which was a belief of copernicus’s model of the solar system

The planets move in perfect circles

All planets orbit the sun at the same time

The outer planets move in epicycles

Earth is fixed to a crystalline sphere

The planets move in perfect circles.

Copernicus’s model of the solar system included the belief that the planets move in perfect circles.

The belief of Copernicus's model of the solar system that is most accurate is "The planets move in perfect circles." Copernicus proposed a heliocentric model of the solar system, where the sun is at the center and the planets orbit around it. He believed that the planets moved in circular paths around the sun. However, it is important to note that Copernicus later realized that the planets actually move in elliptical (oval-shaped) orbits, but his initial belief was that they moved in perfect circles.