The First Definition of the Metre: A 230-Year History

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science

13 August 2026 at 5:44 pm

The First Definition of the Metre: A 230-Year History

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Summary

August 1st marks the 230th anniversary of the metre's first definition by the French National Assembly in 1793, which affirmed the decimal system and the meridianal definition, though its definition has evolved multiple times since.

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