Why is there a leap month in the lunar calendar? How did it come about?

Generally, our lunar calendar only has 365 days, but there is one exception, that is, the appearance of the leap month, the number of days in the lunar calendar will increase, but not every year there will be a leap month, only when it arrives Only available in special years.How did Leap February appear in 2023, and what kind of saying does it have.

There will be a leap in February in 2023

Generally speaking, the leap in February in 2023 is to make the lunar and solar seasons of this year coincide, and the seasons can also be consistent.

The emergence of the second month of the leap is because the month after the second month of the lunar calendar only has the solar term "Qingming", and the "Grain Rain" after "Qingming" falls to the next month.A month without a temper.Therefore, the month after February is named "Leap February", which is the reason for leap February.

What are the leap years in the future?

21st century:2042 (Jenxu year), 2099 (Jiwei year);

22nd century:2137 (Dingyou year), 2186 (Bingxu year);

23rd century:2281 (Xinyou year), 2300 (Gengchen year).

How does the leap month come about

There are two kinds of calendars in use in most parts of our country:one is the Gregorian calendar and the other is the lunar calendar (also called the summer calendar).

The Gregorian calendar is also called the solar calendar, which is based on the year of return.Since the length of the tropical year is equal to 365.2422 mean solar days (ie 365 days 5 hours 48 minutes 46 seconds), it is not a number of whole days.Therefore, the Gregorian calendar takes 365 days as a normal year, that is, a "normal year".In order to eliminate the gap between it and the actual year of return, the Gregorian calendar uses the "intercalation" method to add 97 days in 400 years, or add one day to February every four years.This is the leap year in the Gregorian calendar, and it is also the "leap February" in the Gregorian calendar.

The lunar calendar is different.In fact, it is a "yin-yang calendar" in which "the calendar months are the same as the lunar calendar, and the calendar year is similar to the solar calendar".It is based on the cycle of the moon’s waxing and waning profit and loss as the basis of the calendar month, and also considers the year’s cold and summer solar terms.Generally speaking, the moon’s profit and loss cycle is 29.53 days (that is, 29 days, 12 hours, 44 minutes and 2.9 seconds), which is called a "syndromic month".There are 30 days in the big month and 29 days in the small month.In this way, there are 12 months in a year, with a total of 354 days.The months of the lunar calendar have no seasonal meaning.In this way, 12 synodic months constitute a lunar year, with a length of 29.5306×12=354.3672 days, which is 10.88 days less than the tropical year (365.2422 days), and each month is 0.91 days less.There is a difference of 10.875 days between a year and a year in the Gregorian calendar, and it only takes 17 years for the dates in the lunar and solar calendars to be reversed with the seasons.For example, in a certain year, the New Year is spent in the auspicious snow, and 17 years later, the New Year will be celebrated with fans.Using such a calendar naturally cannot meet the needs of agricultural production.Therefore, since the Qin and Han Dynasties, the Chinese lunar calendar has been paralleled with the twenty-four solar terms, and the twenty-four solar terms are used to guide agricultural production.

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