On This Day October 21, 1983 – The Meter Was Defined As The Distance Light Travels In A Second

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Pete

Pete

Mr. Eighties
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Pete has published a news story:

On This Day October 21, 1983 – The Meter Was Defined As The Distance Light Travels In A Second.

On this day October 21, 1983, scientists officially redefined the meter as the distance light travels in a vacuum during one 299,792,458th of a second. This decision was made at the 17th General Conference on Weights and Measures in Paris and marked a major advancement in scientific precision. The new definition replaced earlier physical standards, anchoring the unit of length to a constant of nature rather than a manmade object.

This change represented a milestone in measurement history...
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