The Earth rotates in a clockwise direction. Thus, the sun appears to rise in the East and set in the West. The Earth has 24 times zones because it takes the Earth 24 hours to revolve around the sun Each time zone is one hour apart Each time zone is 15 longitude 360 / 24 = 15 As a result there are 24 one hour time standard zones Every place within a time zone has the same time, referred to as its “standard time”
Standard time zones were not required prior to the 1800s because it was impossible for people to travel large distances in a short period of time. The development of rapid railway transportation changed travel dramatically, allowing people to travel large distances quickly.
This caused confusion, since every town set their own clocks by the sun e.g. 8:00 in Ottawa would be about 7:45 in Toronto A Canadian engineer named Sir Sandford Fleming proposed a system of standard time zones. This relied on a consistent system of latitude and longitude.
The Prime Meridian is the centre time zone The zone extends 7.5 on either side of the 0 longitude Time in this zone is called Universal Time (UT) and the standard time in other zones is compared to it
Time zones west of the prime meridian are earlier than the universal time (the time at the prime meridian) e.g. If UT is 12:00am, next time zone west is 11:00pm. Time zones east of the prime meridian are later than the universal time (the time at the prime meridian) e.g. If UT is 12:00am, the next time zone east is 1:00am.
Flip over to the back of your page to label the time zones. Where it says “Hours Ahead of GMT” that means Greenwich Mean Time. Use the UTC number for this. Canada spans 6 time zones: Pacific, Mountain, Central, Eastern, Atlantic and Newfoundland We are in the Eastern Standard Time Zone If it is 1:00pm in Kingston, it is the same in the entire Eastern time zone In Canada, this includes all of Quebec and most of Ontario (as far west as Thunder Bay) In the US, this includes all of the eastern states and as far west as Michigan
As you will see on the next slide, Some countries modify time zones (change them from straight lines) for political reasons e.g. All of China is in same time zone, so all of the country is on the same time. Some places are located where time zones meet For example St. John's, so it is given half a time zone (1/2 an hour) Interactive Map Interactive Map
Many parts of the world change their time according to the season During the summer, daylight savings time is used to extend daylight hours For example, the sun in standard time would set at 8:00pm. When time is in daylight savings, it would set at 9:00pm (therefore 1 more hour of daylight)
Why do we do this? Energy is saved and people get to enjoy more of the day i.e. wake up when light, go to bed when dark In Canada, Daylight Savings begins on the second Sunday in March and ends the first Sunday of November
“Spring ahead, fall back” This year, daylight savings time began on Sunday, March 9 This year, We set the clocks ahead one hour It will end on Sunday, November 2 We will set the clocks back one hour
Observe Daylight Savings TimeTried it but gave it up Never used it
Saskatchewan is naturally located within the Mountain Standard Time (MST) – the same timezone as Alberta. Under The Time Act of 1966, Saskatchewan adopted Central Standard Time, and began sharing the same timezone as Manitoba Since they don’t observe Daylight Savings Time, they share the same time as Alberta during the summer months and the same time as Manitoba during the winter months
The issue has been hotly debated in Saskatchewan since 1966 when the Time Act was introduced. Some farmers fear that shifting the clocks would disrupt feeding and milking schedules for animals. They are also not happy about the prospect of having their children wait in the cold pre-dawn of a Saskatchewan winter for the school bus. Businesses have long pushed for the change to standardize their operations.