Reason: Tang Ruowang invented the present lunar calendar.
In China, Indian astronomy was introduced to China in the Tang Dynasty, and Arabic astronomy was introduced to China in the Yuan and Ming Dynasties. However, China has never adopted the nine calendars of the Tang Dynasty, the perpetual calendar of the Yuan Dynasty and the Hui Hui calendar of the Ming Dynasty. It was not until the constitutional calendar of the early Qing Dynasty that some methods and calculation data of European astronomy were used. However, the styles of China's traditional calendars have not changed, but combined with each other. This is a great reform in the legal history of China.
After the Qing Dynasty made Beijing its capital, it was well aware of the advantages of the new calendar in the late Ming Dynasty, so it ordered Tang Ruowang and others to copy the percentage of the new calendar and rename it Shi Xian Li. In Shi xian Li, he learned about the elliptical orbit and the revolution speed of the sun and the moon in different positions, and began to remember the calendar with constant gas. These are two important changes. It is 97 years from the second year of Shunzhi (1645) to the sixth year of Qianlong (174 1). In the 23rd year of Kangxi (1684), Li Xiang's examination was compiled on the basis of Jiazi in this year, so it is also called Jiazi Yuanli. The chronological data it uses is the data translated by Tycho according to Li Xiang Kao Cheng. In the eighth year of Yongzheng (1730), there was a solar eclipse in June, and the solar calendar of Jiazi was one point short. So ignaz kogler and others revised the solar eclipse in the calendar exam and used it to calculate the solar eclipse. In the seventh year of Qianlong (1742), they rebuilt the current constitutional calendar and compiled the Postscript of Calendar Images, which took Guimao (1723) in the first year of Yongzheng as the yuan, and called Guimao Yuan Calendar. The year changed by Newton was adopted and promulgated from the 7th year of Qianlong to the Qing Dynasty (19 1668). Now, the basic method of making old calendars, or summer calendars or lunar calendars is the old Guimao Yuan calendar, which can be traced back to the constitutional calendar and revised by Tang Ruowang and others. Only the data is more accurate, and it is more reasonable to set up leap and other methods.