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GEO 793Geography of TorontoLecture 3bInstructor:Dr. Mohammad Manshouri[email protected]1Faculty of ArtsDepartment of Geographyand Environmental Studies
International Date LineInternational DateLineisapproximatelyalong the 180thmeridian (180°E or180°W, 180°E =180°W).2
Each time zone isapproximately 15˚of longitude widebecause 360˚divided by 24 (hoursin a day) equals 15˚.Actual boundariesvary from precisemeridians toaccommodatepolitical and culturaldifferences.3Longitude and time zones
Modern International Standard Time Zones4
Modern International Standard Time Zones24 time zonesEarth revolves 360°/24 hours = 15°/hourEach time zone is 15° oflongitude5
The Reality of Time Zones6
7Each time zone has 15˚ longitude in betweenThe Earth rotates once around every 24 hours (360 degrees / 24 hours)Standard Time was invented by a Canadian in 1884 (Sir Sandford Fleming)Prime Meridian is the Centre (7.5 degrees of longitude to each side)Earth rotates from west to east

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