Which institution was in charge of astronomy during Zhu Yuanzhang's reign?

During the period of Zhu Yuanzhang, Qěn tiān jiàn was in charge of astronomy (pronounced Q and N tiāN JiàN).

Official signature. Observe astronomical phenomena, calculate solar terms and make calendars. From the Qin and Han Dynasties to the Southern Dynasties, the Emperor Tai Shang belonged to the Taishiling Star Calendar. Sui secretary provincial Taishi Cao, Yang-ti changed Cao to supervisor. At the beginning of the Tang Dynasty, Taishi supervisor was changed to Taishi Bureau, and the successor was renamed Secretary Pavilion, Mixed Day Supervisor, Mixed Justice Supervisor, or Secretary Province several times. In the 14th year of Kaiyuan (726), it was re-established as Taishi Bureau and was the secretary province. In the first year of Gan Yuan (758), it was renamed Si Tiantai. In the Five Dynasties and the Early Song Dynasty, it was called Division, and Yuanfeng was changed to Taishi Bureau after restructuring. There is a supervisor in southern Liaoning, and the gold is called Tiantai, which belongs to the supervisor. In the Yuan Dynasty, there was imperial academy, which was juxtaposed with Si Tianjian and Hui Sijian.

Established in the early Ming Dynasty, it was renamed Qin, with officials such as supervisor and deputy supervisor, and western missionaries participated in the work at the end of the year. In the Qing Dynasty, the management supervisor was a senior official, and the supervisor and deputy supervisor were both from China and Manchu, with the participation of western missionaries. At the beginning of Qianlong, the deputy supervisors were divided into Manchu, Chinese and Western. After that, Huaxi people either returned or died, and no outsiders were needed to enter the official.