People call China's ancient traditional calendar the summer calendar. Did it really originate in the Xia Dynasty?

? It is an indisputable fact that the Xia calendar was formulated by the Xia Dynasty, and it is also a recognized fact.

First, the formulation of the summer calendar, which is now the lunar calendar in China. In the long history, the lunar calendar has played an important role in guiding agricultural production. During this period, there was a method of chronology, and each dynasty also recorded the number of years of each emperor's reign, generally using the custom of the lunar calendar. After the founding of the People's Republic of China, the Gregorian calendar was used to record the years in the literature, and the lunar calendar was also used by the people, indicating the importance and continuity of the lunar calendar.

The name of the summer calendar was changed to the lunar calendar, about 3,000 years ago. It is said that the calendar was given to the Yellow Emperor by measuring the sky regularly. It is an indisputable fact that the Xia calendar was formulated by the Xia Dynasty, and it is also a recognized fact. Xia Li is a wonderful flower in the treasure house of Chinese culture. It covers the cultural background of astronomical meteorology in the Xia Dynasty and embodies the wisdom of the ancestors of the Yellow Emperor, which will last forever. Summer people use astronomy to observe the alternation of the sun and the moon, the growth and change of everything, the temperature difference between the earth's cold and warm, and the rotation of day and night.

Especially, according to the laws of sowing, growth, development and maturity of crops closely related to human life, and according to the changes of Yin and Yang of the three planets, the calendar of year, month, day, 24 hours _ day and night, one year 12 months, 24 solar terms, 365 days in spring, summer, autumn and winter, and 3 months in each quarter was compiled.

However, the summer calendar is a typical regional calendar. This is not a universal calendar. It is a calendar based on the meteorological characteristics of regional climate and phenology in the specific geographical location of Xia Dynasty. It doesn't apply to other regions. Later, China's territory expanded, so it was far-fetched to calculate the year, month and day with the Gregorian calendar method. It is difficult for the 24 solar terms to match the distinct climate of summer, spring, summer, autumn and winter.