805 - 880
About the artist
Ahmad ibn Muhammad ibn Kathir al-Farghani , also known in the West as Alfraganus (Arabic : أبو العباس أحمد بن محمد بن كثير الفرغاني ) was one of the famous astronomers in the 9th century. Born in 805 at Ferghana (present Uzbekistan), Al-Farghani worked in Baghdad where he was involved in the calculation of the diameter of the Earth together with a team of scientists under the patronage of al-Ma'mūn. Later he moved to Cairo, where he composed his important work Elements which was written between 833 and 857. The book was a readable summary of Ptolemaic astronomy and was extensively studied in Europe from the 12th to the 17th century. Two treatises on astrobes by AlFarghani also survive. Al-Farghani died around 880.