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).

See also

Notes

  1. ↑ H., Suter,. "al-BADĪʿ al-ASṬURLĀBĪ". Encyclopaedia of Islam, Second Edition. Brill. doi:10.1163/1573-3912_islam_sim_0993. Retrieved 11 February 2017.
  2. ↑ Bolt 2007.

References

  • Bolt, Marvin (2007). "ʿAlī ibn ʿĪsā al‐Asṭurlābī". In Thomas Hockey; et al. The Biographical Encyclopedia of Astronomers. New York: Springer. p. 34. ISBN 978-0-387-31022-0. (PDF version)
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