Frequently asked questions (FAQ) index 
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How to get the time using a telephone, computer or radio signals.
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Descriptions and uses of radio signals from WWV, WWVB and WWVH.
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How is UTC(NIST) related to Coordinated Universal Time (UTC)
International Atomic Time (TAI), Greenwich Mean Time (GMT)
USNO time, GPS time and Zulu time?
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Daylight saving time rules, exceptions and legislation.
Time zones, borders, abbreviations and relationship to U.S. postal zip codes.
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What leap seconds are, how they are implemented and their future.
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How clocks work.
Cesium clocks, why we need precise time and frequency.
Stopwatch calibrations, calendars and history.
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How to use a.m./p.m. vs. noon/midnight.
Sunrise/sunset times and definitions of dusk/dawn/twilight.
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If you have a question that is not addressed here, let us know.
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