Related terms:
kepler
heavens
ptolemy
sidereal
heraclides
parallax
planets
geocentric
aristarchus
planetary
heliocentric
astronomy
celestial
archimedes
babylonian
planetary model
tychonic system
geocentric model
astronomical
observations
heliocentric theory
history of astronomy
ancient greek
laws of planetary motion
astronomical observations
Wikipedia sources:
Heliocentrism
Tycho Brahe
Universe
Aristarchus of Samos
History of astronomy
Context for words:
heliocentric
model
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