《明史·志·卷七》
笫二年冬十月，徐光启因病辞去了历局的职务，用山东参政李天经代替他。
明年冬十月，光启以病辞历务，以山东参政李天经代之。
In the tenth month of winter the following year, Xu Guangqi resigned from his post in the Calendar Bureau due to illness and was replaced by Li Tianjing, the Shandong Censor.