Student World Atlas (Maailma atlas)
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ning at th e Prim e Meridian, whi ch ru ns th rough d ay m oves ahead o ne hour for eac h zo ne Adjustm en ts a re necessary when "d aylight
Green wich , Eng land. T he twelve zo nes eas t and cros sed . T ravelm g west , n rne falls beh ind o ne saving ti me " IS use d.
twelve zo nes west of the Prim e M errdian meer hou r per zo ne . At the Intern ati on al Da te L1Ile a
halfway aro und the glo be at the Intern ati on al tr aveler gall1s o ne day croSSIl1g It III an eas te rly
Date Lin e. d irection, and loses one day rraveli ng west.
Average Speeds of
Some Passenger Transportation
Walking 3-4 mph/ 5-6 kph
Bicycle 10 mph/16 kph
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