What did Zhuan Xu invent?

Zhuan Xu invented the Zhuan Xu calendar. Zhuan Xu calendar, also known as Qin calendar, is one of the six ancient calendars in China. According to legend, the "Zhuan Xu Calendar" was made over the weekend and promulgated nationwide after the unification of the Qin Dynasty, with 10/day as the first month of the lunar calendar. From the 26th year of Qin Shihuang to the first year of Emperor Wu of Han Dynasty, I traveled 1 17 years. It is said that in the 19th year of the calendar, the seven-leap method is adopted, the tropic year is 365 and 1/4, and the first month of the lunar calendar is 29 and 499/940, with October as the beginning of the year and September as the leap month, which is called the last September.

Zhuan Xu Calendar has two characteristics: First, the Qin regime was still isolated in Yongzhou at that time, and did not associate with vassal states. The princes were arrogant and regarded Qin as a country, so the calendar they implemented was not implemented until Qin unified the world. However, Zhuan Xu Calendar was regarded as the "orthodoxy" of the calendar by the Han Dynasty.

Second, the ancient theory of four seasons calendar is very mature. The so-called Zhuan Xu calendar is just a poor monthly calendar, but the calendar is still drawn up by a "master" who went down the mountain with the method of ancient four seasons calendar. The Zhuan Xu calendar is just a branch of the ancient seasonal calendar or lunar calendar. Regarding the "orthodoxy" in the relationship between the two calendars, it is really necessary to use the historical view to "deny the negation".

Value of Zhuan Xu Calendar: This is the first calendar accurate to every day. In the application process of Zhuan Xu Calendar, its branches and branches are expanding day by day, and the 24 solar terms are creatively included, so that readers can see the daily branches, leap month, the size of the month, the sun and moon of the month, the 24 solar terms of a year and so on. It is clear at a glance, and readers can find the information they need simply, quickly and accurately through this book without complexity.