Solar time, legal time, time in use

@article{Guinot2011SolarTL,
  title={Solar time, legal time, time in use},
  author={Bernard R. Guinot},
  journal={Metrologia},
  year={2011},
  volume={48},
  pages={S181 - S185}
}
  • B. Guinot
  • Published 1 August 2011
  • Physics
  • Metrologia
The International Conference held in 1884 at Washington defined a universal time as the mean solar time at the Greenwich meridian (GMT). Now, the Universal Time, version UT1, is strictly defined as proportional to the angle of rotation of the Earth in space. In this evolution, the departure of UT1 from GMT does not exceed one or two seconds. This is quite negligible when compared with the departure between the solar time and the legal time of citizens, which may exceed two hours without raising… 

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The construction, operation, and testing of the standard are described. The resonance employed is that due to the hyperfine splitting of caesium, having a frequency of approximately 9192 Mc/s. The