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# Chapter 2:2 Views of Earth- Viewpoints

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Latitude, Longitude, Timezones

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### Chapter 2:2 Views of Earth- Viewpoints

1. 2. Chapter: Views of Earth Table of Contents Section 3: Maps Section 1: Landforms Section 2: Viewpoints
2. 3. Latitude and Longitude —Latitude <ul><li>The equator is an imaginary line around Earth exactly halfway between the north and south poles. </li></ul><ul><li>Lines running parallel to the equator are called lines of latitude , or parallels . </li></ul><ul><li>Latitude is the distance, measured in degrees , either north or south of the equator . </li></ul>Viewpoints 2
3. 4. Latitude and Longitude —Latitude <ul><li>The equator is at 0° latitude , and the poles are each at 90° latitude . </li></ul><ul><li>Locations north and south of the equator are referred to by degrees north latitude and degrees south latitude, respectively. </li></ul>Viewpoints 2
4. 5. Longitude <ul><li>These vertical lines have two names — meridians and lines of longitude . </li></ul><ul><li>Just as the equator is used as a reference point for lines of latitude, there’s a reference point for lines of longitude— the prime meridian . </li></ul>Viewpoints 2 <ul><li>This imaginary line represents 0° longitude. </li></ul>
5. 6. Longitude <ul><li>Longitude refers to distances in degrees east or west of the prime meridian . </li></ul>Viewpoints 2 <ul><li>Points west of the prime meridian have west longitude measured from 0° to 180°, and points east of the prime meridian have east longitude, measured similarly. </li></ul>
6. 7. Prime Meridian <ul><li>The prime meridian does not circle Earth as the equator does. </li></ul>Viewpoints 2 <ul><li>Rather, it runs from the north pole through Greenwich, England , to the south pole. </li></ul><ul><li>The line of longitude on the opposite side of Earth from the prime meridian is the 180° meridian. </li></ul>
7. 8. Prime Meridian <ul><li>You can locate places accurately using latitude and longitude. </li></ul>Viewpoints 2 <ul><li>Note that latitude position always comes first when a location is given. </li></ul>
8. 9. Time Zones <ul><li>Time is measured by tracking Earth’s movement in relation to the Sun. </li></ul>Viewpoints 2 <ul><li>Each day has 24 h, so Earth is divided into </li></ul>24 time zones. Each time zone is about 15° of longitude wide.
9. 10. Calendar Dates <ul><li>In each time zone, one day ends and the next begins at midnight. </li></ul>Viewpoints 2 <ul><li>If it is 11:59 P.M. Tuesday, then 2 min later it will be 12:01 A.M. Wednesday in that particular time zone. </li></ul>
10. 11. International Date Line <ul><li>You gain or lose time when you enter a new time zone. </li></ul>Viewpoints 2 <ul><li>The International Date Line is the transition line </li></ul>for calendar days.
11. 12. International Date Line Viewpoints 2 <ul><li>If you were traveling west across the International Date Line, located near the 180 ° meridian , you would move your calendar </li></ul>forward one day. Traveling east, (against the sun) you would move your calendar back one day.
12. 13. Section Check 2 Question 1 The imaginary line representing 0º longitude is the ________. A. equator B. International Date Line C. prime meridian D. time zone transition line
13. 14. Section Check 2 Answer The answer is C . This line was chosen by astronomers in 1884 .
14. 15. Section Check 2 Question 2 What imaginary line separates Earth into the northern and southern hemispheres? A. equator B. International Date Line C. prime meridian D. time zone transition line
15. 16. Section Check 2 Answer The answer is A. The equator is at 0º latitude, and the poles are each at 90º latitude.
16. 17. Section Check 2 Question 3 What location is nearest to the transition line for calendar days? A. 0º latitude B. 0º longitude C. 180º latitude D. 180º meridian
17. 18. Section Check 2 Answer The answer is D. The International Date Line is located near the 180º meridian.