Related terms:
kepler
prograde
saturn
galileo
sphere
ptolemy
planets
parallax
copernicus
axial tilt
geocentric
aristarchus
retrograde
celestial
pythagoreans
astronomy
planetary
heliocentric
inclination
revolutionibus
astronomers
ptolemaic system
solar system
geocentric model
celestial bodies
observations
astronomical
nicolaus copernicus
inferior conjunction
center of the universe
Wikipedia sources:
Moons of Saturn
Geocentric model
Retrograde motion
Heliocentrism
Mercury (planet)
Nicolaus Copernicus
Conjunction (astronomy and astrology)
Context for words:
retrograde
motion
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