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Paper: The First Cosmological Works (Rasāʾil al-Hayʾa) in the Islamic Period: a Comparison between al-Farghānī's Jawāmiʿ ʿIlm al-Nujūm and the 3rd Book of Kūshyār's al-Zīj al-Jāmiʿ
Volume: 520, Astronomical Heritage of the Middle East
Page: 209
Authors: Ghalandari, H.
Abstract: Hayʾa is a general name for historical astronomical manuscripts that provide a geometrical description of the configuration of the world. Most of this kind of astronomical works were written by Islamic scholars most likely influenced by Ptolemy's Planetary Hypotheses. Most of Islamic hayʾa works have a similar structure and order of chapters, and were written in the 6th century AH (12th century AD). Nevertheless, some astronomical works from the 3rd–4th centuries AH (9th–10th centuries AD) have similarities with the hayʾa works, so we can call them the “predecessors” of the hayʾa. Al-Farghānī's Jawāmiʿ ʿIlm al-Nujūm and the third chapter of Kūshyār's al-Zīj al-Jāmiʿ are two important works among these predecessors. Considering the typical four chapter-organization of Hayʾa works, i.e., mathematical and physical introduction, configuration of the heavens, mathematical geography, and masses and distances (Ab‘ād wa Ajrām), we conclude in this article that these two treatises are impressive predecessors to the hayʾa, and that the third chapter of Kūshyār's al-Zīj al-Jāmiʿ is more similar to the subsequent Hayʾa works.
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