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Understanding Longitude And Latitude
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Understanding Longitude And Latitude

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  • 1. Unnderstanding Longitude & Latitude
  • 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.
  • 3. Typical Graph
    • Each point has two values:
    • The “X” value that runs along the horizontal “X” axis
    • The “Y” value that runs along the vertical “Y” axis
    Y axis X axis
  • 4. Typical Graph
    • X value is always stated first
    • Followed by the Y value
    • The “origin” is the point where the 2 axes intersect with a value of (0,0)
    (0,0) (3,8) Y X (9,5)
  • 5. Typical Graph
    • A point can also have negative (-) values
    • Negative X values are to the left of the origin (0,0)
    • Negative Y values are below the origin
    X Y (-X,+Y) (+X,-Y) (+X,+Y) (-X,-Y) (0,0)
  • 6. East West, North South on The Earth
    • Let the X axis be the Equator.
    • Let the Y axis be the Prime Meridian that runs through Greenwich outside of London.
    • Lat/Long are the 2 grid points by which you can locate any point on earth.
    Y X
  • 7. East West, North South on the Earth
    • Let each of the four quarters then be designated by North or South and East or West.
    N S E W
  • 8. East West, North South on the Earth
    • The N tells us we’re 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 Prime Meridian .
    (N, W) (N, E) (S, W) (S, E)
  • 9. East West, North South on the Earth
    • That means all points in North America will have a North latitude and a West longitude because it is North of the Equator and West of the Prime Meridian.
    (N, W) Prime Meridian
  • 10. 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!
  • 11. What is Latitude?
    • Latitude is the distance from the equator along the Y axis.
    • All points along the equator have a value of 0 degrees latitude.
    • North pole = 90 °N
    • South pole = 90 °S
    • Values are expressed in terms of degrees.
    Y X 90 °S 90 °N
  • 12. What is Latitude?
    • Each degree of latitude is divided into 60 minutes.
    • Each minute is divided into 60 seconds.
    Y X 90 °S 90 °N This is also true of longitude.
  • 13. What is Latitude?
    • For Example:
    • 37 °, 02’,51’’N
    • This is close to the latitude where you live.
    Y X 90 °S 90 °N
  • 14. What is Longitude?
    • Longitude is the distance from the prime meridian along the X axis.
    • All points along the prime meridian have a value of 0 degrees longitude.
    • The earth is divided into two parts, or hemispheres, of east and west longitude.
    Y X 180 °W 180 °E
  • 15. What is Longitude?
    • The earth is divided into 360 equal slices (meridians)
    • 180 west and 180 east of the prime meridian
    Y X 180 °W 180 °E
  • 16. What is Latitude?
    • Our latitude and longitude might be:
    • 37 °, 03’,13’’N
    • 76°, 29’, 45’’W
    Y X 90 °S 90 °N
  • 17. 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.
  • 18. See If You Can Tell In Which Quarter These Lon/Lats Are Located
    • 1. 41 °N, 21°E
    • 2. 37°N, 76°W
    • 3. 72°S, 141°W
    • 4. 7°S, 23°W
    • 5. 15°N, 29°E
    • 6. 34°S, 151°E
    A B C D
  • 19.
    • 1. B
    • 2. A
    • 3. C
    • 4. C
    • 5. B
    • 6. D
    Let's See How You Did!
  • 20.
    • See if you can find those same latitude/longitude locations on a map!
  • 21. In Summary!
  • 22. Positioning on the Earth’s Surface Latitude and Longitude together enable the fixing of position on the Earth’s surface. Equator Latitude 0 o Latitude: ( 90 o N to 90 o S) Latitude 23½ o North Tropic of Cancer Latitude 23½ o South Tropic of Capricorn Longitude 30 o East Longitude 60 o East Longitude 30 o West Longitude 60 o West East is the direction of rotation of the Earth North Pole South Pole 23½ o 23½ o 66½ o 90 o 90 0 21 st June 22 nd December 22 nd Sept 20 th March 30 o E 60 o E 90 o E 90 o W 30 o W 60 o W Longitude 90 o East Longitude 90 o West Prime Meridian 0 o Longitude Longitude: (180 o E to 180 o W)
  • 23. Now you’re ready to find some locations on a map!

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