Where on Earth are You?

1. Where on Earth are You?

2. Latitude and longitude • Measured in degrees, minutes, seconds • 1 degree = 60 minutes (1° = 60’) • 1 minute = 60 seconds (1’ = 60’’) Nautical mile (nm) • 1 nm = 1’ of arc length of latitude • 1 nm = 1’ of arc length of longitude at the equator

3. Latitude and longitude Latitudes (or parallels) are parallel to the equator • 0 to +90° Northern Hemisphere • 0 to -90° Southern Hemisphere • Small circles Longitudes (or meridians) are formed at right angles to the latitude lines • Measured from the Prime Meridian • 0 to 360° East from the Prime meridian • Or, 0 to +180°E and 0 to -180°W • International date line • Great circles

4. North Pole 60°N 30°N Latitude 0° Equator 30°S South Pole Latitude

5. Measuring latitude – North Star, Polaris 30°

7. North Pole Reference: Prime meridian Longitude 60°W 0° at Greenwich South Pole Determining Longitudes

8. Longitude and time • Use of clocks to record the time the Sun is at its zenith • Greenwich Mean Time (GMT) or Universal Time • Earth rotates 15° of longitude each hour http://www.rmg.co.uk/harrison

9. Time Zones

10. http://www.bbc.co.uk/news/world-13334229 (Samoa changes time zone)

11. East Increase – West Less(1 hr per l5°) If it 9 p.m. at Position D, what time is it at position C? Position B? If it is 1 p.m. at Position X, at which location is the time 5 p.m.

12. Earth rotates west to east Solar time is based on the position of the sunNIGHT IS FALLING ON EARTH • Look at the East Coast of the United States. The lights are already lit. • California the sun is still visible.

13. This pictures shows AMERICAN CITIES at night.

14. Waikiki