What was the name of the official who observed the astronomical phenomena in Han Dynasty?

From the Qin and Han Dynasties to the Southern Dynasties, the Emperor Tai Shang belonged to the Taishiling Star Calendar.

The ancient imperial court in China was an official in charge of ancestral temple etiquette. The real name is Fengchang, and it was renamed Taichang in the sixth year of Emperor Han Jingdi (formerly 144). Some people say that the name in the early years of the Western Han Dynasty was too common, so Hui Di changed it to serve it, and the old name was restored when Emperor Jingdi was in office. Xin Mang changed its name to Naoko. The Eastern Han Dynasty changed its name too frequently. Its main duties are as follows: First, it is in charge of ceremonies such as offering sacrifices to the country, ancestral halls, court meetings and funerals. Serve as the chief priest and the emperor's assistant during the sacrifice. The second is to be in charge of the emperor's mausoleum and its counties. Taichang visits the imperial mausoleum once a month. The reason why the Han Dynasty was the first minister was that the position of honor was too common. In the Western Han Dynasty, Liehou was often appointed as a post. Because officials participate in ancestral temples and ceremonies, those in his position are often criticized. Tai Changcheng has more than a dozen subordinate officials, such as Mao, Tai Zai, Tai Shi, Tai Servant and Tai Yi. Ten subordinate officials were omitted in the Eastern Han Dynasty, and people who were too formal did not have to be liehou. Most of them took this position with the famous Confucianism. In addition, doctors in the Han dynasty were also very common. The examination and recommendation of doctors and doctoral disciples shall be presided over by Taichang. Therefore, Taichang has become an important institution to train and promote officials who are proficient in Confucian classics. From Wei and Jin Dynasties to Ming and Qing Dynasties, Taichang's position was basically the same as that of Han Dynasty. Only the official doctors Le Tai, Tai Shi, Tai Fu and Tai Yi were separated and transferred to other companies. Too often, he became an official in charge of sacrifice and etiquette.

In the Qin Dynasty, it was called Fengchang, and in the sixth year of Emperor Jing of Han Dynasty (144 BC), it was renamed Taichang, in charge of the state of rites and music and the etiquette of ancestral temples. Its officials include Tai Shi, Tai Zhu, Tai Zai, Tai Yao, Tai Yi, Tai Fu Liu Ling and Dr. Jiuji. One of the nine ladies.

TaiChangQing is the doctrine, the rest from the doctrine.

The next one is too evergreen to be in the fourth grade, and the rest of Shao Qing is in the fourth grade.