PowerPoint Presentation
International Time ZonesKey Terms & Points to Remember:Prime
Meridian the 0 line of longitude that passes through Greenwich in
London. It runs from the North Pole to the South Pole and is called
the Greenwich Meridian.Greenwich Mean Time (GMT) What is it?When
the sun is directly over the prime meridian, the time is 12 noon
GMT. All other time zones are measured from this.International Date
Line - the 180 line of longitude that runs from the North Pole to
the South Pole on the opposite side of the globe to the Greenwich
Meridian.What is the significance of the International Date
Line?When travelling east, if you cross the International Date
Line, you move into a new time zone and into the previous day on
the calendar.Time Zones the Earth is divided into time zones and
each zone has a difference of approx 1 hour from Greenwich.
The Earths Rotations
To calculate time in different time zones you need to know the
Coordinated Universal Time (UTC) or GMT adjustment for each
zone.
There is a formula that can be followed when calculating the
times in different zones.It is also important to use 24-hour times
in your calculations.To find the correct time zone for a particular
city/country, you need to refer to a World Time Zone Map.
This is an example of a World Time Zone Map sourced from
http://www.igooglemaps.com/gfx/map_of_timezones.jpg
The GMT/UTC is recorded at the bottom of each time zone for
reference.
Example A: If it is 4.30pm in Wellington, New Zealand , what
time is it in Brisbane?
Lets try another example:If it is 3.30PM in San Francisco on
Sunday , what time is it in Brisbane?
This concludes our lesson on International Time Zones
Now try the worksheet, using the link to the Time Zone Map to
work out the GMT values you will need in your calculations.
These can then be checked by accessing the Time Converter Link
Provided on the wiki page.