Overview: The attribution of the .Speculum Astronomiae. to AlbertusMagnus became a controversial issue only recently, when the greatneo-Thomist historian Pierre Mandonnet suggested -- without anyantecedents -- that the author was Roger Bacon rather than Albert.Mandonnet‘s theses were refuted by Lynn Thorndike and have since thenbeen the subject of widespread discussion. .The present historiographical case-study considers this debate in thelight of an analysis of texts by Albert himself, as well as otherimportant authors, such as Bacon, Bonaventura, Thomas Aquinas, Witelo,Campanus of Novara, an
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