Is the lunar or solar calendar accurate?

Strictly speaking, it should be the solar calendar. Basically, the Gregorian calendar is 365 days a year, except that the calendar year is 1 day. Lunar calendar is different. In order to synchronize with the solar calendar, he sometimes adds an extra month in a year. (called Runyue) The older generation is used to the lunar calendar, which has been passed down to this day. Now, according to everyone's habits, you can use whatever you like. All steps of the government, including calculating the length of service, are calculated according to the solar calendar.

lunisolar calendar

Because the new moon is easier to observe than the tropic of cancer, almost all ancient calendars are lunar calendars. Because the earth's orbit around the sun is 365 days, and the lunar December is only about 354 days, the ancients solved this problem by adding leap months. The calendar of our country has been a kind of yin-yang calendar since ancient times. Because the first day of each month is a new moon and the fifteenth day is a full moon, it is easy to identify and use, so it is usually called the lunar calendar. Until today, due to the change of solar terms in the calendar, it is closely related to agricultural planting activities, and the "Lunar Calendar" plays an important role in the lives of China people, especially farmers.

The real lunar calendar is the Islamic calendar. That is, twelve lunar months are a year, regardless of seasonal changes. The lunar calendar is mainly used to guide their religious festivals, so Muslims fast sometimes in summer and sometimes in winter. However, Islamic countries have established another solar calendar to guide secular life.

Therefore, the traditional calendar in our country should not be called lunar calendar strictly, but yin and yang calendar. Now it is called "Lunar Calendar", which is the result of the so-called "four old" during the Cultural Revolution. In fact, this name is also very inappropriate. Its seasonal date can wander for as long as a month, which is not very suitable for agricultural production. To be exact, it should be called "Han Li". (This title is based on the rules of the Han Calendar proposed by Emperor Wu of the Han Dynasty and the title of this calendar in the Imperial System of Emperor Kangxi of the Qing Dynasty. This calendar has been called the "Han Calendar" since ancient times. )

The "Han Calendar" adopts the method of setting leap month and 24 solar terms, so that the average length of the calendar year is equal to the tropic year, so there is an element of the solar calendar. From this perspective, the Han calendar has its advantages. It is one of the scientific astronomical calendars in the world, which well coordinates the cycles of the sun and the moon and realizes the integration of yin and yang.