Which period of the Han Dynasty was headed by the first month?

During the period of Emperor Wu of the Han Dynasty, from the first year of Emperor Wu's reign, the first day of the first month of the first lunar month in the summer year was regarded as "Year" (that is, "Year"), and the annual festival date was fixed and continued to this day. The Han Dynasty (202 BC-8 AD, 25 -220 AD) was a unified dynasty after the Qin Dynasty, which was divided into the Western Han Dynasty and the Eastern Han Dynasty. There are 24 recognized emperors who have enjoyed the country for 407 years.

Which period of the Han Dynasty was headed by the first month? In the history of China, the first month was officially established as the period of Emperor Wu of Han Dynasty. In the first year of the Western Han Dynasty (BC 104), Emperor Wu of the Han Dynasty accepted the suggestions of Sima Qian and others, adopted the taichu calendar, restored the summer calendar, that is, the lunar calendar, and put the 24 solar terms into the calendar with the first month as a year.

During the period of Emperor Wu of the Han Dynasty, the country gradually became rich and strong. Emperor Wu of the Han Dynasty was full of high spirits and lofty sentiments. He decided to change the calendar to suit his color. BC 104, he promulgated a new calendar, taichu calendar, and once again set January as the beginning of the year. Restored the summer calendar, that is, the lunar calendar, with the first month as the beginning of the year, and set the 24 solar terms into the calendar. Since the first year of Emperor Taizu of the Han Dynasty, the first day of the first month of the Xia Dynasty (lunar calendar) has been regarded as "Year", and the date of the annual festival has been fixed and continues to this day.

Emperor Wu of the Han Dynasty was the first emperor to formulate and promulgate the taichu calendar Law in a unified way throughout the country, and it was used from the first month of each year. Before the early Han Dynasty, China mainly adopted the "Zhuan Xu Calendar" in the "Ancient Six Calendars" (Huangdi, Zhuan Xu, Xia, Yin, Zhou and Lu). In the first year of Taichu (BC 104), taichu calendar was changed, with the first month as the beginning of the year, and the color was still yellow. The formulation of taichu calendar Law is an important calendar reform in the history of China and an immortal contribution of Chinese civilization to world astronomy. The scientific achievement of taichu calendar method lies in the precision and accuracy of calendar calculation.

In the era of Emperor Wu of the Han Dynasty, the unified multi-ethnic country with the Han nationality as the main body was consolidated unprecedentedly, and the mainstream form of Chinese culture was basically formed, which opened the prelude to the prosperity of Chinese civilization. The political system, economic form and cultural pattern in the era of Emperor Wu of the Han Dynasty left a very important historical influence on later generations.