The Master Clock's modest appearance is deceiving: this remarkable machine "talks" to the USNO's other clocks, and constantly corrects itself to best reflect their collective timekeeping output. And it does so with staggering precision. It keeps time to within one hundred picoseconds - one hundred trillionths of a second — over the course of each day, every day. Had it been set when the dinosaurs went extinct, 60 million years ago, it would have gained or lost no more than about two seconds.
I glance at my watch. One of us is off by fifty seconds. I'm guessing it's me.
– Dan Falk (1966), Canadian science journalist, broadcaster, and author. In Search of Time: The Science of a Curious Dimension (2008). [USNO stands for United States Naval Observatory.]
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