#reform

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Why revolutionary France pursued a common measurement system

Revolutionary France developed the metric system during the 1790s against a background of varied local measures. A common decimal system aimed to make quantities easier to compare across regions. Adoption required new tools, habits and institutions, so creating the units did not make older measures disappear immediately.

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calendars

Why the Gregorian calendar removed dates in 1582

The Gregorian calendar reform of 1582 corrected drift in the Julian calendar's relationship to the solar year. In the first adopting regions, 4 October was followed by 15 October. The reform also adjusted leap-year rules, but countries adopted it at different times rather than changing together worldwide.

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