AbÃâ¦Ã« al-ÊÿAbbÃâÃÂs AáøÃÂ¥mad ibn MuáøÃÂ¥ammad ibn KathÃâër al-FarghÃâÃÂnÃâë. 800/805-870 also known as Alfraganus in the West, was an astronomer in the Abbasid court in Baghdad, and one of the most famous astronomers in the 9th century. The lunar crater Alfraganus is named after him.