Social Studies 9 Chapter 2 Time Zones

Time Zones

 A time zone is a region of the Earth that has adopted the same standard time , usually referred to as the local

time

 Most adjacent time zones are exactly one hour apart  It is based on the earth’s rotation from west to east every 24h

 The earth passes through 360º = 15º for each hour (360/24=15)  Sometimes we have irregularly-

shaped zones that follow political boundaries (eg. NL time half hour difference) or that change

their time seasonally (as with daylight saving time )

    The (1

(GMT)

st )first Time zone starts at the Prime Meridian (0º longitude) and is called Greenwich Mean Time Time zones west of 0º are 1 hour earlier Time zones east of 0º are 1 hour later The two sides meet at 180º, this forms the International Date Line

– at this point the date changes either one day ahead or one day back

 http://wwp.greenwichmeantime.com

/info/timezone.htm

 http://aa.usno.navy.mil/faq/docs/wo rld_tzones.php

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