no nicholus was not a greek astronomer for it was that he is from Poland< not Greece>
He was born in Poland, of parents who were both Polish. He grew up in Poland, was educated in Polish universities, lived almost his entire life in Poland, published all of his important works while in Poland, and died in Poland.
Because of these facts, most people consider him Polish, not Greek.
Incidentally, he was a true renaissance person, with his astronomical work occupying a very small amount of his time.
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he was a astronomer
Nicolaus Copernicus was a Polish astronomer. His greatest contribution was to assert that the earth revolves around the sun. At the time that Copernicus lived, the general conception was that the sun revolved around earth.
Nicolaus Copernicus was , by trade, a mathematician and astronomer. With this background, he was well suited to establish his theory of heliocentrism.
what did do in space
He was Prussian, and at that time Prussia was a part of Poland.