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Naval Observatory, Washington, DC Time Service Dept. . Web page can provide official information on world time zones because nations are sovereign powers that can and do change their timekeeping systems as they see fit. The information here is provided for general interest purposes only. law on standard time zones Time Zones Explanation by F.

Because some countries, islands and states do not want to be divided into several zones, the zones' boundaries tend to wander considerably from straight north-south lines. . World Time Scales home AncientCalendars EarlyClocks Revolution inTimekeeping The"Atomic Age" World TimeScales NIST TimeCalibration World Time Scales In the 1840s a Greenwich standard time for all of England, Scotland, and Wales was established, replacing several "local time" systems. The Royal Greenwich Observatory was the focal point for this development because it had played such a key role in marine navigation based upon accurate timekeeping. Greenwich Mean Time (GMT) subsequently evolved as the official time reference for the world and served that purpose until 1972.

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another time site: http://www.desk.nl/~nettime/

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