- See Abu Jafar al-Muradi for the Egyptian grammarian.
Fragment of The Book of Secrets in the Results of Thoughts. 11th century
Alī Ibn Khalaf al-Murādī, (أبو جعفر علي ابن خلف المرادي; 11th century) was an Andalusian mathematician and astronomer who belonged to the scientific circle of Ṣāʿid al- Andalusī.
He was the author of the technological manuscript entitled Kitāb al-asrār fī natā'ij al-afkār (Arabic: كتاب الأسرار في نتائج الأفكار, The Book of Secrets in the Results of Thoughts or The Book of Secrets in the Results of Ideas). It was copied and used at the court of Alfonso VI of León and Castile in Christian Spain in the 11th century.
The manuscript provides information about a "Castle and Gazelle Clock" and many other forms of complicated clocks and ingenious devices. Al-Muradi was a contemporary of Abū Ishāq Ibrāhīm al-Zarqālī.
In 2008, the Book of Secrets of al-Muradi has been published in facsimile, translated in English/Italian/French/Arabic and in an electronic edition with all machines interpreted in 3D, by the Italian study center Leonardo3.
He also devised, with help from al-Zarqali, the universal astrolabe. Both al-Muradi and al-Zarqali's design were included in the Libros del Saber (1227) of Alfonso X of Castile.
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- ^ Calvo, Emilia (22 September 2017). "Some Features of the Old Castilian Alfonsine Translation of ʿAlī Ibn Khalaf's Treatise on the Lámina Universal". Medieval Encounters. 23 (1–5): 106–123. doi:10.1163/15700674-12342244.
- ^ Ahmed Djebbar, "Technology in the service of progress: The examples of hydraulic technologies," in Civilization in the Mirror of Universal, UNESCO, 2010, p. 292-304.
- ^ David A. King, World-maps for finding the direction and distance to Mecca, (Brill, 1999), 330.
- ^ Koenraad Van Cleempoel. "The Migration of Instrumental Knowledge from Flanders to Spain," in: Silent Messengers: The Circulation of Material Objects of Knowledge in the Early Modern Low Countries, Sven Dupré and Christoph Herbert Lüthy (eds.), (Transaction Publishers, 2011), p. 76.