ʿAlī ibn ʿĪsā al-Asṭurlābī (Arabic: علي بن عيسى, fl. 832) was a 9th century Arab geographer and astronomer. He wrote a treatise on the astrolabe and was an opponent of astrology. During the reign of al-Ma'mun, and together with Khālid ibn ʿAbd al-Malik al-Marwarrūdhī, he participated in an expedition to the Plain of Sinjar to measure the length of a degree. Differing reports state that they obtained a result of 56 miles (90 km), 56 and two-thirds, or 56 and one-quarter miles per degree.
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This article is an automated import of the Wikipedia article "Ali ibn Isa al-Asturlabi", available at https://en.wikipedia.org/wiki/Ali_ibn_Isa_al-Asturlabi . Text is licensed under CC BY-SA 4.0.