What were the officials who observed astronomical phenomena in ancient times?

In ancient times, the person who observed the celestial phenomena at night was called Qin. Qin is responsible for observing astronomical phenomena and calculating the solar calendar. Since the Qin and Han Dynasties, the astronomical calendar has been ruled by Taishiling. Taishi Bureau was established in the Tang Dynasty, and later changed to Sitiantai, which belongs to the secretary province. During the Song and Yuan Dynasties, there was a heavenly prison, which was in parallel with Taishi Bureau and Taishi Academy. Both the Ming and Qing Dynasties were renamed Qin Tianjian. In the Ming Dynasty, Qin Tian Prison had one supervisor and two deputy supervisors.