Related terms:
armillary sphere
yang xiong
joseph needham
mawangdui
denis twitchett and michael loewe
seismometer
zhongshu
ch'in and han empires
chinese astronomers
shen kuo
armillary
Wikipedia sources:
Zhang Heng
Science and technology of the Han Dynasty
History of science
Chinese astronomy
List of Chinese inventions
2nd century
Society and culture of the Han Dynasty
History of science and technology in China
Odometer
Han Dynasty
125
History of geometry
Yi Xing
Context for words:
zhang
heng
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