1. MODELS OF THE EARTH

3. 60 N
30 N

5. 60’
Lat? Long? X
60’

6. Parallel lines of sight

7. Altitude of Polaris = latitudeW
60º S N E
Latitude = 60º

9. The entire
Earth rotates
15º/hr around
an axis

10. Time zones exist because the Earth is round

11. Time Zones 24 time zones 1 hour difference between each zone
15 degrees of longitude between each zone
Actual zones zig zag to avoid city and state boundaries

12. Time gets later as you travel east
Change your day when you cross midnight
Earth’s Rotation

13. Also change your day when you cross the International Dateline
West-ahead 1 day
East- back 1 day
Also change your day when you cross the International Dateline

15. U.S. Time Zones

16. Solar Noon: Telling time by the Sun
When the sun is at its highest point in the sky at your location
It’s not necessarily noon on the clock unless you live in the middle of the time zone
Who gets solar noon first, Maine or New York?
Who gets noon on the clock first?

17. Greenwich, England
Greenwich
Observatory
Clock

18. To the naked
eye the earth
appears
perfectly
round

19. Oblate Spheroid

20. 2 1
Which would be the best
model of earth? 3

21. From this satellite view our Earth appears round
But how could early man see evidence for a round earth ?

22. Evidence of Earth’s Shape
Earth’s shadow
A lunar eclipse

23. What happens to the appearance
of the ship as it sails away from us?

24. Ships may only be placed in the open ocean on the intersection of
Battleship Game
Ships may only be placed in the open ocean on the intersection of
Lat. and Long. lines
XX = Destroyer (2)
XXX = Battleship (2)
XXXX = Carrier (2)
May go diagonally