ABSTRACT
Ibn Azzuz was himself able to establish the existence of such disagreements when he calculated the tasyfr of the significators of conjunctions, eclipses and their ascendents to determine the time of events of the past and, especially, the great battle of El Salado [Fahs Tarif] which took place in the days of the Marinid sultan Abu 1-Hasan A1T, in the month of Jumada I of 741. The times calculated did not correspond to historical reality, and Ibn Azzuz blamed Ibn Ishaq’s tables for the mistake. Therefore, in order to correct the divergence, he made observations with an armillary sphere ca. 745/1344: as a result he corrected Ibn Ishaq’s mean motion tables and cast again the corresponding horoscopes. This time, he obtained adequate results, once he had made the necessary corrections to the mean motion parameters deduced from observations.
