Achmed Ibn Ketir [Alfraganus] (? - ca. 840)
also known as: Alfragan, Alfergan, Alfragan, Alfraganus, Achmed Ibn Ketir, al-Farghani [al Fargani], Muhammed Ebn Ketir

Alfraganus was born in Fergana in the 10. century and worked as Astronomer for the Kalif Al-Mamun. He wrote an introduction to Astronomy which was republished in Latin six times between 1493 and 1669, it contained 30 chapters. Other works covered sundials and the usage of astrolabes.

Illustr. Lexikon der Astronomie, by Adolph Drechsler, Verlag J.J. Weber, Leipzig 1881, p. 7

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