Time Zones http://www.youtube.com/watch?v=UBpTohx1BOc

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

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

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

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?

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?

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.

This pictures shows AMERICAN CITIES at night.

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

Iceland England Atlantic Ocean France Spain Italy AFRICA

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