap? It is determined by the 24 solar terms of the year.

The Chinese lunar calendar divides the twenty-four solar terms into twelve solar terms and twelve mid-term solar terms.

The lunar calendar uses the moon as its cycle (the lunar calendar), and the twelve lunar calendars have a total of **** about 354 days; together with the annual calendar (the solar calendar), which is compiled based on the cycle of the seasons resulting from the Earth's rotation. The monthly calendar is shorter than the annual calendar, with a difference of 11 days, so seven extra leap months are added every 19 years to make up for the error. To decide which month to be a leap month, it depends on the 24 solar terms, the lunar month usually contains a solar term and a middle term, such as the hibernation/autumn equinox, etc. If a lunar month only has a solar term but not a middle term, the calendar will add an extra month to that month as a leap month. In 2006, for example, the seventh month of the lunar calendar was a month with a festival but no mid-air, so it was a leap month to adjust the error.

The dates of the 24 solar terms in the lunar calendar are delayed from month to month, so in some lunar months, the mid-air falls at the end of the month, and there is no mid-air in the next month.

In general, every two years there is a month without a mid-air, which coincides with the need to add a leap month of the year in line. That's why the Lunar Calendar makes the month with no mid-air a leap month.

For example, in 2001, the 29th day of the 4th month of the lunar calendar is the mid-month full moon, and the first day of the next month is the summer solstice, which is a month without a mid-month.

How to calculate leap year and leap month

In the Gregorian calendar, the year with leap day is called a leap year, which is 365 days in a normal year and 366 days in a leap year. Since the Earth orbits the Sun in a period of 365 days, 5 hours, 48 minutes and 46 seconds (365.24219 days), which is a regression year, the Gregorian calendar makes a year 365 days. The remaining time is about four years cumulative day, added to the month of February, so the usual year 365 days per year, February for 28 days, leap year 366 days, February for 29 days. Thus, there are 97 leap years in every 400 years, with one day added to the end of February for a leap year of 366 days. Calculation of leap year: the number of years in the AD can be divided by four, that is, a leap year; is divided by 100 and can not be divided by 400 for a flat year; is divided by 100 can also be divided by 400 for a leap year. For example, 2000 is a leap year, while 1900 is not.

In the Chinese old lunar calendar, a year with a leap month is called a leap year. A typical year has 12 months and 354 or 355 days, while a leap year has 13 months and 383 or 384 days. Lunar calendar as a kind of yin and yang calendar, the number of days per month in accordance with the lunar deficit, the time of the year to 12 months as the basis; in order to fit the cycle of the Earth's orbit around the Sun, that is, the return of the year, every two to four years, increase by one month, the increase in the month for the leap month, so the leap year of the Lunar Calendar for the 13-month period.

The lunar calendar does not have a thirteenth month, leap month in accordance with the rules of the calendar, emissions from February to October after the repetition of the same month, the repetition of the month for the leap month, such as April after the intercalary month known as leap April.

The leap year and leap month of the lunar calendar, 3 years a leap, 5 years two leap, 19 years seven leap; the lunar calendar is basically 19 years for a cycle corresponding to the same time in the Gregorian calendar. For example, the day of May 27, 2001, May 27, 1982 and May 27, 1963 in the Gregorian calendar is the fifth day of the leap month.

Which month the leap month is added to is deduced from the rules of the lunar calendar, which is mainly determined according to the conformity with the twenty-four seasons of the lunar calendar;

The number of days of the leap month in the lunar calendar is the same as that of the normal month, which is 29 or 30 days.

The so-called "leap" in the lunar calendar is only a leap year and a leap month, and the Gregorian calendar also has a leap year.

