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Ali Ibn Issa (arabe : علي بن عيسى — ʿAlī ibn ʿĪssā al-Asṭurlābī) était un astronome arabe du IX^e siècle, également orthographié Ali Ben Issa.

Avec Chalid ben Abdulmelik, en 827, il a mesuré la circonférence de la Terre, obtenant un résultat de 40 248 km (voire, selon d'autres sources, 41 436 km), le résultat exact étant de 40 075 km.

• Portail de l’astronomie
• Portail du haut Moyen Âge

На других языках

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[en] 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.[2] 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.[3]

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- [fr] Ali Ibn Isa

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[it] Ali ibn Isa

Alī ibn ʿĪsā al-Asṭurlābī (in arabo: علي بن عيسى‎; ... – ...; fl. IX secolo) è stato un astronomo e geografo arabo del IX secolo.

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[ru] Али аль-Астурлаби

Али ибн Иса аль-Астурлаби (араб. علي بن عيسى الاسطرلابي‎; IX век) — арабский астроном и географ IX века. Написал трактат об астролябии и был противником астрологии.

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