Since the atomic clock is updated at least once each day, any error would be measured in fractions of a second, and the display would still appear to be on the correct second.Īll content on the WeatherShack Education Center is Copyright 2002-2020. Atomic clocks keep time between synchronization using their quartz crystal oscillators, typically accurate to within one second over several days. ![]() Those that decode once per day usually do it at night, when the synchronization signal from WWVB is much stronger. Some radio controlled clocks only decode the signal once per day, others more often. Once the atomic radio controlled clock has been synchronized, it won’t decode the WWVB atomic digital clock signal again for awhile. While some users want their atomic clocks to display UTC (amateur radio operators, for example), most users prefer to display local time. Consequently, when the atomic radio controlled clock has decoded the WWVB atomic digital clock signal, it will first apply a time zone correction based on the time zone the atomic clock is set to, and then synchronize itself to the information received from WWVB. Zero hours UTC (0000) is midnight in Greenwich England, which lies on the zero longitudinal meridian. It is the current term for what was once commonly referred to as Greenwich Mean Time (GMT). WWVB broadcasts its atomic digital clock information using Coordinated Universal Time (UTC), the international time standard.
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