ʿAlī ibn ʿĪsā al-Asṭurlābī (Arabic:علي بن عيسى, fl. 832) was a 9th centuryArabgeographer andastronomer. He wrote atreatise on theastrolabe and was an opponent ofastrology. During the reign ofal-Ma'mun, and together withKhālid ibn ʿAbd al-Malik al-Marwarrūdhī, he participated in an expedition to the Plain ofSinjar to measure the length of adegree.^[1] 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.^[2]

• Bolt, Marvin (2007)."ʿAlī ibn ʿĪsā al-Asṭurlābī". In Hockey, Thomas; et al. (eds.).Biographical Encyclopedia of Astronomers.Springer Publishers.
• Mercier, Raymond (2008). "Geodesy". In Selin, Helaine (ed.).Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Vol. 1 (2nd ed.). Berlin:Springer Nature.ISBN 978-14020-4-559-2.

• ʿAlī ibn ʿĪsā al-Asṭurlābī, Kitāb al-ʿamal bi-l-asṭurlāb, ed. by P. Louis Cheikho : "'Kitāb al-ʿamal bi-l-asṭurlāb li-ʿAlī ibn ʿĪsā", in: al-Mashriq 16 (1913), pp. 29–46; transl. German by Carl Schoy, "ʿAlī ibn ʿĪsā, Das Astrolab und sein Gebrauch", in: Isis 9 (1927), pp. 239–254.

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