What does it mean to leap into August? How often does leap August happen?
What does it mean to leap into August?
Leap August, according to the lunar calendar, refers to the second August after August in a year 13 months. The earliest Mid-Autumn Festival and the latest Double Ninth Festival usually leap in August.
Leap August is a leap month with medium frequency, which is second only to leap April, leap June and leap July. Generally, it occurs once every 19 years (such as 1957 and 1976), and sometimes it occurs once every 8 years (such as 2454 and 2462) or 165438. When there is an interval of 38 years (such as 1680, 17 18) or a multiple of 19 (such as 2845,2921year, with an interval of 76 years, 76 is/kloc-0). For example, in 2462 and 2557, the interval is 95 years, and 95 is 5 times of 19), while in other cases, the interval is greater than 19 but not greater than 38 years (for example, in 2796 and 2826, the interval is 30 years), or even more, it is greater than 100.
The 20th century 1957 (ding younian), 1976 (Chen bingnian), 1995 (yihai year) jumped into August, 2 1 century, 2052 (ren shennian) and 2007/kloc.
Leaping in August, the Spring Festival date is generally 065438+1October 30 or 065438+1October 30, and some Spring Festival dates are February 0 1 day (e.g.19th century185/kloc-0) Generally, the date of the Spring Festival in the following year is February 18 or February 19, some leap years are February 17, and very few leap years are February 20.
There is no leap in August in the 22nd century.
The origin of leap month
In order to adjust the average length of calendar year to match the length of tropical year, it is sometimes necessary to adjust the length of individual months or increase the number of months in a year. This adjusted month or added month is called "leap month".
The leap month calendar was first invented and used in China. It started around 500 BC, which was 160 years earlier than ancient Greece. The calendar of our country adopts the method of seven leap months in nineteen years, which is different in different periods and countries.
In the traditional Chinese lunar calendar, when the length of the first lunar month (29.5306) is the average of 1 month, that is, 12 months in a year and the length of the tropical year (365.2422) is about 10 and 2 1 day, it is necessary to set a leap. In the six-year calendar in ancient China, the leap month method was adopted, with three years 1 month, five years and two months, and 19 years and seven months. Every month in a leap year is called "leap month". The leap month is placed at the end of the year. For example, the seal script used in the early years of the Qin Dynasty and the Western Han Dynasty started in October and ended in September. Leap month is placed after September, which is called "post-September". When the taichu calendar Law was enacted in the early years of the Western Han Dynasty, leap months were inserted in every month of the year, and it was stipulated that lifeless months were regarded as leap months, and the month sequence was still the month sequence of last month, so long as it was called "leap months". This leap rule is the most reasonable in a smooth calendar. In the Qing dynasty, the constitution continued, and it was changed into a fixed-atmosphere calendar. If we continue to simply follow the rule that there is no central leap, it is possible to set up two leap months a year. Therefore, the leap year is defined as 13 months between two winter solstices, and the first month of a leap year is defined as leap month. This rule has been in use ever since. In leap years, April, May and June are the most frequent, and September, 1 October are the least. 1 1 month,1February,1month will not appear, at least for several thousand years.
The origin of leap year
However, the leap year of the Gregorian calendar stipulates that the earth's revolution around the sun is called the tropic year, with 365 days at 5: 48: 46. Therefore, the Gregorian calendar stipulates that there are an average year and a leap year. The average year is 365 days, which is 0.2422 days shorter than the tropic year and 0.9688 days shorter than the four-year * *, so one day is added every four years. This year, there are 366 days, which is a leap year. However, an increase of one day in four years is 0.03 12 more than that in four tropic years, and it will be 3. 12 more in 400 years. So there are three leap years missing in 400 years, that is, there are only 97 leap years in 400 years, so the average length of the Gregorian calendar year is similar to that of the tropic year. Therefore, it is stipulated that leap years are only multiples of 400. For example, 1900 and 2 100 are not leap years.
Leap years are divided into "solar calendar" and "lunar calendar"
The concepts of leap year in solar calendar and lunar calendar are different. The leap year we often talk about is actually the leap year of the Gregorian calendar.
A year with a leap day in the solar calendar is called a leap year.
A year with a leap month in the lunar calendar is called a leap year.
The leap years of the solar calendar and the lunar calendar do not coincide. For example, the lunar calendar 1995 and 200 1 are leap years, but the solar calendar is not. In 2000, the solar calendar was a leap year, but the lunar calendar was not. The following is a comparison of 1982 -2042.