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en.wikipedia.org/wiki/Atomic_clock

An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, ..... numerous optical clock systems are now being developed around the world.

www.time.gov

Also, try the alternate Flash page or see About This Site. Yq_gy"9;. Synchronizing . Yq_gy"9;. Synchronizing. 24-hr. Pacific Time. Pacific Time. Pacific Time.

time.is

7 million locations, 46 languages, synchronized with atomic clock time.

time.is/GMT

Exact time now, time zone, time difference, sunrise/sunset time and key facts for ... Time.is displays exact, official atomic clock time for any time zone (more than 7  ...

www.timeanddate.com/time/international-atomic-time.html

International Atomic Time (TAI) is a time scale that uses the combined output of some 400 highly precise atomic clocks. It provides the exact speed at which our ...

www.timeanddate.com/time/how-do-atomic-clocks-work.html

Atomic clocks are among the most accurate timekeepers in human history. ... Atomic clocks are designed to measure the precise length of a second, the base unit of ... Every now and then a leap second is added to Coordinated Universal Time ...

www.usno.navy.mil/USNO/time/display-clocks/simpletime

US Naval Observatory Master Clock Time: Mon, 20 Nov 2017 00:03:55 UTC. Time Zones: Sun, 19 Nov 2017 19:03:55 EST. Sun, 19 Nov 2017 18:03:55 CST.

tycho.usno.navy.mil/what.html

US Naval Observatory Master Clock. Loading... Animated USNO Time in Standard Time Zones (Requires Javascript be enabled.) USNO Time in Standard Time ...

www.worldtimeserver.com

Are you looking for a free clock for your own web site or blog? ... Every time zone is represented, but instead of limiting our time data to a ..... Atomic Clock Sync