Is it possible to make a leap in the first month?

There will be the first month, but it will take a long time. According to professional calculations, the next January will not appear until 2262.

The appearance of leap month is related to solar terms. The calculation of lunar calendar in ancient times is different from that of solar calendar today. The number of days in the lunar year will be 10 days less than the sun, which is easy to confuse solar terms, so the ancients invented leap month to maintain the stability of solar terms.

As for which level to pass first, there is no clear stipulation. Usually the first one. Like Runyue before, if there is a festival, it is the first one.

Extended data:

The mid-year month of the lunar calendar is based on the length of 29.5306 days in the first lunar month, so the big month is 30 days and the small month is 29 days. In order to ensure that the first day of each month (the first day) must be a new moon, the arrangement of large and small months is not fixed and needs to be determined through strict observation and calculation. Therefore, it is very common to be big or small for two consecutive months in the lunar calendar, and even there are rare exceptions, such as 1990 in which March and April are small, and 9, 10,1,1February are big for four consecutive months.

So how often do you add leap months? The best way is to find the least common multiple of the number of days in the tropical year and the number of days in the lunar month: we hope that the number of days in m tropical years is equal to the number of days in n lunar months, that is, there should be an equation: m×365.2422= n×29.5306?

In this equation, we can't directly find out m and n, but we can find out their proportions:

The approximate value of this ratio is: in these fractions, the numerator represents the number of tropical years and the denominator represents the number of moons.

For example, the sixth score means that seven leap months must be added to 19 tropical year. 19 tropical year plus 7 leap months: 19 tropical year =19× 365.2422 = 6939.6438+08 (days).

A lunar month has 29.5306 days, 235 months = 235× 29.5306 = 6939.338+00 (days).

19 tropic year plus 7 leap months, the contradiction was eliminated:

6939.6910-6939.6438+08 = 0.0892 (days)-that is, more than 2 hours and 9 minutes, which is accurate enough.

Therefore, the lunar calendar adopts the method of 19 plus 7 leap months, that is, the "19 7 leap month method", which well coordinates the return year and the lunar year, so that the New Year's Day (Spring Festival) of the lunar calendar is always kept in the late winter and early spring.

The ancients called 235 new moons "leap weeks". The method of placing leap in the lunar calendar can make the average length of the lunar year close to the tropic year. The moon in the lunar calendar has distinct moon phase characteristics, which keeps the best characteristics of both the solar calendar and the lunar calendar.

Baidu encyclopedia-leap month