In honor of Zhang's achievements in science and technologies, his Close friend Cui Ziyu (Cui Yuan) wrote a memorial inscription on his burial stele, which has been preserved in the Guwen yuan.[8] Cui mentioned, "[Zhang Heng's] mathematical computations exhausted (the riddles of) the heavens and the earth. His innovations were https://heng36576531.blogrenanda.com/37751307/little-known-facts-about-heng365