崇祯二年(1629年),由徐光启主持的历局正式开始了酝酿已久的参照西方天文学改革历法的活动。这是明末西方天文学东渐过程的高潮,其直接成果是在中国历史上首次有系统地引进了大量的西方天文学知识,完成了《崇祯历书》这样一部大型天文学百科全书的编纂。崇祯七年十二月初三,继徐光启之后主持历局工作的李天经向皇帝进献了徐光启生前所规划的最后一批历书,徐氏计划中 Chongzhen two years (1629), led by Xu Guangqi calendar officially began a long-awaited reference to Western astronomy reform calendar activities. This was the culmination of the gradual process of western astronomy in the late Ming Dynasty. The direct result of this was the first systematic introduction of a large amount of knowledge of western astronomy in Chinese history and the compilation of a large astronomical encyclopedia “Chongzhen calendar.” Chongzhen seven years in early December, following the Xu Guangqi presided over the work of the calendar Li Tianying introduced to the emperor Xu Guang’s last batch of planning before the calendar, Tsui plans