Time zones
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Time Zones. The earth has 24 hours in a day, and 24 different time zones. All area within a time zone is the same from the north pole to the south pole. Each is based on 15 o of longitude. When you go east, you go ahead an hour per zone. W E - +. A. B. C. D. E. F.

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Time zones

Time Zones

The earth has 24 hours in a day, and 24 different time zones.



  • Each is based on 15 to the south pole.o of longitude.

  • When you go east, you go ahead an hour per zone.W E

    - +

A

B

C

D

E

F

20o E 35o E 50o E 65 o E 80o E 95o E


Canada s time zones
Canada’s Time Zones to the south pole.

Canada stretches almost 90o from east to west.

How many time zones do we have?


Canada s time zones1
Canada’s Time Zones to the south pole.

Find the six different blue colours-one per zone. (Ignore yellow and dark purple).

The lines of longitude have been adjusted. Why?


Why countries adjust their time zone boundary lines
Why countries adjust their time zone boundary lines to the south pole.

  • To avoid passing through a city

  • To go around physical features such as a mountain that naturally divide an area

  • To make all of a province be in the same time zone


World time zones
World Time Zones to the south pole.


Daylight savings
Daylight Savings to the south pole.

  • advance clocks one hour so that afternoons have more daylight and mornings have less

  • clocks are adjusted forward one hour in spring and are adjusted backward in fall.

  • modern daylight savings time (DST) was first proposed in 1907


Dst pros and cons
DST- Pros and Cons to the south pole.

  • adds daylight to afternoons benefits retailing, sports, and other activities that use sunlight after working hours,

  • causes problems for farming, entertainment and other occupations tied to the sun because less light in the morning

  • an early goal was to reduce evening usage of electric power for lighting

  • complicates timekeeping and can disrupt meetings, travel, recordkeeping, medical devices


(blue) DST used      

(orange) DST no longer used      

(red) DST never used


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