Related terms:
shen
kaifeng
shen kuo
clepsydra
zhang heng
yang xiong
escapement
equinoctial
declination
clock tower
astronomy
lunar eclipse
han dynasty
caves books ltd
celestial globe
solar eclipse
celestial sphere
astronomical
century bc
astronomical clock
Wikipedia sources:
Armillary sphere
Flag of Portugal
Sundial
Hipparchus
Water clock
11th century
Han Dynasty
List of Chinese inventions
History of science and technology in China
Context for words:
armillary
sphere
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