Ibn al-Shatir's Improved Planetary Models
c. 1350 CE · Medieval
In Damascus around 1350 CE, Arab astronomer Ibn al-Shatir developed non-Ptolemaic models of planetary motion that eliminated the equant and improved mathematical solutions for predicting celestial positions. Working as timekeeper at the Umayyad Mosque, he detailed these models in his treatise 'Kitab nihayat al-sul fi tashih al-usul'. His geocentric models used epicycles and the Tusi-couple to achieve uniform circular motion, producing more accurate observational results. His mathematical models for lunar and planetary motion were later found to be nearly identical to those developed by Copernicus in the 16th century.
Key Figures
Ibn al-Shatir
Locations
DamascusUmayyad Mosque
Topics
astronomyplanetsmathematicsheliocentrismIslamic astronomy
Connected Events — 4 Connections
Islamic astronomical critiques of Ptolemaic models created intellectual climate questioning established cosmic order that influenced European scholars like Nicholas of Cusa to challenge fundamental cosmological assumptions Nicholas of Cusa Postulates an Infinite, Centerless Universe
Ibn al-Shatir's elimination of Ptolemaic equants and development of non-geocentric planetary models established the mathematical framework and conceptual precedent for partially heliocentric systems that Nilakantha would later develop independently Nilakantha Somayaji Proposes Partially Heliocentric System
Ibn Rushd's insistence that astronomy must conform to Aristotelian natural philosophy established the research program that culminated in Ibn al-Shatir's physically consistent planetary models, which eliminated the problematic devices Ibn Rushd had criticized Ibn Rushd Critiques Ptolemaic Epicycles
Ibn al-Shatir directly adopted and refined al-Tusi's couple mechanism, incorporating it into more sophisticated planetary models that eliminated both the equant and Ptolemy's problematic constructions Nasir al-Din al-Tusi Invents the Tusi-couple Mechanism
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