Which Han emperor owned the first month of the year?

It was put forward by Emperor Wu of the Han Dynasty.

In the seventh year of Emperor Wu of the Han Dynasty, a surname ordered Sima Qian to write to Sun Qing and Hu Sui, doctors of traditional Chinese medicine, saying, "It's useless to learn from bad experiences, but it's better to change them into new ones". After consulting Dr. Er Kuanhe, Emperor Wu of the Han Dynasty ordered Sima Qian and others to "discuss the opening of the Han calendar". Recruit famous astronomers from all over the country to participate, not only cooperate with each other, but also give full play to their expertise, and * * * has formulated more than ten calendars.

Taichu calendar reverted from October in winter to the first month of the summer calendar, and absorbed the 24 solar terms of the dry calendar as an auxiliary calendar to guide farming, and took the month without neutral atmosphere as a leap month, making the calendar more suitable for farming. Taichu calendar was officially opened in 104 BC, 58 years earlier than julian calendar in ancient Rome. Taichu calendar used it for 188 years.

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Taichu calendar is the first relatively complete calendar in ancient China, and the formulation of this calendar is also a major calendar reform in the calendar history of our country. The ancient calendars before the Han Dynasty included Huangdi, Zhuan Xu, Xia, Yin, Zhou and Lu. The remaining years of the six ancient calendars are all a quarter of a day, so they are called seasonal calendars. Taichu calendar divides a day into eighty-one, so it is also called "eighty-one calendar".