2 Time ZonesThe Earth has 24 times zones because it takes the Earth 24 hours to revolve around the sunEach time zone is one hour apartEach time zone is 15 longitude360 / 24 = 15Every place within a time zone has the same time, referred to as its standard time
3 History of TimezonesStandard time zones were not required prior to the 1800s because it was impossible for people to travel large distances in a short period of timeThe development of rapid railway transportation changed travel dramatically, allowing people to travel large distances quickly
4 History of TimezonesThis caused confusion, since every town set their own clocks by the sunEx: 8:00 in Ottawa would be about 7:45 in TorontoA Canadian engineer same Sir Sandford Flemming proposed a system of standard time zones
5 Canada’s Timezones Canada spans 6 time zones We are in the Eastern Standard Time ZoneIf it is 1:00pm in Ottawa it is the same in all of this time zoneIn 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, as far west as Michigan
7 Global Time Zones The prime meridian is the centre time zone The zone extends 7.5 on either side of the 0 longitudeTime in this zone is called universal time (UT) and the standard time in other zones is compared to itTime 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.
8 Global Time ZonesTime 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, next time zone east is 1:00am.
9 Global Time ZonesSome countries modify time zones (change them from straight lines) for political reasons (for example, it’s more convenient)For example 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 meetFor example St. John's, so it is given half a time zone (1/2 an hour)
11 Daylight Savings TimeMany parts of the world change their time according to the seasonDuring the summer, daylight saving time is used to extend daylight hoursFor example the sun in standard time would set at 8:00pm but when time is in daylight savings it would set at 9:00pm (therefore 1 more hour of daylight)
12 Daylight Savings TimeEnergy is saved and people get to enjoy more of the dayi.e. wake up when light, go to bed when darkIn Canada time is changed to daylight saving on the second Sunday in March and ends the first Sunday of November
13 Set the clocks ahead or back? “Spring ahead, fall back”This year, daylight savings time began on March 13We set the clocks ahead one hourIt will end on November 6We will set the clocks back one hourSo when your alarm goes off at 7am, it will feel like 8am - like getting to sleep in an extra hour!
14 Observe Daylight Savings Time Tried it but gave it upNever used it
15 What’s up with Saskatchewan? 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, so shares the same timezone as ManitobaBut 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