Longitudes Role Longitude plays the most important role in telling time There are 360 of longitude 180 West and 180 East of Prime Meridian Longitude lines are spaced 15 apart in both directions from the ID: 732087
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AP HUMAN GEOGRAPHY
TIME ZONESSlide2
LONGITUDE’S ROLE
Longitude plays the most important role in telling time
There are 360◦ of longitude (180◦ West and 180◦ East of Prime Meridian)
Longitude lines are spaced 15◦ apart in both directions from the Prime MeridianSlide3
TIME ZONES
Meant to make time more uniform as the earth spins on its axis.
12 pm. Is midday everywhere, when the sun is high in the sky. 12 midnight is night everywhere.
This only happens as clocks change when one travels on either side of the Prime Meridian
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TIME ZONES
Slide5
INTERNATIONAL DATE LINE
This occurs at 180
◦ longitude and divides the world from pole to pole through the Pacific Ocean
If traveling from Asia to America, you set the clock BACK 24 hours, and vice-versaSlide6
WHAT HAPPENED BEFORE?
Solar Time was based on the position of the sun in the sky as the day progressed.
This led to differences between localities for railways and communicationsGovernments then synchronized clocks so travelers could easily adjust to time changes
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U.S. TIME ZONES
In 1883, four time zones were created in the United States:
Pacific Standard Time (6:00 am)
Mountain Standard Time (7:00 am)Central Standard Time (8:00 am)
Eastern Standard Time (9:00 am)