In honor of Zhang's achievements in science and technology, his Mate Cui Ziyu (Cui Yuan) wrote a memorial inscription on his burial stele, which has been preserved from the Guwen yuan.[8] Cui mentioned, "[Zhang Heng's] mathematical computations exhausted (the riddles of) the heavens plus the earth. His inventions ended up https://wm55vip32087.blogthisbiz.com/38166907/about-heng365