| 1 | Nicolas Copernicus challenged the mindset and found that it was heliocentric. | |
| 2 | The achievement in astronomy was the revival and proof of the heliocentric theory that is regarding the sun as center. | |
| 3 | Copernicus and the Aristotelian Tradition: Education, Reading, and Philosophy in Copernicus's Path to Heliocentrism ( History of Science and Medicine Library ) , 15 | |
| 4 | Copernicus was a Polish astronomer and mathematician who was the first astronomer to formulate a scientifically based heliocentric cosmology that displaced the Earth from the centre of the universe. | |
| 5 | Galileo's observations with his new telescope convinced him of the truth of Copernicus's sun-centered or heliocentric theory . |
