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The International Date Line
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The International Date LineWhen sailors first sailed around the world, they returned home either a day ahead or a day behind those people who stayed. To correct this situation, the International Date Line was established. The International Date Line was arbitrarily chosen to separate one day from the next. It has a very convenient location, being in an unpopulated area of the world – the Pacific Ocean. It runs between the North and South Pole, and generally follows the 180° line of longitude through the Pacific Ocean. It zigzags, however, to avoid dividing land masses or island groups that belong to the same country. It is generally a full 180° east or west of the Prime Meridian, on the opposite side of the globe. If you cross the date line moving westward, you add a day. If you cross the date line moving eastward, you lose a day. The time does not change unless the date line corresponds to a time zone boundary. West of the International Date Line is one day later than to the east of the line. Consequently, someone who flies from Vancouver to Hong Kong may leave in the evening of Sunday and arrive on Tuesday morning, after a 13-hour flight, having “missed” Monday1 The reverse is true on the 13-hour return flight: having left Hong Kong on Monday evening, the flight arrives in Vancouver on Monday morning just in time for the passengers to enjoy Monday morning all over again. The International Date Line just like the Prime Meridian runs through the middle of a time zone. 
Daylight-Saving TimeMany parts of the world change their time according to the season. Local standard time can be determined for an area in the world by adding one hour for each time zone counted in an easterly direction from one’s own, or by subtracting one hour for each zone counted in a westerly direction. Occasionally, various countries that are some distance from the equator adjust the time to take advantage of the early rise and late set of the sun, according to the season. We call this practice “daylight saving time.” In Canada, we move the clocks ahead one hour in spring to take advantage of longer evenings. During the summer, daylight-saving time is used to extend daylight hours into the evening when most people are awake. For example, the sun would set at 9 p.m. instead of 8 p.m., thereby cutting down on energy use since lights don’t have to be turned on until later in the day. In fall, we move the clocks back one hour in to provide more daylight hours in the morning. In Canada and the United States, daylight-saving time begins on the first Sunday in April and ends on the last Sunday on October. Other countries use different dates. Time Zone Practice CalculationsQuestion 1: Calculate the time difference, in hours, between each of the following Canadian destinations: (10 points) Charlottetown and Toronto is _____________ Saint John and Saskatoon is _____________ Iqaluit and St. John’s is _____________ Sydney and Moose Jaw is _____________ Ottawa and Yellowknife is _____________ Edmonton and Montreal is _____________ Quebec City and Winnipeg is _____________ Regina and Moncton is _____________ Halifax and Victoria is _____________ Thunder Bay and Kenora is _____________ Question 2: A swim meet is being held next summer in your provincial capital. Swimmers will be attending form Victoria, Brandon, Sault Ste. Marie, Medicine Hat, Saskatoon, Gatineau, Bathurst, Corner Brook, Hamilton and Dawson. You are responsible for indicating the time difference between your community and their community. Each team is expecting to receive this information by telephone at 9:00 a.m. local time. If you are calling from your community, at what time will you have to place each of these calls? Remember to list your local time as a.m. or p.m. (10 points) 9 a.m. local time in Victoria = ________ Bedford Area 9 a.m. local time in Brandon = ________ Bedford Area 9 a.m. local time in Sault Ste. Marie = ________ Bedford Area 9 a.m. local time in Medicine Hat = ________ Bedford Area 9 a.m. local time in Saskatoon = ________ Bedford Area 9 a.m. local time in Gatineau = ________ Bedford Area 9 a.m. local time in Bathurst = ________ Bedford Area 9 a.m. local time in Corner Brook = ________ Bedford Area 9 a.m. local time in Hamilton = ________ Bedford Area 9 a.m. local time in Dawson = ________ Bedford Area Time Zone Calculations ChartDirections: All the information that you need to compete the time zone calculations can be found in the chart below. (10 points)
Please Note: The time it takes to travel between two places is called the time distance. To calculate the time distance you must add the total travel time. Download 209.83 Kb. Share with your friends:
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