Ali ibn Isa al-Asturlabi
ʿAlī ibn ʿĪsā al-Asṭurlābī (Arabic: علي بن عيسى) was an Arab[1] astronomer and geographer of the 9th century. 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, or the circumference of the Earth.[2] He measured the Earth's circumference, getting a result of 40,248 km (or, according to other sources, 41,436 km).[citation needed]
See also[]
- List of Arab scientists and scholars
Notes[]
- ^ H., Suter. "al-BADĪʿ al-ASṬURLĀBĪ". Brill. doi:10.1163/1573-3912_islam_sim_0993. Cite journal requires
|journal=(help) - ^ Bolt 2007.
References[]
- Bolt, Marvin (2007). "ʿAlī ibn ʿĪsā al‐Asṭurlābī". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. p. 34. ISBN 978-0-387-31022-0. (PDF version)
Categories:
- Medieval Arab astronomers
- Medieval Arab geographers
- Medieval Iraqi astronomers
- Medieval Iraqi geographers
- Astronomers of the Abbasid Caliphate
- 9th-century astronomers
- 9th-century people of the Abbasid Caliphate
- 9th-century Arabs