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Longitude and Latitude


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Longitude and Latitude

  1. 1. Understanding Longitude and Latitude 1Mr Thompson – Earth Science
  2. 2. Typical Graph This is an example of a typical graph we are all familiar with The graph is made up of different “points” with lines that connect the points 2Mr Thompson – Earth Science
  3. 3. Typical Graph Y axis Each point has two values: The “X” value that runs along the horizontal “X” axis The “Y” value that runs along the X axis vertical “Y” axis 3Mr Thompson – Earth Science
  4. 4. Y (3,8) Typical Graph (9,5) X value is always X (0,0) 4Mr Thompson – Earth Science
  5. 5. A point can also have Typical Graph negative (-) values Y Negative X values (0,0) are to the left of the (-X, origin (0,0) +Y) (+X,+Y) X Negative Y values are (-X,-Y) (+X,-Y) below the origin 5Mr Thompson – Earth Science
  6. 6. A point can also have Typical Graph negative Y (-) values (-X,+Y) (+X,+Y) Negative X values are to the left (0,0) of the origin (0,0) (-X,-Y) (+X,-Y) X Negative Y values are below the origin 6Mr Thompson – Earth Science
  7. 7. East West, North Let the X axis be the South on The Equator. Earth Let the Y axis be the Prime Y Meridian that runs through Geeenwich outside of London. X Lat/Long are the 2 grid points by which you can locate any point on earth. 7Mr Thompson – Earth Science
  8. 8. East West, North South on the Earth N Let each of the four quarters then be designated by W E North or South and East or West. S 8Mr Thompson – Earth Science
  9. 9. East West, North South on the Earth The N tells us we’re (N, W) (N, E) north of the Equator. The S tells us we’re south of the Equator. The E tells us that we’re east of the Prime Meridian. The W tells us that we’re west of the (S, W) (S, E) Prime Meridian. 9Mr Thompson – Earth Science
  10. 10. East West, North South on the Earth (N, W) That means all points in North America will have a North latitude and a West longitude because it is North of Prime Meridian the Equator and West of the Prime Meridian. 10Mr Thompson – Earth Science
  11. 11. East West, North South on the Earth What would be the latitude and longitude directions in Australia? Prime Meridian ? If you said South and East , you’re right! 11Mr Thompson – Earth Science
  12. 12. Latitude is the distance from What is Latitude? the equator along the Y axis. 90°N Y All points along the equator have a value of 0 degrees latitude. X North pole = 90°N South pole = 90°S Values are expressed in terms 90°S of degrees. 12Mr Thompson – Earth Science
  13. 13. 90°N Y What is Latitude? Each degree of latitude is divided into X 60 minutes. Each minute is divided into 60 seconds. 90°S This is also true of longitude. 13Mr Thompson – Earth Science
  14. 14. What is Latitude? 90°N For Example: Y 37°, 02’,51’’N X This is close to the latitude 90°S where you live. 14Mr Thompson – Earth Science
  15. 15. What is Longitude? Longitude is the distance Y from the prime meridian along the X axis. All points along the prime X meridian have a value of 0 degrees longitude. The earth is divided into two parts, or hemispheres, of east and 180°W 180°E west longitude. 15Mr Thompson – Earth Science
  16. 16. What is Longitude? Y The earth is divided into 360 equal slices X (meridians) 180 west and 180 east of the prime meridian 180°W 180°E 16Mr Thompson – Earth Science
  17. 17. What is Latitude? 90°N Our latitude and Y longitude might be: X 38.25° N 76.96° W 90°S 17Mr Thompson – Earth Science
  18. 18. So Where is (0,0)? The origin point (0,0) is where the equator intersects the prime meridian. (0,0) is off the western coast of Africa in the Atlantic Ocean. 18Mr Thompson – Earth Science
  19. 19. See If You Can Tell In Which Quarter These Lon/Lats Are Located 1. 41°N, 21°E 2. 37°N, 76°W A B 3. 72°S, 141°W 4. 7°S, 23°W C D 5. 15°N, 29°E 6. 34°S, 151°E 19Mr Thompson – Earth Science
  20. 20. 1. B 2. A 3. C 5. B 4. C 6. D 20Mr Thompson – Earth Science
  21. 21. See if you can find those same latitude/longitude locations on a map! 21Mr Thompson – Earth Science
  22. 22. Positioning on the Earth’s Surface East is the direction of Latitude: (90oN to 90oS) rotation of the Earth North Pole Prime Meridian Longitude: (180oE to 180oW) 0o Longitude Tropic of Cancer Latitude 23½o North 21st June 60EW 90oE 3060ooW o 9030oW E o oo 9066½ o22nd Sept 23½ Equator Latitude 0o20 March th 900 23½o 22nd December Tropic of Capricorn Latitude 23½o SouthLongitude 90o West Longitude 90oEast Longitude 60o West Longitude 60o East Longitude 30o West Longitude 30o East South Pole 22 Latitude and Longitude together enable the fixing of position on the Earth’s surface.
  23. 23. Now you’re ready to find some locations on a map! Review At 23Mr Thompson – Earth Science