What influence does Chongzhen almanac have on future generations?

China's almanac of Chongzhen is the first large-scale academic work that absorbed advanced western astronomical knowledge to reform the traditional calendar of China. It introduced the knowledge of western astronomy in a comprehensive and systematic way, which impacted the relatively backward traditional astronomy in China, made the development of astronomy in China embark on a new road of absorbing and integrating western astronomy, and played a very important role in promoting the development of astronomy in China to a modern mode. The cosmological systems of Ptolemy and Tycho in the West are introduced in detail in the Calendar of Chongzhen. Although Copernicus' Heliocentrism system has also been mentioned, people think that only Tycho's system is correct. This is a compromise theory of Copernicus, Heliocentrism and Ptolemy's geocentric theory. Although it still thinks that the earth is the center of the universe, and the sun and stars revolve around the earth, it thinks that the five planets revolve around the sun, which is relatively progressive than the traditional geocentric system of China or the Ptolemaic geocentric system that has been circulated in China at that time. The astronomical table in the almanac of Chongzhen was compiled on the basis of Tycho system. It also quoted a large number of Tycho's observation data, and its description of the apparent motion of the sun, the moon and the five planets was solved by a set of small gear trains with even round wheels, which explained the phenomenon that the sun and the moon were sick in the late stage and five stars stayed together. Geometry is used in the calculation, which makes the China calendar close to the western classical geometry system from the traditional algebraic system. It also introduced the clear concepts of the earth and related geographical latitude and longitude for the first time in Chinese history, which made the calculation of solar eclipse and lunar eclipse a big step forward. In the calculation method, spherics and plane trigonometry, which were mature in the west at that time, were introduced. There are about 20 volumes of western mathematical works, such as Spherical Triangle, Plane Triangle, Western Calculation and Proportional Gauge, which constitute the legal calculation part. This provides a reliable guarantee for the accurate calculation of the calendar.