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刘焯,字士元,信都昌亭(河北省冀州市)人,出生于公元544年,逝世于610年,隋朝经学家、天文学家。隋文帝开皇初年,刺史赵炬拜刘焯为员外将军。刘焯的门生弟子很多,成名的也不少,其中衡水县的孔颖达和盖文达,都是他的得意门生,孔、盖后来成为唐初的经学大师。隋炀帝即位时,历法多存谬误,刘焯多次建议修改。公元600年,他呕心沥血,写出了《皇极历》,在历法中首次考虑太阳视差运动的不均匀性,创立用三次差内插法来计算日月视差运动速度,推算出五星位置和日、月食的起运时刻,
Liu Zhuo, Shi Shuyuan, Shidu Changting (Hebei Province Jizhou), was born in 544 AD, died in 610 years, the Sui Dynasty by scholars, astronomers. Sui Wendi Kaihuang early years, provincial governor Zhao Zhuo worship Liu Zhuo general staff. Liu Zhuo's disciple disciples a lot, fame a lot, including Kong Yingda and Gavin Tatsu Hengshui, are his favorite pupil, hole, cover later became the early Tang master of learning. Sui emperor ascended the throne, the calendar there are many fallacies, Liu Zhuo repeatedly suggested changes. In 600 AD, he painstakingly worked hard and wrote the “Huang Dazhui”. For the first time in the calendar, he considered the nonuniformity of the solar parallax movement. He established the cubic difference interpolation method to calculate the parallax movement in the sun and the moon and deduced the five-star position and date , The eclipse of the moment,