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Objectives 3-4 3- Differentiate between Mercator, Robinson and Conic map projections. 3- Differentiate between Mercator, Robinson and Conic map projections.

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Presentation on theme: "Objectives 3-4 3- Differentiate between Mercator, Robinson and Conic map projections. 3- Differentiate between Mercator, Robinson and Conic map projections."— Presentation transcript:

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2 Objectives Differentiate between Mercator, Robinson and Conic map projections. 3- Differentiate between Mercator, Robinson and Conic map projections. 4- Calculate time and date in different time zones 4- Calculate time and date in different time zones

3 Map Projections Projections Projections Image of the Earth projected on paper Image of the Earth projected on paper

4 Map Projections: Mercator Lat. & long. lines parallel Lat. & long. lines parallel Covers large area (global) Covers large area (global) Distortion at the poles Distortion at the poles

5 Map Projections: Robinson Accurate continental shapes Accurate continental shapes Lines of lat. are parallel Lines of lat. are parallel Lines of long. are curved Lines of long. are curved Less distortion near poles Less distortion near poles

6 Map Projections: Conic Accurate for certain latitudes Accurate for certain latitudes Distortion at poles and equator Distortion at poles and equator Usually covers a small area Usually covers a small area

7 Why Time Zones? video video

8 Why do we have time zones? Earth rotates once every 24 hours Earth rotates once every 24 hours West to east West to east

9 Why do we have time zones? Divide earth into 24 time zones (25) Divide earth into 24 time zones (25) Each unit is 15 o wide Each unit is 15 o wide = 1hr time change = 1hr time change Eastward advance hour Eastward advance hour Westward subtract hour Westward subtract hour

10 Rules for Changing Date Date changes when crossing International Date Line Date changes when crossing International Date Line Cross westward = advance a day Cross westward = advance a day Cross eastward = go back a day Cross eastward = go back a day Day must change at midnight Day must change at midnight


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