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“Aryabhatiya Golapada IV.9 uses the boat analogy to argue that the apparent westward motion of stars is an illusion caused by Earth's eastward axial rotation. Aryabhatiya I.1 quantifies it: 1,582,237,500 rotations per yuga ≈ 366.26 sidereal rotations per year, accurate to ~4 parts per million against modern measurement. Predates Copernicus by 1,044 years; contested within Indian astronomy itself (Brahmagupta rejected it in 628 CE). ”