Grids and time zones

• • Eratosthenes (195 BCE)- The first person to map the world, the only accurate part is the Mediterranean Sea
  • Longitude- is a geographic coordinate that specifies the east-west position of a point on Earth's surface
  • Longitude- is measured by imaginary lines circling the Earth and running through the poles, and used to measure distance and degrees east or west from the Prime Meridian
  • The Prime Meridian passes through Greenwich, England, and is given the position 0 degrees longitude
  
  
  • Longitude:
  1. Known as meridians
  2. north-south direction
  3. measure east-west of Prime Meridian 
  4. Farthest apart at Equator and meet at the poles
  5. equal in length
  6. Halves of great circles