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The 2025, 10 Euro Silver Proof Coin “Great Minds of Old: Eratosthenes” honors one of the most remarkable scholars of the ancient world. Eratosthenes, renowned for calculating the circumference of the Earth with remarkable accuracy in the 3rd century BC, was a mathematician, astronomer, geographer, and philosopher whose work shaped early scientific understanding. As part of the “Great Minds of Old” series, the coin celebrates the intellectual achievements of humanity’s greatest thinkers and their lasting contributions to science and knowledge.