Zhāng Héng
Zhang Heng (78-139) great Han dynasty astronomer and mathematician
dì dòng yí
the world's first seismograph invented by Zhang Heng 张衡 in 132
abbr. for 候風地動儀|候风地动仪
hòu fēng dì dòng yí
the world's first seismograph invented by Zhang Heng 张衡 in 132
lòu shuǐ zhuàn hún tiān yí
water-driven armillary sphere (Zhang Heng's famous astronomical apparatus)
hún yí zhù
book by Han dynasty astronomer Zhang Heng
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