Do NOT Copy Time ZONE Confusion

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Presentation transcript:

Do NOT Copy Time ZONE Confusion Have you ever received a phone call in the ‘middle of the night’ by a relative who forgot that you live in a different time zone?

Why do we need them? Do NOT Copy When it is dark and the middle of the night where you are, at some other place it is the early morning, somewhere else it is lunch time. Don't you think it would be pretty confusing to have it called "midnight" in all those places?

Is it 9:00 am everywhere in the world? Why not? Well because of the rotation of the Earth The Earth makes one complete turn from west to east 360 degrees every 24 hours. It is daylight on the part of the Earth that is turned towards the sun and night on the part that is away from the sun. At 12:00 pm (noon) the sun is directly overhead. But...it would be very confusing if every place had a different time. Eg Ladner 12:00 Delta 12:01, Surrey 12:02. So the Earth was divided into 24 time zones. (why 24? There are 24 hours in a day)

Time zones are measured by lines of longitude How large is each time zone? The Earth rotates 360 degrees every day. Each day has 24 hours. 360 24= 15 degrees. Each time zone is 15 degrees of longitude.

We measure from The Prime Meridian in Greenwich England (Starting point for time) Every 15 0 to the East = +1 Hour Every 150 to the West = - 1 Hour

Remember !!! If you travel east you add time If you travel west you subtract time

Canada has 6 time zones (Remember: Pac Man Can Eat All Newfies) 1) Pacific standard time 2) Mountain 3) Central 4) Eastern 5) Atlantic 6)Newfoundland (Remember: Pac Man Can Eat All Newfies)

Why are the time zones not straight? Because time zones cannot run through populated areas, it would be too confusing. Therefore, time zones often bend around populated areas (Eg. Regina Saskatchewan) Could you imagine living in one time zone, and working in another?

There are two ways to determine time in an area 1) Use the map and count the time zones (1 zone = 1 hour) Or 2) Use Longitude Find the longitude of a city and divide the number by 15: whatever the answer is represents the time difference from Greenwich, England Remember: if it is West longitude, the time will be earlier, if east longitude, the time will be later

What time is it in the locations below It is 12:00 at the Prime Meridian.

4:00 PM If it is 4:00 PM in New York What time will it be in Iowa, Utah, and Oregon?