Latitude & Longitude

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# Latitude & Longitude - PowerPoint PPT Presentation

##### Latitude & Longitude

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1. Latitude &Longitude

2. Latitude and Longitude

3. 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

4. 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.

5. Latitude 49o Latitude lines are also called PARALLELS because they run parallel to the equator.

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

7. To Polaris To Polaris 90° 40° Horizon To Polaris North Pole 0°

8. 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

9. Longitude • The distance, in degrees, measured east or west of the Prime Meridian. • Prime Meridian passes through Greenwich, England (Longitude 0o)

10. Longitude • As you travel east or west from the Prime Meridian, longitude increases until it reaches 180o ( The International Date Line)

11. 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.

12. 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.

13. 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.

14. 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!!

15. Nor th South

16. + 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. ESRT