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Time Zones
World Timezone Map
http://uniontrans.com/extras/timezone.htm
- Weather observations are always taken with respect
to time.
- By convention, weather scientists use the twenty-four-hour
clock, and use one time zone, Greenwich Mean
Time (GMT).
- Your email box is full of Greenwich Mean Time
(GMT) references that you probably didn't know
about! Do your emails contain something like this:
- "Tue, 29 Nov 1999 15:20:46 -500 (EST)"
Ever wondered what the "-0500" (or equivalent)
means? It is the time offset from GMT. In this
example, EST (Eastern Standard Time) is 5 hours
behind GMT.
- The U.S space shuttle uses Greenwich Mean Time.
- Greenwich Mean Time is also known as Universal
Time (UTC). To convert to local time, you must
know the time difference between GMT and local
time for both standard time and summertime (daylight
savings time). Not all states (or countries) observe
daylight savings time.
- See http://atm.geo.nsf.gov/ieis/time.html for
a nifty page that will help you convert your local
time to Universal Time.
- The U.S. has 7 times zones: Atlantic, Eastern,
Central, Mountain, Pacific, Alaska, and Hawaii.
- There is no "official" information
on world time zones because nations are sovereign
powers that can and do change their timekeeping
systems as they see fit.
- That having been said, see http://aa.usno.navy.mil/AA/faq/docs/world_tzones.html
for a reasonably up-to-date world time zones
map.
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