Search results
Results From The WOW.Com Content Network
The first set of units defined using the caesium standard were those relating to time, with the second being defined in 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom" meaning that: 1 second, s, = 9,192,631,770 Δt Cs
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]
BeiDou Time (BDT) is a continuous time scale starting at 1 January 2006 at 0:00:00 UTC and is synchronised with UTC within 100 ns. [139] [140] BeiDou became operational in China in December 2011, with 10 satellites in use, [141] and began offering services to customers in the Asia-Pacific region in December 2012. [142]
Travelers hoping to visit Hawaii in coming weeks are being asked to avoid West Maui, which has been ravaged by wildfires.
For premium support please call: 800-290-4726 more ways to reach us
Weather is behind nearly two-thirds of flight disruptions According to the Federal Aviation Administration, 63% of flight delays are a result of weather conditions.
The evaluated accuracy u B reports of various primary frequency and time standards are published online by the International Bureau of Weights and Measures (BIPM). In May 2013 the NIST-F1 cesium fountain clock reported a u B of 3.1 × 10 −16. However, that BIPM report and the other recent reports are based on an evaluation that dates to 2005. [4]
For premium support please call: 800-290-4726 more ways to reach us