Related terms:
mbta
su song
shen kuo
waltham
pasteur
clepsydra
xiangyang
trebuchet
hipparchus
zhang heng
escapement
gunpowder
catapult
ecliptic
astronomical clock
armillary sphere
clock tower
ptolemy
massachusetts route
middlesex county
isaac newton
han dynasty
babylonian
tang dynasty
astronomy
invented
astronomical
century bc
cambridge university press
siege
Wikipedia sources:
Song Dynasty
Compass
Newton, Massachusetts
Internet Movie Database
Greater Boston
Trebuchet
History of science
History of cartography
Wheelbarrow
Biogenesis
Siege
Water clock
Armillary sphere
History of trigonometry
Hand grenade
Context for words:
needham
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