Heliocentrism was first proposed by the ancient Greek astronomer Alistair in the 3rd century BC (3 10-230 BC). He believes that the planets orbit the sun in a circular orbit, the earth orbits the sun once a year, and the earth rotates around its own axis once a day. The outermost is a star. Stars and the sun are fixed. The details of this theory have not been handed down, because its basic idea far exceeds people's intuitive experience and common sense.

The development of Heliocentrism

/kloc-In the first half of the 6th century, under the guidance of the belief that the universe is simple and harmonious, the Polish astronomer Copernicus put forward the Heliocentrism again on the basis of astronomical observation data and mathematical calculation. But in his theory, the sun is not completely in the center of the planet's circular orbit, but deviates from the center of the circle. Because the sun is still in his Heliocentrism, this theory is also called heliostat theory.

Heliocentrism of Copernicus was later perfected by the German astronomer Kepler. His three laws of planetary motion correctly describe the focal position of the sun, the elliptical orbit and variable-speed motion of the planet, and express the rotation motion of the sun. This theory later became the structural theory of the solar system.