Is leap month regular? If there is a period of several years.

1, the law of leap month is as follows:

The earth goes around the sun once, and the number of months in a year cannot be odd zero, so there are only 354 days in a year 12 months. Compared with the actual year, it is about 1 1 day, which adds up to three years and 33 days. So there must be a leap month every three years, and there are three or four days left, which adds up to two years. * * * The remaining 25 or 26 days.

2. Leap year in June:

Leap month is a common leap month in China lunar calendar, but its frequency and interval are not fixed, and then with the passage of time, the frequency of leap month will gradually decrease from the highest.

Leap June usually occurs once every 19 years (such as 1960 and 1979), but sometimes it occurs once every 38 years (such as 1835 and 1873), and the interval between leap June and leap June is greater than/.

According to the calculation, the years of Runjun are as follows: 1960, 1979, 1987, 20 17, 2025, 2036, 2055, 2074, 2093, 2/kloc-. 2 16 1，2 169，2 180，2 188，2 199，2207，2245，2256，2275，2283。

Extended data:

Correct calculation of leap month calendar

Leap moon refers to a phenomenon in the lunar calendar. The lunar calendar arranges the big moon and the small moon, that is, the moon, according to the full and short moon. The length of a moon is 29.5306 days, which is the cycle of the moon's profit and loss. According to the lunar calendar, there are 30 days for the big moon and 29 days for the small moon, and a year is 12 months * * 354 days.

The month of the lunar calendar has no seasonal significance, so the year difference between one year and the solar calendar is 1 1 day. It only takes 17 years for the lunar calendar date to be upside down with the seasons.

For example, one year's New Year was spent in the snow, 17 years later, it will be a New Year's Eve. The use of such a calendar naturally cannot meet the needs of agricultural production, so the lunar calendar in China has been in parallel with the 24 solar terms since the Qin and Han Dynasties, and the 24 solar terms are used to guide agricultural production.

Twenty-four solar terms can be divided into two groups: "solar terms" and "middle qi": the ancients regarded every 30 degrees from the slight cold as a solar term; Starting from the winter solstice, the meridian of the Yellow River is a neutral gas every 30 degrees, with 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.

Solar term is the starting point of solar term month; Zhongqi is the midpoint of the festival. The traditional calendar in China does not adopt the method of day-to-day and month-to-month sequence and long-term arrangement of big month, small month, normal year and leap year, but emphasizes the calculation from year to month. The state sets up special institutions to calculate calendars.

First, set the date order according to 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 between this new moon and the next one is 30 days, then this month is the big moon; If it is only once every 29 days, it is an abortion.

Second, set the order of the month and be neutral. First of all, the calendar month and leap month are distinguished by whether the calendar month is neutral or not. We know that there are 12 neutral gases in a tropical year, but it contains 365.2422 ÷ 29.5306 =12.3682 lunar months. After several calendar months of rotation, there must be a calendar month without neutral gas. This month without neutrality is a leap month.

When the previous calendar day is a few months, it is a leap month. For example, the leap month in 1984 appears after October of the old calendar, so it is called "leap October". Leap months are calculated, not fixed in the monthly order of the year. In addition to 1 1 month,1February and the first lunar month, leap month is possible, and it is the seventh leap month in the nineteenth year.

To sum up, leap year is a phenomenon in the solar calendar, which is fixed in February, 29 days longer than the normal year; Leap month is a phenomenon in the lunar calendar. There is a leap month, and the lunar calendar of that year has 13 months, which is called leap month year. A leap month has 384 days.

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