According to legend, there was a calendar in the Xia Dynasty more than 4,000 years ago. What calendar is it?

Legend has it that the calendar was founded in Xia Dynasty, and the original calendar rules have been lost. Now we can only learn something from some ancient books. The lunar calendar takes the moon as an example, which is the basis for determining the lunar month. A month is called "lunar month". The first day of each month is the lunar calendar and the fifteenth day is the lunar calendar. Besides reflecting the phases of the moon, the lunar calendar also reflects the tides. It is said that China had a calendar in the Xia Dynasty more than 4,000 years ago. Today's lunar calendar, also called "Li Xia", is said to have originated in the Xia Dynasty. By the Shang Dynasty, the calendar was gradually complete, with a year divided into 12 months, a big month of 30 days, a small month of 29 days, and an increase of one month in leap years.

It is said that there was a calendar in the Xia Dynasty more than 4,000 years ago, so people called the traditional calendar in ancient China the Xia calendar. The Xia Dynasty was the beginning of slavery, and the production tools were improved. Using wooden plows and plows, harvesting crops with stone knives and mussels, the original irrigation technology was developed. The lunar calendar is based on the lunar cycle, also known as the lunar calendar. Because the changes in the calendar are mainly solar terms and agricultural arrangements, it is also called the lunar calendar.

The traditional chronology of branches and branches in China originated very early. At the end of Xia Dynasty, emperors such as Kong Jia, Yin Jia and Lu Guo (Jie) all took Tiangan as their name, indicating that Tiangan was very common at that time. Dai Xia Zheng Xiao is an important extant document. It describes the astrology, weather, phenology, agriculture and political affairs of each month according to the order of December in the lunar calendar. To some extent, it reflects the development level of agricultural production in Xia Dynasty and preserves the oldest and most precious scientific knowledge in China.

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