What was the name of the official in charge of stargazing in ancient times?

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. The Yuan Dynasty also established Huisi Tian Jian Prison. Both the Ming and Qing Dynasties were renamed Qin Tianjian. In the Ming Dynasty, Qin Tian Prison had one supervisor and two deputy supervisors. There is a main book hall, an official in spring, summer, autumn and winter, a five-sense desk, a five-sense seal, a five-sense supervisor, a five-sense calendar, a five-sense secretary, and a missing doctor. The supervisor and deputy supervisor are responsible for observing astronomy, determining the number of calendars, timing and pushing steps respectively. On the winter solstice every year, the next year's big calendar is submitted and transferred to the Ministry of Rites for promulgation. Now we know that Qin in the Ming Dynasty was mainly responsible for printing and producing Da Li Tong Ri, which was performed accurately every year, in addition to carving astronomical blocks. According to North Korea's summary of the literature, "there are two forms of imperial calendars, namely, imperial calendars and folk calendars. Make a grand calendar every year, submit a calendar sample on February 1 day in advance, and then publish 15 copies. The gift department sent it to Beijing and the Chief Secretary for printing as usual. " It seems that in the Ming Dynasty, Qin Tianjian only printed almanac samples every year and submitted them to the Ministry of Rites for promulgation. Therefore, there are only 28 printers, 2 calendar engravers and/kloc-0 back mounting craftsmen in Qin, which is worse than thinking.