LATITUDE AND LONGITUDE
GEOGRAPHY 2840
LAB #1 - KEY


Refer to grid lines on a globe:

  1. The lines running north-south represent degrees of Longitude, which is measured from the Prime Meridian in a east and west direction. These lines ar e known also as meridians.

  2. The lines running east-west represent degrees of latitude which is measured from the equator in an north and south direction. These lines are known also as parallels.

  3. The geographic grid used on the globe is based on the division of a circle in 360 degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds .

  4. Latitude is numbered from degrees at the equator to 90° degrees at either pole.

  5. Longitude is numbered from degrees at the prime meridian to 180° degrees at the international date line.

  6. A degree of latitude is approximately 69.171 miles at the equator and 69.171 miles at the poles. A degree of longitude is approximately 69.171 miles at the equator and 0miles at the poles.


    LENGTH OF A DEGREE OF LONGITUDE: A degree of longitude varies in length at different latitudes, becoming shorter as the latitude increases. The table below illustrates this:

    Length of a Degree of Longitude

    At Latitude Statute Miles At Latitude Statute Miles
    0 69.171 50 44.552
    10 69.128 60 34.674
    20 65.026 70 23.729
    30 59.956 80 12.051
    40 53.063 90 0.000

    Based upon the above table, answer questions 7-12.

  7. How do the length of parallels differ as one approaches the poles? => they decrease

  8. What is the distance in miles around the world at the equator? => 24,901 miles

  9. What is the distance around the world at 40 ° South Latitude? => 19,103 miles

  10. At which latitude is the distance around the world one-half of the equatorial distance? => 60°N or S

  11. How many miles between a point 60 ° North Latitude and 30 ° West longitude and a point 60 ° North Latitude and 60 ° East Longitude? => 3,121

  12. How many miles between a point 30 ° South Latitude and 60 ° West Longitude and a point 30 ° South Latitude and 80 ° East Longitude? => 8,394 (60 + 80) = 140° * 59.956 = 8,394

  13. Define GEOGRAPHIC COORDINATE. => a system to determine an exact location on a map

    USE THE FIGURE BELOW TO ANSWER QUESTIONS 14-19


  14. What are the coordinates of point A? => 30°N lat, 90°W long

  15. Locate the same coordinates on a globe. In what country is point A located? => USA

  16. What are the coordinates of point B? => 30°S lat, 30°E long

  17. Locate the same coordinates on the globe. In what country is point B located? => South Africa

  18. Locate a point at 10 ° South Latitude and 45 ° West Longitude. Mark it CB.

  19. Locate a point at 20 ° North Latitude and 75 ° East Longitude. Mark it D.

  20. By examining the coordinates only, determine the APPROXIMATE distance between:
    a. New Orleans and St. Louis => 71/2° or 518 miles
    b. Philadelphia and Denver => 30° or 1591 miles
    c. Wilmington, N.C. and Los Angeles => 2280 miles
    d. Madrid, Spain and Edinburgh, Scotland => 1070 miles

  21. Write the following in their correct form:
    60 degrees, 29 minutes, 5 seconds, North Latitude => 60°29'05" N lat
    10 degrees, 20 minutes, 50 seconds, South Latitude => 10°20'50"S lat
    125 degrees, 45 minutes, 3 seconds, West Longitude => 125° 45' 03" W long

  22. Correct the errors in the following:
    89° 47' 65" S => 89° 48' 05" S
    185° 24' 37" E => 174° 35' 23" W
    65° 77' 42" W => 66° 17' 42"
    40° 50" 21' S => 40° 21' 50" S

  23. What is the latitude and longitude of Chicago Ill.? => 41° 45" Nlat; 87° 40" Wlong

  24. What large city has a similar latitude to that of Chicago (Europe)? => Rome

  25. What is this cities Latitude and longitude? => 41° Nlat; 12°30' Elong

  26. What large city in Asia has a similar latitude to that of Chicago? => Beijing

  27. What is this city's Latitude and Longitude? => 40° Nlat ; 117° Elong

  28. The term "antipodes" refers to two places on opposite sides of the earth so that a straight line drawn through the earth from one to the other passes through the center of the earth. To be exact antipodes, two places must be 180 ° of longitude away from each other, antipode must be as many degrees north latitude as the other is south latitude.

    What are the coordinates of the antipode of Chicago? => 41° 45"S lat; 92° 20' E long
    What is the nearest large land mass? => Australia
    What is the nearest large city? => Perth

  29. Below are some geographic grid coordinates for selected cities of the world. Examine an atlas and identify each city.
    34° 03' N, 118 ° 15' W => Los Angeles
    34 ° 20' S, 58 ° 30' W => Buenos Aires
    52° 21' N, 4 ° 52' E => Amsterdam
    61 ° 12'N, 149 ° 48' W=> Anchorage

  30. A number of cities are listed below. Using an atlas, give latitude and longitude of each in degrees and minutes.
    Milwaukee, Wisconsin => 43°05'N , 87°55'W
    Quito, Ecuador => 0° 20'S , 78° 30' W
    Calcutta, India => 22° 30'N , 88°20'E
    London England =>51° 30'N , 0° 10'W
    Capetown, South Africa =>33° 45'S , 18° 30'E
    Moscow, Russia => 55° 50'N , 37° 45'E
    Miami, Florida => 25° 50'N , 80° 20'W

31. Latitude and longitude readings can written in several different forms:

DDD.DDD = 38.4321°
DDD.MM.MMM = 38° 25.926'
DDD.MM.SS.SSS = 38° 25' 55.56"

a) Convert from DD.MM.SS.SSS to DD.MM.MMM

N52° 23' 48" W129° 55' 43" => N52° 23.8 W129° 55.7166

b) Convert from DD.MM.MMM to DD.DDDDDD

N87° 02' 45" W2° 34' 12" => N87.04583° W02.57°

b) Convert from DD.DDD TO DDD.MM.SS.SSS

S 34.9876° W 32.4567° => S34° 59' 15.36" W32° 27' 24.12"