Comparison table between 1982 and 2042 in Gregorian calendar and leap year and leap month in Lunar calendar

Month in Gregorian calendar Leap month (first day) Stem and branch year

1982 May 23 Leap April small 壬戊年

1984 November 23 Leap October big 甲子年

1987 July 26 Leap June big 丁卯年

June 23, 1990 Leap 5th month Grand Gung Ng Year

April 22, 1993 Leap 3rd month Grand Dec. Year

September 25, 1995 Leap 8th month Grand B H Year

June 24, 1998 Leap 5th month Small E Yin Year

May 23, 2001 Leap 4th month Grand Sin Si Year

March 2004 21st day of leap 2nd month big year of Koshin

2006 Aug 24th day of leap 7th month big year of Cing E

2009 Jun 23rd day of leap 5th month big year of Hexiong

2012 May 21st day of leap 4th month small year of 壬辰/p>

2014 Oct 24th day of leap 9th month small year of A Wu

2017 Jul 23rd day of leap 6th month big year of Year of Ding You

May 23, 2020 Leap 4th month small Year of Heng Zi

March 22, 2023 Leap 2nd month large Year of Decimal

July 25, 2025 Leap 6th month large Year of He Si

June 23, 2028 Leap 5th month large Year of E Shen

April 22, 2031 Leap 3rd month large Year of Xin Hai

August 25, 2033 Leap 7th month is big in the year of 癸丑

July 23, 2036 Leap 6th month is small in the year of 丙辰

June 22, 2039 Leap 5th month is big in the year of 己未

2042 March 22, 2042 Leap 2nd month is big in the year of 壬戊

2004 is a "Leap Year" on Gregorian calendar. "The month of February has 29 days, which is one day more than the 28 days of February in a normal year. Ancient Egyptians and Chinese calendars of the Spring and Autumn Period measured the year as 365 days. In fact, the earth around the sun for one week (that is, the solar calendar year) for 365 days 5 hours 48 minutes 46 seconds. In this way, four years will be 23 hours, 15 minutes and 4 seconds more time, close to the time of day (24 hours), so the calendars will be set every four years a "leap year", that is, in February of the year to add a day, which is also known as the "leap day", and later on the provisions of Later, 97 leap years were established every 400 years.

2004 is the year of the lunar calendar, also a leap year, the lunar calendar called "leap month", that is, an extra month in a year, for 13 months. China's ancient calendar in the Taiyin (moon) calendar, is the cycle of the moon for a month, the odd-numbered months for the big month of 30 days, the even-numbered months for the small month of 29 days, a year for 354 days, which is less than the time the Earth revolves around the sun more than 11 days, 3 years less than more than 33 days, so the calendars provide for every 3 years to set a "leap month". For the sake of accuracy, it is also stipulated that in 19 years to place 7 "leap month" year

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1989 there is a leap month, how many months is it? What is a leap month?

Leap month refers to the month added to the lunar calendar in every leap year (in order to harmonize the contradiction between the return year and the lunar year, to prevent the lunar year and month from being out of sync with the return year and the four seasons, one leap is placed every two to three years, and seven leaps are placed in 19 years). Sometimes, leap month also refers to the month that contains a leap day in a leap year (specifically, February in a leap year in the Gregorian calendar).

