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.
Ibn al-Jawzi ʿAbd al-Raḥmān b. ʿAlī b. Muḥammad Abu ’l-Faras̲h̲ b. al-Jawzī (1126 – 14 June 1200), often referred to as Ibn al-Jawzī (Arabic: ابن الجوزي, "Ibn al-Jawzī"; 1126 – 14 June 1200) for short, or reverentially as Imam Ibn al-Jawzī by Sunni Muslims, was an Arab Muslim jurisconsult, preacher, orator, heresiographer, traditionist, historian, judge, hagiographer, and philologist who played an instrumental role in propagating the Hanbali school of orthodox Sunni jurisprudence in his native Baghdad during the twelfth-century. During "a life of great intellectual, religious and political activity," Ibn al-Jawzi came to be widely admired by his fellow Hanbalis for the tireless role he played in ensuring that that particular school – historically, the smallest of the four principal Sunni schools of law – enjoy the same level of "prestige" often bestowed by rulers on the Maliki, Shafi'i, and Hanafi rites.