Gabriel Mouton

French mathematician

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July 1, 2026

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Gabriel Mouton was a French mathematician and astronomer who, in 1670, proposed a system that closely resembled the eventual metric system. His proposal was based on the arc of one minute of longitude and featured decimal subdivisions, rational prefixes, and a basis for definition derived from the Earth's measurement.1

While Mouton's ideas were discussed for over a century, they significantly influenced the development of the metric system, which was officially established in France during the French Revolution. The metric system's core principles of decimalization and a rational basis for measurement were foundational to its widespread adoption.1

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measurement system
The development and establishment of the metric system
Gabriel Mouton, the vicar of St. Paul’s Church in Lyon, France, and a noted mathematician and astronomer, suggested a linear measure based on the arc of one minute of longitude, to be subdivided decimally. Mouton’s proposal contained three of the major characteristics of the metric…
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Gabriel Mouton, the vicar of St. Paul’s Church in Lyon, France, and a noted mathematician and astronomer, suggested a linear measure based on the arc of one minute of longitude, to be subdivided decimally. Mouton’s proposal contained three of the major characteristics of the metric…
Read More