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Two famous astronomers during the Renaissance were Nicolaus Copernicus, who proposed the heliocentric model of the universe, and Galileo Galilei, who made significant observations with his telescope supporting the heliocentric model and challenging the geocentric view of the universe.
The heliocentric idea, with the Sun at the centre, was part of a prediction model using circles and epicycles devised by Copernicus, called the heliocentric model. The heliocentric idea was adopted by Kepler in his work that led to the discovery of Kepler's laws of planetary motion. It was also used by Galileo in a famous dispute with the Catholic church which was not about to change its ideas without adequate evidence. The evidence came after Galileo's time when Newton made the necessary theoretical discoveries to understand the way the Sun's gravity produces planets' orbits. Since then everyone believes that the Sun is at the centre.
Nicolaus Copernicus and Galileo Galilei were two scientists who believed that the Earth revolved around the Sun, a theory known as heliocentrism. Their work challenged the prevailing geocentric model of the universe and laid the foundation for modern astronomy.
Nicolaus Copernicus and Johannes Kepler were two famous astronomers during the Renaissance period. Copernicus is known for proposing the heliocentric model of the universe, while Kepler is known for his three laws of planetary motion.
Theres the Geocentric model, with earth at the centre and the planets and sun revolving around us. Then there is the Heliocentric model, with the sun at the centre and all of the planets including Earth revolving about it. The second model is the correct model, though for many years people assumed incorrectly that the Earth was at the centre of the universe.