Leap month in the lunar calendar and its calculation Why is there a leap month in the lunar calendar? What is the conflict between the regression year and the lunar year? First, remember: the total length of the regression year is 365.2422 days, and the length of the lunar month is 29.5306 days. Twelve lunar months make up the lunar year, the length of which is 29.5306 x 12 = 354.3672 days, which is 10.88 days less than the regression year, or nearly 11 days, and 0.91 days less than each month, or nearly 1 day. Accordingly, if the Spring Festival of a certain lunar year is a snowy winter, the Spring Festival of the second year will be 11 days ahead of the season, and the sixteenth lunar year will appear in the red hot summer. If the thirteen lunar months were used to form a lunar year, the length would be 29.5306 x 13 = 383.8978 days, which is more than 18 days longer than the return year. If the calendar is formulated according to the above, there will be a strange phenomenon that the celestial time and the calendar do not match, and the time sequence is wrong and upside down - this is a contradiction. In order to overcome this shortcoming, our ancestors, on the basis of astronomical observations, worked out the method of "intercalary month", which ensured that the first month of the lunar year from January to March would be in spring, from April to June would be in summer, from July to September would be in autumn, and from October to December would be in winter, and at the same time ensured that the beginning of the year of the lunar calendar would be at the end of the winter and the beginning of the spring. The mid-month of the lunar year is based on the length of the lunar month, which is 29.5306 days, so the big month is 30 days and the small month is 29 days. To ensure that the first day of the month (the first day of the month) must be the solstice, it makes the arrangement of the big and small months not fixed, but need to be determined by strict observation and calculation. Therefore, the lunar calendar for two consecutive months is a big month or a small month is often the case, and even appeared in 1990, such as March and April is a small month, nine, ten, eleven, twelve consecutive four months is a big month of rare exceptions. So how long plus a leap month? The best way is to find the number of days of the return year and the number of days of the lunar month of the smallest common multiple: we hope that the number of days of m return year and n days of the lunar month are equal, that is, there should be the equation: m × 365.2422 = n × 29.5306 in this equation we can not directly find out the m and n, but you can find out the proportion of them: the approximate value of this proportion are: in these equations, the numerator In these fractional equations, the numerator represents the number of return years and the denominator represents the number of solstice months. In these fractions, the numerator represents the number of return years and the denominator the number of solstice months. For example, the sixth fraction indicates that seven leap months must be added to the 19 return years. Comparison of the results of adding 7 leap months to 19 regression years: 19 regression years = 19 x 365.2422 = 6939.6018 (days) A lunar month has 29.5306 days, 235 lunar months = 235 x 29.5306 = 6939.6910 (days) After 7 leap months are added to 19 regression years, the contradiction is eliminated to the extent that the difference is only 6939.6910 - 6939.6018 = 6939.6910 - 6939.6910 (days). 6939.6018 = 0.0892 (days) - i.e., more than 2 hours and 9 minutes, which is accurate enough. Therefore, the lunar calendar uses 19 years plus seven leap months, that is, "nineteen years and seven leap method", the return year and the lunar year is well coordinated, so that the lunar New Year's Day (Spring Festival) is always kept in the late winter and early spring. The ancients called the 235 lunar months "leap weeks". The method of intercalation in the lunar calendar allows the average length of the lunar year to be close to the year of return, while the lunar months in the lunar calendar are characterized by distinctive lunar phases, maintaining the best of both worlds, the Gregorian calendar and the lunisolar calendar. Nowadays, the method of intercalation is that between two winter solstices, if there are only 12 months, then no intercalary, if there are 13 months, then intercalary. The leap month starts from the "winter solstice", and when the first month without "mid-air" occurs, this month is a leap month, and its name is in front of the previous month to add the word "leap". Which month of the lunar calendar is intercalary? It is determined by the twenty-four solar terms of the year. The Chinese lunar calendar divides the twenty-four solar terms into twelve solar terms and twelve middle terms. The dates of the twenty-four solar terms in the lunar calendar are postponed month by month, so that in some lunar months, the mid-qi falls at the end of the month, and there is no mid-qi in the next month. Generally every two years or so there is a month with no mid-qi, which is exactly the same as the year that requires a leap month. Therefore, the lunar calendar stipulates that the month with no mid-air is a leap month. For example, in 2001, the 29th day of the fourth month of the lunar calendar is the middle of the small full, and then the first day of the next month is the middle of the summer solstice, in which there is no middle month, it is designated as a leap month, which is followed by April, so it is called the fourth month of the month of June. For more information about the leap month of the lunar calendar, please see "in the gas and leap month", "nineteen years seven leap law" This year's lunar calendar leap in July will not have two Tanabata Festival This year is the year of Cixu, leap in the seventh month. So why is there a leap month in the lunar calendar? Leap month is how to calculate