Ahmad al-Fergani (full name Abul Abbas Ahmad ibn Muhammad ibn Katir al-Fergani) (798 Fergana - 865 Egypt) - worked in astronomy, mathematics, geography and other fields of science. Uzbek encyclopedist. He is known in the East as Al-Fergani, and in Europe as Alfraganus. Very little is known about his life and work, and little is known about him. Life of scientific research and improvement of Ahmad al-Fergani Rules of the dynasty The Arab Caliphate became one of the largest kingdoms in the world, and many thinkers from Movarounnahr, Khorezm and Khorasan began to play an important role in its socio-political and cultural life.