Is Li Chunfeng the prime minister?

Li Chunfeng was not a prime minister, but an outstanding astronomer and mathematician in the Tang Dynasty. Li Chunfeng (602-670), aged 68, was an outstanding astronomer, mathematician, and Taoist scholar in the Tang Dynasty. He was a native of Yong County, Qizhou (now Qishan County, Shaanxi). He was proficient in astronomy, calendar, and the theory of yin and yang. "Tui Bei Tu" written by Li Chunfeng and Yuan Tiangang is famous for its accurate predictions. Li Chunfeng was the first person in the world to grade wind power. Li Chunfeng was smart and studious since he was a child. He was well-read and especially proficient in astronomy, calendar, mathematics, etc.