it? "Double spring leap month" is a rare phenomenon? Leap July will not have two "Tanabata Festival"? With a variety of issues, the reporter yesterday interviewed a member of the Chinese Astronomical Society, many years dedicated to the popularization of knowledge of astronomy Li Defan and the famous folklore expert Ni Baocheng. Lunar intercalary month and the festival Li Defan said that China's lunar calendar is commonly known as the lunar calendar, in fact, it is not the real lunar calendar, but both the lunar calendar and the solar calendar of the length of the yin and yang combination of the calendar. A cycle of changes in the height of the sun's shadow at noon is called a regression year, and its cycle is 365.2422 days. The length of the regression year has a fractional part, which is not convenient for the actual chronology, so the solar calendar sets the total number of days in a year as 365 or 366 (leap year). The lunar calendar takes the moon's cycle of waxing and waning as one month, and the monthly cycle is 29.5306 days. In order to make the lunar calendar does not carry a decimal, but also accurately reflect the moon's cycle of changes in the moon, ad hoc "moon small", "moon big" two cases, the month is small for 29 days, the month is big for 30 days. In this way, with 12 months as a year, the whole year is only 354 days or 355 days, which is about 11 days less than the number of days in a year of the solar calendar. In order to make the average length of the lunar year close to the regression year, the method of "19 years and 7 leap months" was adopted, so that 7 out of every 19 years have 13 months, so that the head of the year is always around the time of the first spring. Lunar leap month in three or two years on the leap once, we all know. So what is the rule of leap months? Li Defan said, leap months are possible, but not many leap two months before and after the Spring Festival, rarely heard of two Spring Festival. Lunar leap which month is based on the twenty-four seasons to determine the twenty-four seasons, twenty-four seasons in twelve "festival", twelve "in the gas", "festival", The "festival" and "mid-qi" are next to each other, such as the spring is the "festival", rain is the "mid-qi". Normally there must be a "mid-qi" in each month, and the month without "mid-qi" is set as the leap month of the previous month. This year is the leap month of the lunar calendar, the first lunar month of July from July 25 to August 23, August 7 is the beginning of the autumn (the lunar month of the festival), August 23 is the summer heat (the middle of the lunar month of July). The next lunar month runs from August 24 to September 21, and this month only has the "solar term" of Bai Lu (White Dew) on August 8 without the "mid-air", so it is a leap month in the seventh month of the lunar calendar. "Double spring" is not rare The proverb has a cloud: double spring and leap month, the marriage of a good year. Perhaps by the influence of this statement, this year, more married children, "double spring and leap month" is really very rare? Li Defan said, "double spring and leap month, good time to get married year," the argument is no reason. Lunar leap month year is 13 months, 13 months contains 383 days or 384 days, more than the number of days in the solar calendar year about 18 days. 18 days has exceeded the length of a festival, so the lunar leap year will contain 25 festivals, that is, there are two spring. This year belongs to this situation. This situation is not uncommon. Such as the first spring of the Year of the Monkey is February 4, 2004, and February 4, 2005 is the second spring of the Year of the Monkey, because February 9, 2005 before entering the Year of the Rooster, which is a year of double spring, the year is the leap month of the lunar calendar. Lunar calendar as long as there is no leap month of the year will certainly not have "double spring", there is a leap month of the year will generally have "double spring". Will not have two Tanabata Festival This year is a leap month in the lunar calendar, the seventh day of the seventh month is the traditional Tanabata Festival, then will not have two Tanabata Festival? Folklore expert Ni Bao Cheng said: "China's traditional festivals have a fixed date, Tanabata Festival is the seventh day of the seventh month of the lunar calendar, once a year. The seventh day of the seventh month in the leap month is not the Tanabata Festival, and no one will go there. This is true for the Tanabata Festival, as well as other traditional Chinese festivals such as the Dragon Boat Festival, the Mid-Autumn Festival and the Chongyang Festival." Chief Reporter Zhang Tiyi Comparison table between 1982 and 2042 on the Gregorian calendar and leap month of leap year on the lunar calendar The month in the Gregorian calendar Leap month (the first day of the first month) Stem year 1982 May 23 Leap 4th month small 壬戊年 1984 November 23 Leap 10th month big 甲子年 1987 July 26 Leap 6th month big 丁卯年 1990 June 23 Leap 5th month big 庚午年 1993 April 22 Leap 3rd month big Dec. 25th, Sep. 25th, 1995 Leap 8th month big B. H. Year 1998 June 24th, leap 5th month small E. C. Year May 23rd, 2001 Leap 4th month big X. S. Year March 21st, 2004 Leap 2nd month big A. S. Year August 24th, 2006 Leap 7th month big C. E. Year June 23rd, 2009 Leap 5th month big H. O. Year May 21st, 2012 Leap 4th month small N. C. Year October 2014 24th day of leap 9th month small A Wu year 2017 July 23rd day of leap 6th month large Ding You year 2020 May 23rd day of leap 4th month small Heng Zi year 2023 March 22nd day of leap 2nd month large Dec Mao year 2025 July 25th day of leap 6th month large He Si year 2028 June 23rd day of leap 5th month large E Sheung year 2031 April 22nd day of leap 3rd month large Xin Hai year 2033 August 25th day of leap 7th month large Dec Ugly year July 23, 2036 Leap 6th month small Cincinnati June 22, 2039 Leap 5th month big Hewei March 22, 2042 Leap 2nd month big Nianwu

