An astronomer from the Fergana Valley who worked at the House of Wisdom in Baghdad. His summary of Ptolemy's astronomy, known in Latin as Alfraganus, was read in European universities for centuries.
Key achievements
Wrote the Elements of Astronomy, read for centuries in Europe under the name Alfraganus
Reported the caliph al-Ma'mun's measurement of a degree of the meridian
Supervised the building of the Great Nilometer on Roda Island in Cairo in 861
