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Time measurements -- History

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NIST: A Walk Through Time

Sometimes it flies, sometimes it marches on, and sometimes it seems to stands still. Regardless of its speed, time has always been measured in some fashion, and the National Institute of Standards and Technology has an informative online presentation of the evolution of time measurement throughout the ages. Visitors will learn in the first three sections that calendars were the first...

https://www.nist.gov/pml/time-and-frequency-division/popular...