Actually the ancient Greeks were the first to realize the world was round.
The astronomer Copernicus publicly stated in the 1500s that Earth revolves around the Sun, contrary to the prevailing belief at the time that the Earth was the center of the universe. This heliocentric model laid the foundation for modern astronomy and challenged the geocentric view established by Ptolemy.
Nicolaus Copernicus < NOVA NET ANSWER
1500s
Kepler's assumptions about orbits differed from Copernicus in that Kepler proposed that planetary orbits were elliptical rather than circular. Copernicus had assumed circular orbits in his heliocentric model of the universe. Kepler's discovery of elliptical orbits led to his three laws of planetary motion.
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.
This belief was known as the geocentric theory, which proposed that the Earth was the stationary center of the universe, with all celestial bodies revolving around it. This theory dominated scientific thought until the development of the heliocentric model by astronomers such as Copernicus and Galileo in the 16th century.
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.
The first astronomer to dispute the model seriously was Nicholas Copernicus in the 1500s. His model used circles and epicycles, like the old Ptolemaic model, but had the Sun at the centre, which led to its being named the heliocentric model. Sixty years after his death in 1543, the Copernicus model was taken up by Galielo in his dispute with the Catholic church. In the latter half of the 1600s further discoveries led to wider acceptance of the heliocentric concept. However the rest of the Copernicus model was discarded and replaced by Kepler's model which had each planet in an elliptical orbit, and this was taken up and given scientific credibility by the discoveries of Newton and others.
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.