International Time Zones

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Presentation transcript:

International Time Zones

Longitude and Time Zones There are 24 time zones, with 1 hour difference between them. Each time zone is 15 degrees (360/24 = 15) Every place within a zone has the same time = standard time It was developed by Sir Sandford Flemming, a Scottish Born Canadian.

Prime Meridian Centre of time zones, 0 degrees longitude This is called ‘Greenwich Time (GMT) and all others are compared to it. WEST of the Prime Meridian, zones are behind time (subtract); Toronto is 5 zones to the west of GMT so we are 5 hours behind GMT EAST of the Prime Meridian, zones are ahead of time (add); Moscow is 2 zones to the west, therefore they are 2 hours ahead of GMT Countries may modify the zones for political reasons

International Date LIne A longitudinal line that follows the 180 degree line through the Pacific Ocean, therefore not passing through any major land masses. If you cross it moving westward, you add a day If you cross it moving eastward, you lose a day

Daylight savings Countries change time according to the season (fall - back, spring - forward) During the summer ‘Daylight Savings’ is used to extend the daylight hours into the evening when most people are awake. Not all countries use Daylight Savings Movie Trailer

Videos International Time Zones Jet Lag