ʿAlī ibn Mar Hasan haDayyan, Qadi al-Qurtubi

Hasan ben Mar Hasan, also known as ʿAlī ibn Mar Hasan was born somewhere in al-Andalus in the tenth century. He was dayyan (judge) of Cordova in the late tenth century. He wrote three books on the calendar and intercalation that are no longer extant, but which are referred to in the writings of Isaac Israeli (Yesod ʿ Olam), Abraham bar Ḥiyya (Sefer ha-ʿIbbur), and Abraham ibn Ezra (Sefer ha-ʿIbbur). The date he used in his astronomical calculations (972), in which he followed the system of the Arab astronomer al-Battānī (d. 929), is the only certain reference we have to date his lifetime.

Josefina Rodríguez Arribas

Bibliography

Ashtor, Eliyahu. The Jews of Moslem Spain, vol. 1 (Philadelphia: Jewish Publication Society, 1973), pp. 300 and 439–440.

Steinschneider, M. “An Introduction to the Arabic Literature of the Jews II (continued),” Jewish Quarterly Review 13, no. 1 (1900): 92–110.

———. Die arabische Literatur der Juden (Frankfurt, 1902; repr. Hildesheim: Olms, 1964), pp. 117–118.

Citation Josefina Rodríguez Arribas. " Ḥasan ben Mar Ḥasan." Encyclopedia of Jews in the Islamic World. Executive Editor Norman A. Stillman. Brill Online , 2012. Reference. Jim Harlow. 10 July 2012 <http://referenceworks.brillonline.com/entries/encyclopedia-of-jews-...>