Mikolaj kopernik (1473- 1543) is a Polish astronomer, the founder of Heliocentrism and the founder of modern astronomy. After long-term astronomical observation and research, Copernicus founded a more scientific cosmic structure system-Heliocentrism, and since then denied the geocentric theory that ruled the West 1000 years. Heliocentrism was accepted by people after a hard struggle. This is a great revolution in astronomy, which not only caused a major innovation in human world outlook, but also fundamentally shook the theoretical pillar of religious theology in medieval Europe. "Since then, natural science has been liberated from theology" and "the development of science has made great progress since then" (Engels' Dialectics of Nature). Copernicus wrote Heliocentrism's theory of celestial motion (published in 1543). Due to the limitation of the times, he kept the so-called "perfect" circular orbit in Heliocentrism. Later, Kepler established three laws of planetary motion, Newton discovered the law of universal gravitation, and planetary aberration and parallax were discovered one after another, so Heliocentrism was built on a more solid scientific basis.