/kloc-in the 6th century, Copernicus began to design his Heliocentrism model. Copernicus' work is based on Aristak, an ancient Greek astronomer (Aristak and Herakrit mentioned that the sun is the center of the universe and the earth revolves around the sun in the west for more than 300 years BC), and referred to the theories of Maragai School and many famous philosophers in the Islamic world. /kloc-At the beginning of the 6th century, Copernicus summed up the basic ideas of his celestial motion theory in a paper entitled "Short Theory".

15 14 years, Copernicus's manuscripts began to spread among friends, including many astronomers and scholars. This 40-page manuscript records the idea of Heliocentrism Hypothesis, and Heliocentrism Hypothesis contains seven basic principles. Specifically including:

All celestial bodies have no concentric center;

The earth is the center of the moon's orbit;

All celestial bodies revolve around the sun, and the center of the universe is near the sun;

The distance between the earth and the sun is insignificant compared with the distance between the earth and the sun and the stars, because the distance is far away and our lines of sight to watch the stars are almost parallel, so the parallax is close to zero;

The back-and-forth movement of the planet that people see is caused by the movement of the earth;

The earth goes around the sun once, which is an annual movement around the sun. There are more than one way for the earth to move (the earth has some movements besides rotation);

The earth's orbit around the sun makes the planets look in opposite directions.