In the first year of the Western Han Dynasty, Sima Qian and others suggested that taichu calendar should be used to restore the summer calendar, that is, the lunar calendar, with the first month as the beginning of the year and the 24 solar terms as the lunar calendar. Later, although the calendars were revised, they were basically based on taichu calendar. Taichu calendar reverted from the beginning of October in winter to the beginning of the first month in the summer calendar, and absorbed the 24 solar terms in the dry calendar.
In the early Han Dynasty, it inherited the Qin system and the ancient calendar "Zhuan Xu calendar". However, this astronomical calendar has obvious errors in recording time and has no guiding effect on agriculture. At the suggestion of Sima Qian and others, Emperor Wu of the Han Dynasty found a skillful craftsman who could make astronomical calendars, and spent a lot of time and energy, and finally wrote taichu calendar Law and taichu calendar Law, which were more accurate and advanced than Zhuan Xu Calendar in the Qin Dynasty.
The contribution of Emperor Wu of Han Dynasty:
In the 5th year of Jianyuan (BC 136), Liu Che established the Doctor of Five Classics and reiterated his respect for Confucianism. In the first year of Yuanguang (BC 134), Liu Che was the second scholar, and Tian Fen, the prime minister, admitted hundreds of Confucian scholars. Later, Confucian scholar Gong became prime minister, leading students all over the world to study Confucianism. In the process of respecting Confucius, Liu Che paid the most attention to Gong Sunhong and Dong Zhongshu, and asked Liu Yuxin to learn The Biography of the Spring and Autumn Ram.
Dong Zhongshu put forward that "those who are not in the subject of six arts, but who are skilled by Confucius, should seek their own way, so they don't seek progress", but Liu Che didn't really adopt it. Instead, it adopted the policy of "broadening the road of artistic ability and learning from others", that is, while promoting Confucianism to the official ideology, it also retained the learning of a hundred schools of thought.