Actually the ancient Greeks were the first to realize the world was round.
Nicolaus Copernicus < NOVA NET ANSWER
1500s
Nicholas Copernicus 1473-1543 was a Polish priest and astronomer who created an alternative model of the planets which put the Sun at the centre, instead of the Earth as generally accepted at that time.He knew it would get him into trouble with the church, and his book 'De Revolutionibus' was not published until the year he died. The theory with the Sun at the centre was similar to the old Ptolemaic system with its collection of circles and epicycles allowing for the changes in distance and the changes in planets' speeds, and their departure from the ecliptic.In the late 1500s Tycho Brahe made new more accurate observations of the planets from Denmark, and these were used by Johannes Kepler to produce a new model published in 1609.Kepler's model is the one we use today, and it has the Sun at the centre, like the Copernican model, but all the other details of Copernicus's theory were rejected in favour of elliptical orbits.
Nicolaus Copernicus's heliocentric theory, which posited that the Earth orbits the Sun, was shocking to people in the 1500s because it contradicted the long-held geocentric view endorsed by the Church, which placed the Earth at the center of the universe. This challenge to established beliefs not only threatened the theological understanding of humanity's place in the cosmos but also undermined the authority of the Church. Additionally, the geocentric model was deeply ingrained in the cultural and scientific thought of the time, making Copernicus's ideas revolutionary and controversial.
Aristrachus of SamosThe first man to theorize that the Earth revolved around the sun is believed to be Nicolas Copernicus. In the 1500s he speculated that rather than the sun circling the Earth, the Earth may actually orbit the sun.
copernicus?
Nicolaus Copernicus.
It was Copernicus.
It was Copernicus.
I am not sure which of his books you are asking us about, since he wrote at least three of them. But his best known was On the Revolutions of the Celestial Spheres (in Latin,De revolutionibus orbium coelestium). Nicolaus Copernicus was an astronomer, and this book taught something entirely new for the 1500s-- that the planets revolved around the sun.
Copernicus
Nicolaus Copernicus proposed the heliocentric model with circular orbits of the planets around the Sun in the 1500s. His work, "De revolutionibus orbium coelestium," laid the foundation for the Copernican Revolution in astronomy.
Nicolaus Copernicus < NOVA NET ANSWER
In the 1500s, Nicolaus Copernicus further developed the heliocentric explanation for the motion of the planets with his publication of "De revolutionibus orbium coelestium" (On the Revolutions of the Celestial Spheres) in 1543. He proposed that the Sun, not Earth, was the center of the solar system.
His views went against traditional beliefs, including those of the Roman Catholic Church.
His views went against traditional beliefs, including those of the Roman Catholic Church.
His views went against traditional beliefs, including those of the Roman Catholic Church.