Albertus Magnus produced the Speculum Astronomiae (The Mirror of Astronomy) (de refutatione librorum astronomiae, incipit Occasione quorundam librorum apud quos non est radix sciencie) sometime after 1260 to defend astrology as a Christian form of knowledge (Zambelli, 1992; Hendrix, 2007). Though Albert's authorship of this text has been debated by such scholars as Pierre Mandonnet and, more recently, Nicholas Weill-Parot, some scholars recognized it as a genuinely Albertine work (Mandonnet, 1910; Weill-Parot, 2002; Hendrix, 2010; Thorndike, 1923–28; Lemay, N.D.).