Because people liked to believe that the Earth was at the centre of the universe and the Ptolemaic model of the universe had been seen as accurate for so long that any other idea was disapproved. It's like Darwin's theory of evolution, at the time nobody liked to believe it, it was only years later that we realised it was an extremely likely theory.
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I think that Copernicus preferred to work alone because what he thought went against common religious beliefs.
aristotle
In the university of Krakow.
anex: developing a heliocentric theory
questioning the principles of scientific method