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Galileo believed in the truth of the copernican theory, which stated that the sun was the center of the universe.
Dorothy Stimson has written: 'The gradual acceptance of the Copernican theory of the universe' -- subject(s): Accessible book, Astronomy, History, Solar system 'The gradual acceptance of the Copernican theory of the universe' -- subject(s): Astronomy, History
A Ptolemaic view of the Universe has the Earth at it's centre. The Copernican centres on the sun. Both however have been found to be incorrect.
A geocentric theory is one that states the universe is centered by Earth. Geo means earth. The old Ptolemaic Model of the universe has earth as the center. A heliocentric theory is one that is centered by a source of heat. Helio = heat. It basically states that the sun is the center of our galaxy. (Copernican Model)
The Ptolemaic theory (geocentric) put forth by Claudius Ptolemy (100-170 AD) was based partly on the work of Aristotle. It was replaced by the Copernican theory (heliocentric) beginning around 1400 AD.
The Ptolemaic theory and the Copernican Theory
He went against the Aristotelian theory and he defended the Copernican theory.
Galileo
Nicolaus Copernicus
Copernican challenges beliefs by claiming sun-centered universe
Nicholaus Copernicus, a German/Polish astronomer and mathematician, developed the Copernican Theory, a revolutionary idea which changed our understanding of the universe and how it rotates and progresses. He developed the idea of Heliocentrism, then a theory, now a fact, that the the sun, not the earth, is the center of the universe with all the planets revolving around it. His book, De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres) was finished in 1532, however, because of Copernicus' fear of rejection from the Church and his peers, the book was not published until 1543, shortly before his death.
The Ptolemaic theory and the Copernican Theory.