| From: Thomas Hockey et al. (eds.). The Biographical Encyclopedia of Astronomers, Springer Reference. New York: Springer, 2007, p. 34 |
|
Courtesy of 
|
ʿAlī
ibn ʿĪsā al-Asṭurlābī
Marvin Bolt
Flourished Damascus, (Syria), 832
ʿAlī ibn ʿĪsā al-Asṭurlābī, author of an early Arabic treatise on
the astrolabe and an opponent of astrology, enjoyed renown as an astronomical
instrument maker and contributed to observations initiated by the ʿAbbāsid caliph Maʾmūn. He took part with Khālid ibn ʿAbd al-Malik al-Marwarrūdhī and others in an expedition to the Plain of Sinjār
to measure 1° of latitude and, thus, the size of the Earth. ʿAlī ibn ʿĪsā made astronomical observations at Baghdad in 829/830 and at Damascus in
832–833. He divided the mural quadrant used for the Damascus observations
to confirm results of the earlier missions.
Selected References
Barani, Syed Hasan (1951). “Muslim Researches in
Geodesy.” In Al‐Bīrūnī
Commemoration Volume, A.H. 362–A.H. 1362, pp. 1–52. Calcutta: Iran
Society. (Includes transcriptions and an analysis of Arabic primary sources,
as well as translations.)
King, D. A. (2000). “Too Many Cooks … A New
Account of the Earliest Geodetic Measurements.” Suhayl 1: 207–241.
(Provides translated texts related to ʿAlī ibn ʿĪsā's involvement
with measuring the Earth.)
Rosenfeld, B. A. and Ekmeleddin Ihsanoğlu (2003). Mathematicians, Astronomers, and Other Scholars of Islamic Civilization and Their Works (7th– 19thc.). Istanbul: IRCICA, p. 28.
Sarton, George (1927). Introduction to the History of Science. Vol. 1, p. 566. Baltimore: Published for the Carnegie Institution of Washington by Williams and Wilkins.
Sayılı, Aydın (1960). The Observatory in Islam. Ankara: Turkish Historical Society. (See Chap. 2, “Al Maműn's Observatory Building Activity,” pp. 50–87, for a valuable discussion, beginning with a thorough analysis of early Islamic astronomical observations.)