He looked in the sky and saw it, as had many people for thousands of years before him. He did not discover it. It has been possible to see for as long as humans have been around. When it is visible, it is one of the easiest things to see in the sky.
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it was know in ancient times that Venus passes between the Earth and the Sun, and Copernicus had a model which had the Sun at the centre, so in his model Venus was closer to the centre, thus an inferior planet by definition.
it was know in ancient times that Venus passes between the Earth and the Sun, and Copernicus had a model which had the Sun at the centre, so in his model Venus was closer to the centre, thus an inferior planet by definition.
Nicholas Copernicus.
Nicholas Copernicus did