April 2023 Issue [Letter from Boulder]
In Search of Lost Time
by Tom Vanderbilt,
The science of the perfect second
is the author, most recently, of Beginners: The Joy and Transformative Power of Lifelong Learning.
Bureau International des Poids et Mesures Coordinated Universal Time Elizabeth Donley Frequency International Prototype of the Kilogram International System of Units Joint Institute for Laboratory Astrophysics Measurement National Institute of Standards and Technology Simon Newcomb Standard time Standards Time Time measurements U.S. Naval Observatory Units
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