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Is there a leap month in 1996? What month was it?

There was no leap month

In 2004, there was no leap month in the lunar calendar

In 2004, there was a leap month in the lunar calendar.

Gregorian calendar: March 21, 2004

Lunar calendar: the first day of the leap second month in the year of Jiashen

Stem branch: Jiashen Dingmao 己亥

Why is there a leap month? How to calculate the leap month!

There are two Julys in the Chinese lunar calendar that are leap months, so what is a leap month?

Leap, in its original meaning, is a remainder. It refers to the difference between the calendar year and the Earth's orbit around the sun, and the extra time is called "leap".

A leap year is a year in which there is a leap day in the solar calendar (29 days in February) or a leap month in the lunar calendar (13 months in a year); a leap year is a year in which there is a leap in the lunar calendar. The difference between the lunar calendar and the return year)

Leap day, in the solar calendar, there are only 365 days in a normal year, the difference is 5 hours, 48 minutes and 46 seconds in the return year, so every four years, one day will be added to 29th day of February, which is called the leap day, and the year is called the leap year

Leap month, in the lunar calendar, the difference is about 10 days, 21 minutes and 46 seconds in the return year, which is the difference of the lunar calendar, the difference is about 10 days, 21 seconds. The month added to a leap year is called a leap month. The leap month is added after a certain month. It is called intercalary month

Leap month, leap year

In order to adjust the average length of a calendar year to match the length of a return year, it is sometimes necessary to adjust the length of an individual month or to increase the number of months in a year. The adjusted or added month is called a "leap month".

Leap month was first invented in China around 500 BC, more than 160 years earlier than in ancient Greece. China's calendar adopts the method of nineteen years and seven leap months, which is different in different periods and countries.

In the traditional Chinese lunar calendar to the length of the first month 29.5306 days for the average value of 1 month, 12 months of the year, with the return of the length of the year 365.2422 days difference of about 10 days and 21 hours, the need for intercalary, so that the lunar calendar month and the phenomena of the sky and the weather to maintain the corresponding relationship. China's ancient six calendars with 3 years leap 1 month, 5 years leap 2 months, 19 years leap 7 months of the intercalary month method, the month added in each leap year will be called "intercalary month". The leap month was placed at the end of the year, for example, the Zhuan Xiang Calendar used during the Qin Dynasty and early Western Han Dynasty, with October as the first month of the year, and September as the end of the year, the leap month was placed after September, and was called the "latter September". At the beginning of the Western Han Dynasty, when the Taichu Calendar was developed, the leap month was inserted in each month of the year, and it was stipulated that the months that did not have a mid-air were taken as the leap months, and the monthly sequence was still used as the previous month's sequence, as long as it was referred to as the "intercalary month". This intercalary rule was the most reasonable among the calendars that adopted the Pingqi. In the Qing Dynasty, when the constitutional calendar was changed to the fixed-qi calendar, it was possible to set two leap months in a year if the rule of placing an intercalary in the center was not continued. Therefore, it was added that a leap year with 13 months between the two winter solstices was designated as a leap year, and the first month of the leap year without a center was designated as a leap month. This rule is still in use today. Leap years are most frequent in leap years 4, 5, and 6, least frequent in leap years 9 and 10, and leap months 11, 12, and the first month do not occur, at least not for thousands of years.

