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

## Presentation on theme: "Objectives Differentiate between Mercator, Robinson and Conic map projections. 4- Calculate time and date in different time zones."— Presentation transcript:

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

Map Projections Projections Image of the Earth projected on paper

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

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

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

Why Time Zones? video

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

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

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

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