What do Ibn al-Shatir and Ibn Tufail have in common?
Ibn al-Shatir Ibn al-Shatir or Ibn ash-Shatir (Arabic: ابن الشاطر‎ ‎ ; 1304–1375) was an Arab astronomer. He worked as "muwaqqit" (موقت, religious timekeeper) in the Umayyad Mosque in Damascus and constructed a sundial for its minaret in 1371/72.
Ahmad al-Wafi Aḥmad al-Wafī (proper name: ʿAbdullāh ibn Muḥammad ibn Ismāʿīl, Arabic: عبد اللّه بن محمد بن إسماعيل‎ ‎ ; born 766-828 CE/149-212 AH in Salamiyah, Syria; Imamate 809-828 CE/193-212 AH) is the eighth Isma'ili Imam. He was the son and successor of the seventh Imam, Muhammad ibn Isma'il. He was called "al-Wafi" "true to his word".