Comprehensive analysis of China lunar calendar

The Lunar Calendar (nóng lì) is a traditional calendar in China, and it also has the names of trunk calendar, Chinese calendar, summer calendar and Chinese calendar. Lunar calendar is a kind of lunar calendar, which is usually called lunar calendar by mistake. The lunar calendar takes the change cycle of the moon phase, that is, the length of the moon is one month, plus the "24 solar terms" of the elephant calendar, and takes the length of the tropical year of the sun as the year. By setting leap months, the average calendar year adapts to the tropic year. Lunar calendar is a calendar based on China calendar (lunar calendar) and integrated with solar calendar. So strictly speaking, the lunar calendar in China should not be called the lunar calendar, but the lunar calendar.

The lunar calendar belongs to a kind of lunar calendar: its 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. Calendar is a rule to measure a long time interval, judge climate change and predict the arrival of seasons according to the natural laws of astronomical changes. According to the calendar year and month, it is divided into solar calendar, lunar calendar and yin-yang calendar. There are three kinds of calendars: lunar calendar, solar calendar and yin-yang calendar. In the lunar calendar, its basic calendar rules have been gradually improved and formed by generations, and its form has continued to this day.

The calendar with the plastic moon as the basic unit is the lunar calendar, and the calendar with the solar year as the basic unit is the solar calendar. Lunar calendar is a kind of calendar formed by integrating solar calendar elements on the basis of summer calendar (lunar calendar). The lunar calendar is based on the lunar calendar (summer calendar) and the solar calendar, combining yin and yang. Taking the change period of the moon phase as the length of the month, plus the "24 solar terms" component of the dry calendar, and referring to the length of the tropical year of the sun as the year, the average calendar year is adapted to the tropical year by setting leap months. Therefore, the lunar calendar has both lunar and solar elements.

Unlike the Gregorian calendar, which is fixed at 365 days or 366 days, the Gregorian calendar sometimes differs from the Gregorian calendar by one month. In order to coordinate the number of days between the tropic year and the first month of the lunar calendar, the lunar calendar came into being. The method is to add 24 solar terms and "19 7 leap year" to the calendar (that is, add 7 leap years to 19 lunar year). There is one more leap month in the leap year of the lunar calendar, so there are 383.8978 days in a year on average, while there are 354.3672 days in the normal year of the lunar calendar. ) make the average number of days in a year consistent with the number of days in the Tropic of Cancer. Therefore, this calendar conforms to both the moon and the periodic movement of the earth around the sun.

The "leap year method" sets 7 leap months every 19, and the year with leap months has an average of 383.8978 days, which is called leap year. The leap rule takes the winter solstice as the calculation starting point, from the calendar month of winter solstice in A year to the calendar month of winter solstice in B year (excluding). If there are only twelve moons, it is set as a normal year and there is no leap year. If there are thirteen new months, the first calendar month without neutral gas will be set as leap month, which is called leap month, counting from the calendar month in which the winter solstice of the first year is located.