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UNIT ONE: Toward Independence

Lesson 17

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LONGITUDE AND TIME

LEFT SIDE
PAGE 40

1
WARM UP

What is time?

How did people measure time in the past?

What defines a day?

 

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CLICKING HERE!

 
 
 
 
 
 
 
 
 
 
3
Read and Attach:
"Longitude and Time"
  • Create margin notes on what you think is important.
    • Individually - Underline and highlight important information; in the margin provide a question or comment foe each hihlighted piece.
    • Share with your partner what you thought and selected.  Made changes if necessary.

RIGHT SIDE
PAGE 41

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2
OBJECTIVES:
  • Explain the concepts of "time" and "day".
  • Explain how longitude creates time zones.
  • Explain how the International Date Line operates.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4
NOTES:
  • Time
    • "Simply what a clock reads" - Einstein
      • The clock can be the rotation of a planet, sand falling in an hour glass, a heartbeat, or vibrations of a cesium atom
    • Time is represented through change, such as the rotation of the Earth
      • Time is the measurement of the movement of the Earth and its relationship to the Sun
  • Day
    • Created by the Earth's movement of ROTATION
      • One complete rotation or spin
      • Spins counterclockwise
        • in other words, the Earth spins eastward
        • so the Sun rises in the east
    • When the Sun is at its zenith, highest point, it is noon there
      • from midnight to noon is called "ante meridiem"
        • means "before noon"
        • abbreviated A.M.
      • from noon to midnight is called "post meridiem"
        • means "after noon"
        • abbreviated P.M.
    • Places to the east have a later time than places to the west
  • Time Zones
    • 15 wide band
      • 360 divided by 24 (hours in the day) = 15
      • the time zone is centered in each band
        • 7 1/2 to the east and the west
    • Time zones are not straight lines
      • time zones zigzag to meet the needs of people
    • Time zones to the east are later, time zones to the west are earlier
      • Each time zone is usually 1 hour in difference
  • International Date Line
    • A line of longitude
      • Opposite the the Prime Meridian (180)
      • Runs throught the Pacific Ocean
      • Not a straight line
    • A Dateline
      • Travel eastward across the IDL, a calendar day earlier (Monday changes to Sunday)
      • Travel westward across the IDL, a calendar day later (Sunday changes to Monday)
      • The TIME remains the same, only the date changes

 
Time
Day
Time Zones
International Date Line