the copernician model of the solar system was a ___

heliocentric

The Copernican model of the solar system was a heliocentric model.

The Copernican model of the solar system was a heliocentric model.

To derive this answer, one can use general knowledge or conduct a simple internet search. The Copernican model was proposed by Nicolaus Copernicus in the 16th century, and it revolutionized the understanding of the solar system by putting the Sun at the center instead of the Earth. This concept of the Sun being at the center of the solar system is known as heliocentrism.