Located at No. 17 Nandan Road, Xuhui District, Shanghai (Guangqi Park). In order to commemorate Xu Guangqi, a famous scientist of the Ming Dynasty, and to make his literary and historical status and modern scientific thought have a place of "foothold", Guangqi Park was rebuilt as Xu Guangqi Memorial Hall in early 2005, and became one of the most historic bases of popular science education in Shanghai. Another story is told in the picture of Xu Guang's astronomical instruments. In the late Ming Dynasty, "Datong calendar" was not corrected for a long time, which resulted in great errors, and the prediction of solar and lunar eclipses was always inaccurate. Xu Guangqi, who was seventy years old at this time, was still personally guided and observed by Emperor Chongzhen. In 1633, Xu Guangqi was not in danger. By this time, most of the "Chongzhen Calendar" had been approved. The compilation of Chongzhen Calendar has laid the foundation for astronomical legislation in China in the past 300 years and has epoch-making significance.