One of the famous astronomers in the 9th century. Born in 805 at Ferghana (present Uzbekistan), he worked in Baghdad, where he was connected to the group of scholars led by the brothers Banu Musa. Later he moved to Cairo, where he composed a very important treatise on the astrolabe around 856. There he also supervised the construction of the large Nilometer on the island of al-Rawda (in Old Cairo) in 861. Al-Farghani died around 880.
Abū 'l-'Abbās Ahmad Ibn Muhammad Ibn Kathīr Al-Farghānī
أبو العباس أحمد بن محمد بن كثير الفرغاني
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