Al-Farghânî, known in the West as Alfraganus , was one of the most famous astronomers of the 9th century. His book, Elements of Astronomy, written in 833 CE remained as the most popular text book on astronomy until the 15th century, both in the West and in the East.
Alfraganus and the Elements of Astronomy
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Figure 1. The Tabula Rogeriana, drawn by al-Idrisi for Roger II of Sicily in 1154, one of the most advanced ancient world maps. Modern consolidation, created from the 70 double-page spreads of the original atlas. (Source)
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