‘Umar ibn Yusuf ibn ‘Umar ibn ‘Ali ibn Rasul al-Muzaffari, dated 690 AH/1291 CE. Astrolabe of ‘Umar ibn Yusuf ibn ‘Umar ibn ‘Ali ibn Rasul al-Muzaffari, by ‘Umar ibn Yusuf ibn ‘Umar ibn ‘Ali ibn…
