How is the lunar calendar calculated?
Lunar calendar, the traditional calendar of China. According to the cycle of the moon phase, each moon phase changes to one month; A tropical year is divided into 24 segments, forming 24 solar terms. By referring to the tropic year of the sun, leap months are set to adapt their average calendar year to the tropic year. The lunar calendar combines the lunar calendar with the solar calendar to form a method of combining yin and yang.
The lunar calendar is also called summer calendar, lunar calendar, old calendar, middle calendar and lunar calendar. Because of the use of Xia Zheng, it was often called Li Xia in the old society. After 1970, Li Xia was renamed as Lunar Calendar. The lunar calendar is a combination of yin and yang, and the years are divided into flat years and leap years. An average year is twelve months; A leap year is thirteen months. A month is divided into a big month and a small month, with 30 days in the big month and 29 days in the small month, and its average calendar month is equal to the full moon.
Second, the solar calendar
The solar calendar, also known as the solar calendar, is a calendar based on the movement cycle of the earth around the sun.
The Gregorian calendar year is approximately equal to the tropic year, one year 12 months. This "month" has nothing to do with the first lunar month.
The month and date of the solar calendar are very consistent with the position of the sun on the ecliptic. According to the date of the solar calendar, we can clearly see the changes of cold and warm seasons in a year. But every month, you can't see the new moon, the new moon, the new moon.
At present, the Gregorian calendar, which is commonly used in the world, is a solar calendar, with 365 days in a normal year and 366 days in a leap year, once every four years, once in a hundred years and once again in the 400th year, that is, there are 97 leap years every 400 years. The average length of the Gregorian calendar is only 26 seconds away from the tropic year, and it takes only one day to accumulate 3300 years.
Third, the lunar calendar
The lunar calendar is one of the traditional calendars in China, also known as the old calendar, the Han calendar and the ancient calendar. After the Revolution of 1911, it was changed to the western solar calendar (Gregorian calendar), and the modern lunar calendar belongs to the combination of yin and yang.
In China's traditional calendar, the lunar calendar mainly refers to the calendar arranged according to the periodic changes of the moon phases, that is, the calendar with the first month of the lunar calendar as the basis for determining the calendar months and twelve calendar months in a year. During the development and evolution of the calendar, it combined with the 24 solar terms in the trunk calendar to form the lunar calendar (Han calendar), which was used to guide agricultural production scientifically. Although the lunar calendar and lunar calendar are commonly known as ancient calendar, Han calendar and old calendar, there are differences between lunar calendar and lunar calendar (Han calendar). The traditional lunar calendar (Han calendar) is actually a combination of yin and yang, not a traditional lunar calendar.
The lunar calendar determines the moon on the basis of its motion law: the orbit of the moon is called the white road, and both the white road and the ecliptic road are two great circles on the celestial body, which intersect at five degrees and nine minutes. The moon goes around the earth once and appears on the ecliptic twice, lasting 7 hours and 43 minutes 1 1.5 seconds (27.32 days), which is called the "sidereal moon". Only when the moon revolves around the earth, the position of the earth changes because of its revolution around the sun. The forward number exceeds 27 degrees, and the moon runs 13 degrees 15 minutes every day, so it takes 29 days 12: 44: 2.8 (29.53 days) for the moon to return to the moon, which is called "the first month" and is called the month by custom.