Longitude

Longitude- a geographic coordinate that specifies the east-west position of a point on the Earth's surface

  1. shown as meridians, not parallels
  2. runs through poles
  3. used to measure distance in degrees east or west from the prime meridian 
Prime meridian- passes through Greenwich, England and is given the position of 0° longitude

  1. an imaginary line that divides the Earth into eastern and western hemispheres
  2. similar to the equator
  3. sometimes referred to as the Greenwich Meridian
  4. helpful in determining time zone
  • going in an eastward direction from the prime meridian the time increases by 4 minute per degree of longitude and it decreases by 4 minute per degree of longitude if you go west of the prime meridian           


                                                                         Time Zones

Time zone- a region of the globe that observes a uniform standard time for legal, commercial, and social purposes
UTC- the primary time standard by which the world regulates clocks and time

  • GMT is often used as a synonym for UTC
  • GMT is the mean solar time in Greenwich, London

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