Below in the world, it could not matter if your watch runs a couple of secs slow-moving. Yet essential spacecraft features require precision to one billionth of a 2nd or much less. Browsing with general practitioner, for instance, relies upon accurate timing signals from satellites to identify places. 3 groups at NASA’s Goddard Area Trip Facility in Greenbelt, Maryland, go to job to press timekeeping for area expedition to brand-new degrees of accuracy.
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