Ahmad ibn Muhammad ibn Kathīr al-Farghānī

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Abū al-ʿAbbās Aḥmad ibn Muḥammad ibn Kathīr al-Farghānī (Arabic: أبو العبّاس أحمد بن محمد بن كثير الفرغاني) also known as Alfraganus in the West (c. 800 – 870), was an astro