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Aryabhata's 499 CE declaration that Earth rotates on its axis — a millennium before Copernicus shocked Europe with the same idea
In 499 CE, a 23-year-old named Aryabhata wrote the Aryabhatiya — a treatise that was far ahead of its time in astronomy and mathematics. It contained a bold claim that would not shake European scientists until a thousand years later: the sky does not rotate — the Earth rotates.
"Just as a man in a moving boat sees stationary objects going backward, so too the stationary stars are seen going west at Lanka — it is the Earth that is round and turns eastward."
— Aryabhata, Aryabhatiya, Golapada 9 (499 CE)
This analogy is remarkably modern. Aryabhata used relativistic thinking — apparent motion depends on your frame of reference. This was 1,100 years before Galileo's principle of relativity.