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Ibn ash-Shāį¹­ir
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Ibn ash-Shāį¹­ir

Islamic mathematician
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Ibn al-Shāį¹­ir (1305ā€“1375) was a Syrian astronomer and mathematician. He is known for developing a sophisticated astrolabe capable of solving spherical astronomy problems in five different ways. His work built upon the advancements of the Marāghah school, focusing on refining planetary theories and eliminating non-uniform motions through the use of minor epicycles. While his technical contributions were significant, they did not fundamentally alter common astronomical practices of his time.12

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3 Britannica Sources
  1. mathematics - Islamic mathematics to the 15th century
  2. al-Battānī
  3. astronomy - The Islamic world

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