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NIST-F1, source of the official time of the United States. 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 and frequency standard. The clock took fewer than four years to test and build, and was developed ...
Location Image CS1 [1] ... Boulder, Colorado United States [8] NIST-F2 [9] Cs fountain 1.1 ... 18 cesium atomic clocks and 4 hydrogen maser clocks
The high frequency of caesium allows for more accurate measurements. Caesium reference tubes suitable for national standards currently last about seven years and cost about US$35,000. Primary frequency and time standards like the United States Time Standard atomic clocks, NIST-F1 and NIST-F2, use far higher power. [34] [70] [71] [72]
WWVB's Colorado location makes the signal weakest on the U.S. east coast, where urban density also produces considerable interference. In 2009, NIST raised the possibility of adding a second time code transmitter, on the east coast, to improve signal reception there and provide a certain amount of robustness to the overall system should weather or other causes render one transmitter site ...
NIST physicists Steve Jefferts (foreground) and Tom Heavner with the NIST-F2 cesium fountain atomic clock, a civilian time standard for the United States. NIST-F2 is a caesium fountain atomic clock that, along with NIST-F1, serves as the United States' primary time and frequency standard. [1] NIST-F2 was brought online on 3 April 2014. [1] [2]
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The US service is provided by radio stations WWV (Colorado) and WWVH (Hawaii). The methods below provide either Coordinated Universal Time (UTC), which is defined by Recommendation ITU-R TF.460 , [ 3 ] or the official U.S. implementation of UTC, officially labeled UTC (NIST).
GPS time (atomic clock) 21:47: Speed unit: Kilometers per hour: Speed of GPS receiver: 0: Reference for direction of image: True direction: Direction of image: 273.83503749148: Reference for bearing of destination: True direction: Bearing of destination: 273.83503749148: GPS date: 11 January 2019