《明史·志·卷一》
因此钦天监建立运仪，矫正方案、悬晷、偏晷、盘晷各种样式的仪器在观象台都已具备，全部按照元朝的制度来决断。
由是钦天监之立运仪、正方案、悬晷、偏晷、盘晷诸式具备于观象台，一以元法为断。
Therefore, the Qin Tian Jian built the Yunyi, and corrected the instruments of various types such as the plan, hanging sundial, partial sundial, and pan sundial in the observatory. All of them were decided according to the system of the Yuan Dynasty.