Is Li the prime minister?

Li was not the prime minister of the Tang Dynasty, but an outstanding astronomer and mathematician. Li (602-670), aged 68, was an outstanding astronomer, mathematician and Taoist scholar in the Tang Dynasty. He was born in Zhou Qiyong county (now Qishan county, Shaanxi province) and is proficient in astronomy, calendar and yin-yang theory. The TuiBei Map written by Li and Yuan Tiangang is famous for its accurate prediction. Li is the first person in wind classification in the world. Li has been smart and studious since childhood, reading widely, especially proficient in astronomy, calendar and mathematics.