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International time zones

International time zones. The zones are approximately 15º wide and are 1 hour apart. (They do vary from country to country. For example Australian Central Standard Time is GMT + 9½h rather than GMT +9h. New Zealand is in 1 time zone GMT +12h rather than the two it “should” be in)

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International time zones

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  1. International time zones The zones are approximately 15º wide and are 1 hour apart. (They do vary from country to country. For example Australian Central Standard Time is GMT + 9½h rather than GMT +9h. New Zealand is in 1 time zone GMT +12h rather than the two it “should” be in) The International Date Line, IDL, is approximately opposite Greenwich, but it is not a straight line. The line deviates through the pacific and between the USA and USSR. During daylight saving clocks are moved forward by 1 hour.

  2. Example 1 Eliza leaves Sydney (GMT +10h) at 9am and flies to Perth (GMT +8h). If the flight takes 5½h, what is the local time when she lands? Steps: 1) Work out the time difference between the 2 locations 2) Work out the local time at the destination 3) Add the time of flight to find the local landing time As the 2 cities are on of the Greenwich meridian to find the time difference. the same side subtract 1000  0800 = 0200 As Perth is of Sydney the time difference. west subtract 0900  0200 = 0700 Add the time of flight 0700 + 0530 = Eliza lands at 12:30pm Perth time. 1230

  3. Example 2 Tim leaves Buenos Aires (GMT 3h) at 7pm Friday and flies to Dacca (GMT +6h). If the flight takes 14h, what is the local time when he lands? 1) Work out the time difference between the 2 locations 2) Work out the local time at the destination 3) Add the time of flight to find the local landing time As the 2 cities are on of the Greenwich meridian to find the time difference. different sides add 0900 0300 + 0600 = As Dacca is of Buenos Aires the time difference. east add 1900 + 0900 = 2800 = 0400 Saturday Add the time of flight 0400 + 1400 = Tim lands at 6pm Saturday Dacca time 1800

  4. Example 3 Imogen leaves Reykjavik (GMT 1h) at 4am Monday and flies to Anchorage (GMT 9h). If the flight takes 11½h, what is the local time when she lands if Anchorage is using daylight saving time? 1) Work out the time difference between the 2 locations 2) Work out the local time at the destination 3) Add the time of flight to find the local landing time 4) Add time for daylight saving As the 2 cities are on of the Greenwich meridian to find the time difference. the same side subtract 0900  0100 = 0800 As Anchorage is of Reykjavik the time difference. west subtract 0400  0800 = 0400 = 2000 Sunday Add the time of flight 2000 + 1130 = 3130 = 0730 Monday Add 1h for daylight saving 0730 + 0100 = 0830 Alisha lands at 8:30am Monday Anchorage time.

  5. Today’s work Exercise 7-05 Page 270 → 272 Q1 → 4, 10, 13, 14 & 21 Just for fun Q16, 17, 19 & 22 Friday’s work Exercise 7-04 Page 265 → 266 Q1 → 5, 7 → 10, 12 → 15 & 17

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