Related articles:
Celestial sphere
Ptolemy
Astrolabe
Circle of latitude
Orrery
Flag of Portugal
Escapement
Planetarium
Hipparchus
China
Antikythera mechanism
Song Dynasty
Eratosthenes
Gnomon
Key terms:
globe
rings
pole
circle
celestial
armillary sphere
axis
meridian
clock
fixed
ecliptic
astronomical
horizon
degrees
instruments
astronomy
shen
brass
winch
equator
esfera
seamless
latitude
zhang
observe
equinoctial
celestial globe
south pole
sighting
clepsydra
given day
capricorn
escapement
goes round
century bc
celestial meridian
clock tower
hellenistic
han dynasty
declination
right ascension
north and south
astronomical clock
spherical astrolabe
globe be turned
celestial sphere
astronomical instruments
horizon and meridian
use of the armillary
circles of the heavens
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