World Metrology Day

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Event

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History and politics

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What Wikipedia says

World Metrology Day is an event occurring on 20 May celebrating the International System of Units. The date is the anniversary of the signing of the Metre Convention in 1875. Metrology is the study of measurement.

Excerpt from the Wikipedia article “World Metrology Day”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dono, CC BY-SA 3.0, via Wikimedia Commons.