Alī Ibn Khalaf al-Murādī, (11th century) Al-Andalus, was an engineer and author of the unique technological manuscript entitled Kitāb al-asrār fī natā'ij al-afkār (The Book of Secrets in the Results of Thoughts).[1] 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.
He also devised, with help from al-Zarqali, the universal astrolabe.[2] Both al-Muradi and al-Zarqali's design were included in the Libros del Saber(1227) of Alfonso X of Castile.[3]