The ancient book of astronomy and calendars, "Calculating the seven political intercourse eclipse lingering law" PDF eBook download. （
Introduction
China is one of the earliest and fastest growing countries in the world in terms of astronomy, and astronomy is one of the four most developed natural sciences in ancient China, the others include agriculture, medicine, and mathematics. In the history of the development of astronomy, all of them occupy an important position. In ancient China, a full-time astronomical official was set up, specializing in "observing the elephant and giving the time".
The ancient Chinese calendar includes not only the calculation of festivals, the distribution of the number of days in each month, the arrangement of months and intercalary months, but also many astronomical aspects, such as the calculation and prediction of the moment of occurrence and visibility of solar and lunar eclipses, the calculation and prediction of the positions of the five major planets, etc. On the one hand, it shows the importance of astronomy and astronomical phenomena in ancient China, and at the same time, such astronomical phenomena were also one of the important means used to verify the accuracy of the calendar. And it is remarkable that Guo Shoujing was able to measure so precisely six or seven hundred years ago
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