1. Time Zones

2. THERE IS A 1 HOUR TIME DIFFERENCE FOR EVERY 15° OF LONGITUDE
Longitude and Time
The world rotates 360° in 24 hours
So how many degrees do we travel each hours?
360° / 24 = 15° per hour
The world has 24 time zones, each 15° apart
THERE IS A 1 HOUR TIME DIFFERENCE FOR EVERY 15° OF LONGITUDE

4. Greenwich, England is the Starting Point for Time Zones
The world rotates _____________________ west to east
So... Time zones to the east are ahead of those time zones to the west
counterclockwise

5. EAST INCREASE WEST LESS
Time is _______________ to all places to the east
WEST LESS
Time is _________________ to all places to the west
forward
backward

6. East Increase – West Less (1 hour per 15°)B
If it is 2 pm at position A, what time is it at position B?
If it is 1 am at position B, what time is it at position C?
If it is 1 am at position B, what time is it at position A?

7. East Increase – West Less (1 hour per 15°)
If it is 9 pm at position D, what time is it at position C? Position B?
If it is 1 pm at position X, at which location is the time 5 pm?

8. Earth rotates west to east – solar time is based on the position of the sun
NIGHT IS FALLING ON EARTH
Look at the East Coast of the United States. The lights are already lit. However, in California, the lights are already lit.

9. This pictures shows AMERICAN CITIES at night.

10. It’s still daylight in California
Saguenay
Sept-Iles
Thunder Bay
Toronto
St.John
Ottawa
It’s still daylight in California
Québec
Montréal
Those light are Boston, New York, Philadelphia and Washington.
Detroit
Dallas
Puerto Rico
Houston
Miami
Mexico City
Havana
Port-au-Prince

11. Iceland
England
Atlantic
Ocean
France
Spain
Italy
AFRICA

12. International Date Line
180°
_____ Longitude
Separates two calendar days
America  Asia = _________ a day
Asian  America = _________ a day
gains
lose