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Home › Magazines › 2007 › January › Time Measurement using Atomic Clocks

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Time Measurement using Atomic Clocks

The Quest for Accuracy

Published in issue 361, January 2007

Time Measurement using Atomic Clocks
Of all nature’s physical quantities it is time that we know how to measure best. The most advanced atomic clocks are breathtakingly accurate, many millions of times more so than the best quartz-based clocks. How do they manage it?

Relevant websites

www.npl.co.uk/time/
en.wikipedia.org/wiki/Pendulum_clock
en.wikipedia.org/wiki/Escapement#Free_pendulum_clock
www.rohde-schwarz.com
www.elektor.com/Default.aspx?tabid=27&art=52974
www.ptb.de/de/org/4/44/_index.htm
www.npl.co.uk/reference/time.html" target="_blank">www.npl.co.uk/reference/time.html
www.npl.co.uk/reference/
www.npl.co.uk/reference/electric_current.html
en.wikipedia.org/wiki/DCF77
www.symmetricom.com
ftp://tycho.usno.navy.mil/pub/gps/gpsb2.txt
www.kowoma.de/en/gps/positioning.htm
www.deutsches-uhrenmuseum.de/default.asp?id=1&setLanguage=eng

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