page_title: Jabir ibn Aflah
section_title: Inventor
hierarchical_section_title: Jabir ibn Aflah / Inventor
caption_attribution_description: English: German National Museum (Nuremberg/Germany). Torquetum (1568), made by Johannes Praetorius in Nuremberg. Deutsch: Germanisches Nationalmuseum (Nürnberg/Deutschland). Torquetum (1568), von Johannes Praetorius in Nürnberg.
context_page_description: Abū Muḥammad Jābir ibn Aflaḥ was an Arab Muslim astronomer and mathematician from Seville, who was active in 12th century al-Andalus. His work Iṣlāḥ al-Majisṭi influenced Islamic, Jewish, and Christian astronomers.
context_section_description: He invented an observational instrument known as the torquetum, a mechanical device to transform between spherical coordinate systems.
caption: The Torquetum was invented by Jabir ibn Aflah.
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