The achievement of Copernicus's life is his magnum opus "On the Operation of Celestial Bodies", which is divided into six volumes. In the volume 1, Copernicus tells the movement of the earth and the structure of the universe, refuting Ptolemy's theory that the earth is the center of the universe. In the last five volumes, he clarified the proposition of 1 volume with accurate observation records and rigorous mathematical argumentation.
Copernicus said: The sun stands at the center of the universe, and the planets revolve around the sun. The nearest to the sun is Mercury, followed by Venus, and then the earth. The moon goes around the earth and is a satellite of the earth. The planets farther from the sun than the earth are Mars, Jupiter and Saturn in turn. The farther a planet is from the sun, the bigger its orbit and the longer its period. Beyond the orbit of the planet, there is a starry sky full of stars. Copernicus mistakenly described the sun as the center of the universe, and his model of the universe was based on the structural diagram of the solar system observed by the naked eye.
Copernicus's works could not be published for a long time, and later his friends secretly printed them in Nuremberg, Germany. 1543 On May 24th, Copernicus, who was blind, stroked the newly published theory of celestial bodies and said, "I finally pushed the earth." On July 26th, Copernicus died.