peoplepill id: ali-ibn-khalaf
AIK
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Alī ibn Khalaf (Arabic: علي بن خلف الأندلسي) was an Andalusian astronomer who belonged to the scientific circle of Ṣāʿid al- Andalusī.
He devised, with help from al-Zarqali, the universal astrolabe. Both Khalaf and al-Zarqali's design were included in the Libros del Saber (1227) of Alfonso X of Castile.
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Ali ibn Khalaf