The Heliocentric theory was significant because Copernicus had proved something such a long time ago... the fact that it hasn't been proven wrong, or the fact that no-one else believed him because they didnt have the technology to prove it back then.
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Copernicus' heliocentric theory was significant because it challenged the prevailing geocentric worldview of the time, which placed Earth at the center of the universe. His theory proposed that the Earth and other planets revolved around the Sun, marking a major shift in scientific understanding and laying the foundation for modern astronomy. It ultimately revolutionized our understanding of the cosmos.
Nicolaus Copernicus was the promoter of the heliocentric theory, which states that the Earth and other planets revolve around the Sun. He published his theory in his book "De revolutionibus orbium coelestium" in 1543.
Aristarchus of Samos
He was a Polish mathematician who disagreed with Ptolemy's view that the earth is the center of the universe. The heliocentric theory is the theory that the sun is the center of the universe, not the earth.
Galileo did not propose a heliocentric theory, he agreed with Copernicus and his heliocentric theory. The Catholic church, at the time, disagreed and they held a huge amount of power and put him on trial.
Copernicus published his heliocentric theory in 1543 in his book "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Celestial Spheres).