Navigation

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Navigation

• Unit 1-Planet Earth

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What is Navigation?

• The science of locating a position on earth

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What is navigation based upon?

• A coordinate system or grid system of imaginary
  lines on earths surface
• Theses lines coincide with the time of day and
  the position of the North Star or Polaris in the
  Northern hemisphere

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Time

• Day-Based on motions of earth (rotation)
• 24h to rotate/ 360
• 15/hr
• Month-Based on motions of the moon around the
  earth
• Year-Based on motions on the Earth around the sun
• Noon-time when the sun reaches its zenith

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GMT

• Greenwich Mean time (GMT)
• Time on the prime meridian (0) in Greenwich
  England

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Local clock Time

• Time where you are

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Traveling and Time

• West of the prime meridian is earlier
• East is later

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Terrestrial Coordinate Systems Latitude

• Latitude a measure of the angular distance North
  or South of the Equator
• Measures 0-90
• Lines are horizontal or run parallel to the
  equator thus called parallels
• Never meet

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Terrestrial Coordinate Systems Longitude

• Longitude lines that measure the angular
  distance east or west of the prime meridian
• Measures 0-180
• Also called meridians
• Are vertical
• Meet at the poles

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Celestial Navigation

• Uses the stars (North Star) and the Sun to
  determine ones location

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To Find Latitude

• If you know the altitude of the North Star or
  Polaris you can find your latitude
• THE ALTITUDE OF POLARIS IS EQUAL TO THE LATITUDE
  OF THE OBSERVER!!!

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To Find Longitude

• Must know your local time and the time on the
  prime meridian and if you are east or west of
  prime meridian
• Determine time difference
• Multiply difference by 15