The 11th issue of the “Almanac of Modern Metrology” is devoted to the fiftieth anniversary of the approval of the standard of time and frequency and its registration in the State Register of Standards under №1. This is an epoch-making event that opened the era of the calculus of atomic time in the country.
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Almanac of Modern Metrology, no 10 is essentially a continuation of one of previous issues of the journal (No 8), which was dedicated to time and frequency measurements — the most required field of metrological research.
Both editions were prepared based on materials of a first class of the Research and Educational Centre of VNIIFTRI under the professional development program for metrologists.
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The articles covering research in the field of time-and-frequency and coordinate-time measurements are represented in most works that determine the theme of the next issue of the Al’manac of Modern Metrology no 9 (the first issue in 2017). 
The first part of the Al’manac attracts considerable attention to fundamental research of aspects of the space metrology, gravitational, gravimetrical and frequency-and-time measurements. The works deal with the direct detection of the gravitational waves, investigation of relativistic synchronization methods for ground and onboard atomic clocks; synchronization and comparison of the time scale.
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