What did Tang Ruowang do in China?

Tang Ruowang is an important figure in the history of cultural exchange between China and the West, Christianity in China and science and technology in China. With his devout faith, profound knowledge and outstanding talent, he established his important position in the history of cultural exchange between China and the West. He has been in China for more than 40 years, experienced the Ming and Qing Dynasties, and is one of the most important Jesuits since Matteo Ricci came to China. He inherited Li Yike's strategy of missionary work, and made many contributions to the revision of the calendar and the manufacture of artillery in Ming and Qing Dynasties. Today's lunar calendar in China is a "modern lunar calendar" modified by Tang Ruowang on the basis of the earliest lunar calendar used in the Ming Dynasty.

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