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Latitude & Longitude. Latitude and Longitude. Latitude and Longitude are measure in DEGREES AND MINUTES X o Y ‘ Degrees Minutes There are 60 minutes in one degree Examples: Latitude  30 o 45’ N

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slide3
Latitude and Longitude are measure in DEGREES AND MINUTES

Xo Y ‘

Degrees Minutes

There are 60 minutes in one degree

Examples: Latitude  30o45’ N

Longitude  46o12’ E

latitude
Latitude
  • The distance in degrees,

north or south of the equator.

- North Pole = 90o N

- Equator = 0o

- South Pole = 90o S

  • The equator is the reference line for latitude.
  • If you draw a line from the equator to the center of the Earth and then to where a person is standing, the angle between the two lines is the persons latitude.
latitude1
Latitude

49o

Latitude lines are also called PARALLELS because they run parallel to the equator.

latitude2
Latitude
  • At night in the Northern Hemisphere, latitude can be determined by measuring the altitude of Polaris (North Star)
slide8

To Polaris

To Polaris

90°

40°

Horizon

To Polaris

North Pole

longitude
Longitude
  • Based on the Sun’s Apparent motion through the sky.
  • How long does it take the Earth to rotate once on its axis?
          • 24 hours
  • How many degrees does it rotate in this time?
          • 360o
  • Degrees per hour = 360/24 = 15o/hour
longitude1
Longitude
  • The distance, in degrees, measured east or west of the Prime Meridian.
  • Prime Meridian passes through Greenwich, England (Longitude 0o)
longitude2
Longitude
  • As you travel east or west from the Prime Meridian, longitude increases until it reaches 180o ( The International Date Line)
measuring longitude
Measuring Longitude
  • Greenwich Mean Time (GMT)
    • what time it is in Greenwich, England
    • 0o line for longitude
  • Solar Time – (noon)
    • when the sun reaches it highest altitude in the sky at your location.
measuring longitude1
Measuring Longitude
  • Remember – the Earth rotates at 15o/hr and that the Sun “appears” to move through the sky at the same rate.
  • If you know what time it is in Greenwich when it is noon at your location you can calculate your longitude.
measuring longitude2
Measuring Longitude
  • It was 2:00 pm in Greenwich (GMT) when it was noon at your location (12:00pm)
  • Time Difference =?

2 hours

  • 2 hours X 15o/hr

= 30o

  • Your longitude = 30oW

  Earth Rotates from W to E  

Note – If it is NOON your time and GMT = PM, you are WEST of the P.M.

If it is NOON your time and GMT = AM, you are EAST of the P.M.

writing latitude longitude
Writing Latitude & Longitude
  • Latitude (N or S) comes FIRST, followed by the longitude (E or W)

45o N, 33o E

85o S, 123o W

95o S, 47o E

Anything WRONG here!!

slide16

Nor

th

South

slide18

+

West

East

15 o/hr

60

45

30

15

0

15

30

45

30

Nor t h

20

10

equator

0

10

Sou t h

20

30

Prime Meridian

slide19

What is the latitude and longitude of the ship?

10o N, 45o W

West

East

60

45

30

15

0

15

30

45

30

Nor t h

20

10

equator

0

10

Sou t h

20

30

Prime Meridian

slide20

What is the latitude and longitude of the ship?

15o S, 35o E

West

East

60

45

30

15

0

15

30

45

30

Nor t h

20

10

equator

0

10

Sou t h

20

30

Prime Meridian

slide21

If it is noon at your location and 3 p.m. GMT, what is your longitude?

45o W 3 hours x 15o/hr

PM = West

West

East

60

45

30

15

0

15

30

45

30

Nor t h

20

10

equator

0

10

Sou t h

20

30

Prime Meridian

slide22

If it is noon at your location and 10 a.m. GMT, what is your longitude?

30o E 2 hours x 15o/hr

AM = East

West

East

60

45

30

15

0

15

30

45

30

Nor t h

20

10

equator

0

10

Sou t h

20

30

Prime Meridian

slide23

Proper written format = 20o N, 30o W

If it is noon at your location and 2 p.m. GMT, and the altitude of Polaris is 20o, what is your latitude and longitude?

Latitude = 20o N - Duh – North Star

Longitude = 30o W 2 hours x 15o/hr

PM = West

60

45

30

15

0

15

30

45

West

East

30

Nor t h

20

Noon

10

2 PM

equator

0

10

Sou t h

Earth’s Rotation

20

30

Prime Meridian

slide24

Proper written format = 15o N, 45o E

If it is noon at you location and 9 a.m. GMT, and the altitude of Polaris is 15o, what is your latitude and longitude?

Latitude = 15o N - once again - Duh

Longitude = 45o E 3 hours x 15o/hr

AM = East

60

45

30

15

0

15

30

45

West

East

30

Nor t h

20

10

equator

0

10

Sou t h

20

30

Prime Meridian