Among the areas of application made practicable by the advent of atomic clocks we list the following:
Space Science: Long-distance tracking and data acquisition from “deep” space probes such as Voyager.
Radio Astronomy: Very long baseline interferometry (VLBI), made possible through a common phase reference.
Planetary Motion: The dynamics of the Earth as a planet and the variability of the length of the day.
Radio Navigation: Perhaps the most useful application. Land-based networks Loran-C and Omega, and the satellite-based systems the TRANSIT system, culminating in the NAVSTAR Global Positioning System (GPS) and GLONASS.
KeywordsGlobal Position System Global Navigation Satellite System Global Navigation Satellite System Very Long Baseline Interferometry Satellite Clock
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