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, so the date has to be adjusted in addition to the hour to get the local date and time. . Since many images and maps cover regions large enough to span more than one time zone, it makes little sense to put the "local" time on an image. Instead, the time that appears on most images is an internationally agreed-upon reference time--namely, the local standard time in Greenwich, England. This reference time was formerly called Greenwich Mean Time (GMT) but is now called Universal Time Coordinates (UTC).
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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. |
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Scanned from a copy from Dan Weinstock's Stereogram original. . Time information Time information What time is it, you ask. But if that was too fast for you, check the United States Naval Observatory Master Clock. Or listen to a "live" broadcast of the USNO Master Clock Voice Announcer. |
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Persons using old editions of the almanacs for historical research should be aware of the previous convention. . Naval Observatory Astronomical Applications Department What is Universal Time. The two terms are often used loosely to refer to time kept on the Greenwich meridian (longitude zero), five hours ahead of Eastern Standard Time. Times given in UT are almost always given in terms of a 24-hour clock. |
A good time site: http://www.informationtimes.com/
