It was not until the 16th century that Ptolemy’s system was challenged seriously. A Polish churchman named Nicolaus Copernicus claimed that the Earth and the planets orbited the Sun. His ideas were backed up in 1610 when Galileo Galilei used a telescope to view the moons of Jupiter, proving that not everything orbited the Earth.
In the early 1500s, when virtually everyone believed Earth was the center of the universe, Polish scientist Nicolaus Copernicus proposed that the planets instead revolved around the sun. Although his model wasn’t completely correct, it formed a strong foundation for future scientists to build on and improve mankind’s understanding of the motion of heavenly bodies.
Indeed, other astronomers built on Copernicus’ work and proved that our planet is just one world orbiting one star in a vast cosmos loaded with both, and that we’re far from the center of anything. Here is a brief biography of Copernicus:
In Copernicus’ lifetime, most believed that Earth held its place at the center of the universe. The sun, the stars, and all of the planets revolved around it. One of the glaring mathematical problems with this model was that the planets, on occasion, would travel backward across the sky over several nights of observation. Astronomers called this retrograde motion. To account for it, the current model, based on the Greek astronomer and mathematician Ptolemy’s view, incorporated a number of circles within circles — epicycles — inside of a planet’s path. Some planets required as many as seven circles, creating a cumbersome model many felt was too complicated to have naturally occurred.
In 1514, Copernicus distributed a handwritten book to his friends that set out his view of the universe. In it, he proposed that the center of the universe was not Earth, but that the sun lay near it. He also suggested that Earth’s rotation accounted for the rise and setting of the sun, the movement of the stars, and that the cycle of seasons was caused by Earth’s revolutions around it. Finally, he (correctly) proposed that Earth’s motion through space caused the retrograde motion of the planets across the night sky (planets sometimes move in the same directions as stars, slowly across the sky from night to night, but sometimes they move in the opposite, or retrograde, direction).
Copernicus finished the first manuscript of his book, “De Revolutionibus Orbium Coelestium” (“On the Revolutions of the Heavenly Spheres”) in 1532. In it, Copernicus established that the planets orbited the sun rather than the Earth. He laid out his model of the solar system and the path of the planets.
He didn’t publish the book, however, until 1543, just two months before he died. He diplomatically dedicated the book to Pope Paul III. The church did not immediately condemn the book as heretical, perhaps because the printer added a note that said even though the book’s theory was unusual, if it helped astronomers with their calculations, it didn’t matter if it wasn’t really true, according to Famous Scientists. It probably also helped that the subject was so difficult that only highly educated people could understand it. The Church did eventually ban the book in 1616.
The Catholic Church wasn’t the only Christian faith to reject Copernicus’ idea. “When ‘De Revolutionibus Orbium Coelestium’ was published in 1543, religious leader Martin Luther voiced his opposition to the heliocentric solar system model,” “His underling, Lutheran minister Andreas Osiander, quickly followed suit, saying of Copernicus, ‘This fool wants to turn the whole art of astronomy upside down.'”
Copernicus died on May 24, 1543, of a stroke. He was 70. He was buried in Frombork Cathedral in Poland, but in an unmarked grave. Remains thought to be his were discovered in 2005.
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