Ali ibn Isa al-Asturlabi
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Who is Ali ibn Isa al-Asturlabi?
ʿAlī ibn ʿĪsā al-Asṭurlābī was an Afro-Arab 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. He measured the Earth's circumference, getting a result of 40,248 km.
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"Ali ibn Isa al-Asturlabi." Biographies.net. STANDS4 LLC, 2024. Web. 29 Apr. 2024. <https://www.biographies.net/people/en/ali_ben_isa>.
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