/kloc-At the beginning of the 7th century, the British mathematician Napier invented a calculation method, which was introduced to China in the late Ming Dynasty, also known as "calculation". Mei Wending and Dai Zhen, famous mathematicians in Qing Dynasty, studied this. Dai Zhen called it "strategic calculation". Wang also devoted himself to studying this calculation method introduced to China from the west, and wrote three volumes to introduce the western calculation method to Chinese people. In her book, she supplemented and explained the western calculation methods to make them simple and clear. Napier's multiplication and division method introduced by Wang was easier for readers to understand at that time, but it was more complicated than China's multiplication and division method at that time. Therefore, mathematicians have been using China's calculation method instead of Western calculation. Today's readers regard the calculation methods, multiplication and division at home and abroad as antiques, and adopt the four written operations imported from abroad. This kind of written calculation began to be used in 1903, so the history of using written calculation in China is only 100. Wang did a lot of scientific work in her short life at the age of 29. She is proficient in geography, mathematics, medicine, poetry and painting, as well as meteorology. She is really a versatile and talented young female scientist. Her articles "are all based on facts, convincing people by reasoning and not picking weeds." Of course, Wang's greatest achievement is astronomy. She has written many books about her achievements in astronomy, many of which have been forgotten. What she can see now is only the astronomical calendar experience of volumes 5, 6 and 7 of the Jinling series "De Feng Ge Ji". For example, in the fifth volume, there is a debate about precession, a debate about surplus and contraction, a debate about stars, and Huang Chi's second explanation. The sixth volume includes the theory of the circle of the earth, the theory that the earth is more important than nine days, the theory that the annual rings are set at the center of the earth, and the theory that the five stars of the sun, the moon and the sky turn left with the first, second and third days. Volume 7 includes Eclipse solution and Pythagorean triangle solution. It is said that her works amount to 64 volumes, but now we can only read a few volumes. Wang is well-read and persevering. She carefully understands the astronomical data in ancient books and absorbs nutrition. At that time, some almanac said that the difference between the sidereal year and the tropic year began when Emperor Wu of the Han Dynasty changed the calendar. Wang pointed out that this difference did not originate from the calendar, but only appeared after the discovery of precession in Jin Dynasty. The almanac also said that due to precession, the vernal equinox gradually moved eastward. Wang also pointed out that this is wrong. The vernal equinox caused by precession is westward rather than eastward.