Time

1
Time
TIME
2
The Earth Rotates on Its Axis One Turn Every 24
Hours
3
Longitude

• Lines of longitude run from pole to pole.
• All lines of longitude are the same length.
• Longitude lines are not parallel.
• The Prime Meridian which passes through
  Greenwich, UK is 0o longitude.
• The highest longitude is 180o. This is also the
  International Dateline.

East of Greenwich
Prime
4
Day length and time

• There are 360o in a circle and the Earth rotates
  one full turn on its axis every 24 hours.
• Therefore in one hour the Earth rotates 360/24
  15o.
• If a place is 30o east of your location, local
  time will be 2 hours later.
• If a place is 30o west of your location, local
  time will be 2 hours earlier.

5
Time

• Time depends on the longitude.
• At 12 noon the sun is at its highest angle.
• The sun rises in the east and sets in the west.
• Places east of Greenwich UK will see sunrise
  earlier.
• Places to the west will see the sunrise later.

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World Time Zones
7
U.S. Time Zones