Latitude and Longitude

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Latitude and Longitude

• Every single location on Earth is described by 2
  numbers Latitude and Longitude.
• Latitude and longitude are a type of coordinate
  system

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Latitude

• Definition Latitude measures the distance in
  degrees NORTH and SOUTH of the EQUATOR.
• Latitude lines are horizontal. They look like
  this
• Because they run parallel to the EQUATOR, they
  are also called parallels. ALL parallels are 360º
  circles!

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The Equator

• The Equator is the imaginary circle found at 0º
  Latitude- it splits the Earth exactly in half,
  leaving a Northern half and a southern half.

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Latitude Values

• Each line of latitude north of that gets higher
  until you get to 90 N. That is the North Pole.
• Each line of latitude south of the equator gets
  higher until you get to 90 S. Thats the South
  Pole.

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Special Latitude Lines

• 1. Tropic of Cancer - found at 23 ½º North of
• the Equator.
• 2. Tropic of Capricorn found at 23 ½ º South
• of the Equator.
• 3. Artic Circle 66 ½ North Latitude
• 4. Antarctic Circle 66 ½ South Latitude

Ants on the ground, get it antactic its in the
south
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66.5
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Where is Polaris??

• http//ecuip.lib.uchicago.edu/diglib/science/cultu
  ral_astronomy/interactives/polaris/polaris.swf

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The angle of the North Star, also known as
Polaris, EQUALS the NORTH Latitude you are at.
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How can I find Polaris in the sky?
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Lets take a bike ride and see what happen.

• http//www.onr.navy.mil/focus/spacesciences/animat
  ion/observingsky/kid.swf

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Longitude

• Definition Longitude lines measure the distance
  in degrees EAST and WEST of the PRIME MERIDIAN.
• Longitude lines are vertical. They look like
  this
• These lines are also known as Meridians.

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The Prime Meridian

• The Prime Meridian is a HALF circle that runs
  from the North pole to the South pole.
• It is also 0 however it is 0 longitude. It does
  NOT run all the way around the Earth. The line
  on the other side is 180.

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The Prime Meridian

• The Prime Meridian divides the Earth into a west
  half (western hemisphere) and an east half
  (eastern hemisphere).
• The 180 line is known as the international date
  line.

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Now please start or continue working on your
review book assignment. We will do time zones as
a class together.