In honor of Zhang's achievements in science and technological innovation, his Buddy Cui Ziyu (Cui Yuan) wrote a memorial inscription on his burial stele, that has been preserved inside the Guwen yuan.[eight] Cui stated, "[Zhang Heng's] mathematical computations fatigued (the riddles of) the heavens along with the earth. His inventions https://heng36555320.blogvivi.com/32228683/heng365-for-dummies