78-139 Chinese Astronomer and Mathematician Zhang Heng was a Chinese mathematician and scientist, born in the first century A.D.In addition to being one of the emperor's astrologers, Heng made a number of interesting astronomical discoveries....

78-139 Chinese mathematician and astronomer who developed the world's first seismoscope, as well as one of the earliest rotating globes. His seismoscope, an ingenious invention that he unveiled in 132, consisted of a cylinder surrounded by...

Zhang Heng (Chinese: 張衡; pinyin: Zhāng Héng; Wade-Giles: Chang Heng) (AD 78–139) was an astronomer, mathematician, inventor, geographer, artist, poet, statesman, and literary scholar of the Eastern Han Dynasty in ancient China. He had...