Li Chunfeng

Li Chunfeng ( 602 * in Baoji, † 670 in Chang'an ) was a Chinese mathematician, astronomer, and historian.

Li Chunfeng was the son of a Taoist learned state officials. He was appointed court astronomer and historian 627 into the Imperial Office for Astronomy, whose Deputy Director he whose director he was 641 and 648. There he was responsible for a calendar reform ( Linde calendar), which was 665 performed ( with months of 29 and 30 days and a leap month every three years). The calendar was in use until 728. He also improved the instruments at the Imperial Observatory.

He is best known as the editor ( by order of the emperor Li Yuan ) of the Ten Mathematical Classics ( Suanjing shi shu ), which he also commented adjusted and errors.

As a historian, he was involved in the official history of the Sui Dynasty and Jin Dynasty. He wrote a book on Taoist practices ( "Commentary and Introduction to Gold Locke and the flowing beads " ) and astrology ( Yisizhan, 645 ). A book about prophecies with number games ( numerology ) is attributed to him.