Nicolas Copernicus did not use a telescope, the use of the telescope to study the solar system was not done until over 50 years later by Galileo.
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Because he didn't invent the Telescope so he saw it from his naked eye
The only part of Copernicus's theory that Kepler retained was the idea that the Sun is at the centre of the Solar System.
because before Copernicus there was not much technology and later on in time there was more discoveries of existence of technology. which means people were able to prove his ideas. <3 <<>> Copernicus had a theory of the way the planets move around that had some advantages over the older Ptolemaic system which had the Earth at the centre. Copernicus had the Sun at the centre, which caused problems with the church when Galileo took the theory up and promoted it as the truth. Tycho Brahe also produced a system with the Earth at the centre. Tycho's system removed some of the faults in the Ptolemaic theory, specifically the full range of Venus's phases. Finally, the theory that lasted until modern times was that of Johannes Kepler (1609). He used the new idea of elliptical orbits, and also followed Copernicus in placing the Sun at the centre. Kepler's theory was generally accepted after Newton's expanation of elliptical orbits in terms of the theory of gravity.
Johannes Kepler
Copernicus proved to mankind that the sun was the center of the universe, not the Earth. We know now that he was mostly correct. The sun is the center of the solar system.