Xu Heng, whose real name is Zhong Ping, is called Mr. Lu Zhai by scholars. Born in the third day of April in the first year of Da 'an in Jin Dynasty (two years and four years in Jiading, Song Ningzong), he died in the third day of March in the eighteenth year of Yuan Dynasty (65438 in the first year of the Reform Movement of 1898). Born in Hanoi, Huaizhou (now Qinyang City, Henan Province), his name is Wei. He was an outstanding thinker, educator and astronomer jurist in China in the 3rd century.