In honor of Zhang's achievements in science and know-how, his Good friend Cui Ziyu (Cui Yuan) wrote a memorial inscription on his burial stele, which has been preserved within the Guwen yuan.[eight] Cui said, "[Zhang Heng's] mathematical computations exhausted (the riddles of) the heavens as well as the earth. His https://jeffreyahmsy.blogkoo.com/the-ultimate-guide-to-heng365-51246378