Nicolas Copernicus explaining his planetary system to Alexander VI and artists of the Papal court. Photomechanical reproduction of a wood engraving by [W.G.] after A. Gerson.

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Nicolas Copernicus explaining his planetary system to Alexander VI and artists of the Papal court. Photomechanical reproduction of a wood engraving by [W.G.] after A. Gerson. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.