Speculum Astronomiae and Its Enigma

The attribution of the Speculum Astronomiae to Albertus Magnus became a controversial issue only recently, when the great neo-Thomist historian Pierre Mandonnet suggested -- without any antecedents -- that the author was Roger Bacon rather than Albert. Mandonnet''s theses were refuted by Lynn Thorndike and have since then been the subject of widespread discussion.
The present historiographi...