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For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study. - Nicolaus Copernicus For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study. - Nicolaus Copernicus For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study. - Nicolaus Copernicus