[DOC] [TLE] The Official NIST US Time: [PAR] Public service cooperatively provided by the National Institute of Standards and 
Technology (NIST) and U.S. Naval Observatory (USNO). Clickable map of U.S.... [DOC] [TLE] National Institute of Standards and Technology - Wikipedia [PAR] The National Institute of Standards and Technology (NIST) is a measurement 
standards ... Promote U.S. innovation and industrial competitiveness by 
advancing measurement .... NIST's Boulder laboratories are best known for NIST
F1, which houses an atomic clock. NISTF1 serves as the source of the nation's 
official time. [DOC] [TLE] Atomic clock - Wikipedia [PAR] An example of this is the NIST-F1 atomic clock, one of the national primary time 
and frequency standards of the United States. The accuracy of an atomic clock... [DOC] [TLE] NIST-F1 - Wikipedia [PAR] NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute 
of Standards and Technology (NIST) in Boulder, Colorado, and serves as the 
United States' primary time... [DOC] [TLE] How the US Built the World's Most Ridiculously Accurate Atomic Clock [PAR] Apr 4, 2014 ... The U.S. has introduced a new atomic clock that is three times more accurate 
than previous devices. ... On Apr. 3, the National Institute of Standards and 
Technology (NIST) in Boulder, Colorado officially launched their ... This means 
they determine the length of a second by measuring a natural vibration... [DOC] [TLE] How the Master Clock Sets Time For The World | Motherboard [PAR] Nov 6, 2014 ... "U.S. Naval Observatory Master Clock," a voice would announce, in a full ... TV 
actor Fred Covington, whose IMDB entry includes the Master Clock.) .... Both 
USNO and NIST also transfer time by satellite to military and ... Scientists already 
knew that atomic time was far more stable than time determined by... [DOC] [TLE] Understanding Time and Frequency - Time and Frequency Division [PAR] From. Sundials'. TO. Atomic Clocks. Understanding. Time and. Frequency i. 
James Jespersen ... National Institute of Standards and Technology, Monograph 
155,1999 Edition. Natl. ... For sale by the Superintendent of Documents, US. .... 
items, digital messages routinely travel between cities and nations by 
communication. [DOC] [TLE] The most accurate clock in the world: New American atomic... [PAR] Apr 4, 2014 ... New clock is three times more accurate than previous atomic clocks; Uses '
fountain' of ... Both clocks use a 'fountain' of cesium atoms to determine the exact 
length of a second. ... Some atomsthose whose energy states were altered by 
the ... NIST-F2 is the latest in a series of cesium-based atomic clocks... [DOC] [TLE] National Institute of Standards and Technology - Department of ... [PAR] capabilities to the U.S. research community, and the NIST Center for ... 
infrastructures, 21st century defense capabilities, secure and resilient smart-city 
infrastructures, .... Building 1 of the NIST Boulder, Colorado laboratories, which 
houses the majority ..... development of laser-cooled atomic clocks, advances in 
experimental... [DOC] [TLE] Einstein's theory is proved - and it is bad news if you own a ... [PAR] Sep 23, 2010 ... Scientists use atomic clocks to show that time moves faster at altitude, even on 
Earth ... the US National Institute of Standards and Technology in Boulder, 
Colorado, found that when they monitored two such clocks positioned just a .... 
My Glasgow: food writer Sumayya Usmani on her love affair with the city... [DOC] [TLE] The SIM Time Network - NCBI - National Institutes of Health [PAR] Apr 1, 2011 ... National Institute of Standards and Technology (NIST), Boulder, CO 80305, USA 
... Centro Nacional de Metrologia de Panama (CENAMEP), Panama City, 
Panama ... The SIMTN continuously compares the time standards of SIM NMIs ... 
Metrologa (CENAM) of Mexico, NRC, and NIST of the United States. [DOC] [TLE] What Happens If GPS Fails? - The Atlantic [PAR] Jun 13, 2016 ... Despite massive reliance on the system's clocks, there's still no ... plus the U.S. 
has several spares) has multiple

Question: Time in the U.S. is determined by the National Institute of Standards & Technology whose atomic clock is in this Colorado city
Answer: Boulder