In the Gregorian calendar, a leap month does not add a month to the year, but rather adds a day to a particular month to ensure that the calendar year coincides with the year of return. For example, both the Julian Calendar and the current Gregorian Calendar have a general year of 365 days. The month of February is usually added by one day every four years (sometimes eight years apart in the current calendar), making the year 366 days. February of that year is a leap month, and that year is also called a leap year.

Leap year, leap month is how to calculate

The calendar is not a leap month, every four years a leap year, so the solar birthday, if the person was born on February 29, naturally 4 years a birthday. But since you say it is a leap month birthday, that you are according to the lunar calendar to celebrate the birthday, because the Chinese people use the calendar, only the lunar calendar is a leap month.

First, leap year is divided into "Gregorian" and "Lunar" calendar

The concept of leap year in Gregorian and Lunar calendars is not the same. The leap year we often talk about is actually a leap year in the Gregorian calendar.

A year with a leap day in the Gregorian calendar is called a leap year.

A year with a leap month in the lunar calendar is called a leap year.

The leap year in the Gregorian calendar and the leap year in the lunar calendar do not coincide, such as 1995, 2001, the lunar calendar is a leap year, the Gregorian calendar is not a leap year; and 2000, the Gregorian calendar is a leap year, the lunar calendar is not a leap year. Here is a 1982-2042 comparison.

Second, the determination of the leap year in the Gregorian calendar

The general knowledge is that 4 years a leap, can be divided by 4 years is a leap year, in fact, this is not quite true. In the end, which years are leap years? How do you determine a leap year?

In the Gregorian calendar, the year with a leap day is called a leap year, the average year is 365 days, and a leap year is 366 days. Since the Earth orbits the Sun in a period of 365 days, 5 hours, 48 minutes and 46 seconds (365.24219 days), which is a regression year, the Gregorian calendar designates a year as 365 days. The remaining time is accumulated in about four years and added to one day in February and fixed in February, so a normal year is 365 days per year, with 28 days in February, and a leap year is 366 days per year, with 29 days in February. There are 97 leap years in every 400 years.

The usual way of calculating leap year: the number of years in AD can be divided by 4, which is a leap year; however, the year divided by 4 is not necessarily a leap year, for example, 1700, 1900, is not a leap year. The year of the turn of the century, is divided by 100 and can not be divided by 400 is a flat year; is divided by 100 can also be divided by 400 is a leap year. For example, 2000 AD is a leap year, while 1000 and 3000 AD are not. Here is a leap year formula, you can see if you are interested.

Third, the lunar calendar leap month of the projection

The lunar calendar has a leap month of the year known as the leap month year, but now customarily also known as the leap year (and therefore easy to confuse with the leap year of the Gregorian calendar). A typical year has 12 months and 354 or 355 days, while a leap year has 13 months and 383 or 384 days.

There is no thirteenth month in the lunar calendar. Leap month is a month that repeats itself after February through October according to the rules of the calendar, for example, April is called Leap April.

The rule of leap year in the lunar calendar is three years a leap, five years two leap, 19 years seven leap, leap month specifically added to which month, in accordance with the rules of the lunar calendar to infer, mainly in accordance with the twenty-four seasons of the lunar calendar to determine the conformity of the month, usually only one of the seasons of the month (usually a small month) is set to make up for the intercalary month. The number of days in a leap month in the lunar calendar is the same as the number of days in a normal month, which is 29 or 30 days.

The lunar calendar basically has a 19-year cycle corresponding to the same time in the Gregorian calendar. For example, the days of May 27, 2001, May 27, 1982 and May 27, 1963 in the Gregorian calendar are the fifth day of the leap month.