Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
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 • 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.
Latitude 49o Latitude lines are also called PARALLELS because they run parallel to the equator.
Latitude • At night in the Northern Hemisphere, latitude can be determined by measuring the altitude of Polaris (North Star)
To Polaris To Polaris 90° 40° Horizon To Polaris North Pole 0°
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
Longitude • The distance, in degrees, measured east or west of the Prime Meridian. • Prime Meridian passes through Greenwich, England (Longitude 0o)
Longitude • As you travel east or west from the Prime Meridian, longitude increases until it reaches 180o ( The International Date Line)
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 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 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 • 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!!
Nor th South
+ 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
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
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
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
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
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
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