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# Understandinglongitudeandlatitude

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• 1. Understanding 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 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 ° 01’ 08’’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 ° 01’ 08’’ N
• 04° 33’ 20’’ 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!