It was because people that that his calculations were not accurate and also because his calculations of the astronomical positions was not made easy. It was hard to understand
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that the world was heliocentric not geocentric aka sun centered universe and earth centered universe
Contrary to most people of the 14th Century, Copernicus believed that the Earth revolved around the sun. Galileo later proved Copernicus' theory to be correct.
Nicolas Copernicus
Sun is center of solar system!
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.