You have answered this question for yourself. It was 'Nicolas Copernicus' , hencethe word 'copernican'.
Nicolaus Copernicus
Galileo
Nicolaus Copernicus developed and published an astronomical model in 1543 that put the sun at the center of the universe. This model became known as Copernican heliocentrism.
Not much, both believed in heliocentrism. That planets revolve around the sun and not everything around the earth, which was the belief that many including the Catholic Church insisted on. Copernicus believed they travelled in circles, and later thanks to Kepler we know they are eliptical. Galileo never accepted this.
Heliocentrism.
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.
Galileo
Nicolaus Copernicus developed and published an astronomical model in 1543 that put the sun at the center of the universe. This model became known as Copernican heliocentrism.
No, Tycho believed the Earth was at the centre, and he produced an alternative geocentric model that fully explained Venus's phases, which the old Ptolemaic system failed to do.This spoilt Galileo's argument that the Copernican system must be correct and the Sun must be at the centre. However the modern view is that the Sun is at the centre, for reasons that Galileo was not aware of in his lifetime.
The church ordered Galileo to abandon the Copernican idea of heliocentrism because it conflicted with the prevailing biblical interpretation of a geocentric universe, where the Earth is the center of the universe. The church believed that this view would undermine the authority of the Bible and cause confusion among the faithful. Additionally, Galileo's advocacy for heliocentrism challenged the church's authority and power.
In Heliocentrism, the Sun (Helios) is said to be at the centre of the universe.
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Galileo supported the Copernican system, but Aristotle did not. The Copernican system was a belief that the sun was the center of the solar system.
Not much, both believed in heliocentrism. That planets revolve around the sun and not everything around the earth, which was the belief that many including the Catholic Church insisted on. Copernicus believed they travelled in circles, and later thanks to Kepler we know they are eliptical. Galileo never accepted this.