2.6 Modelling the World

The World as a Sphere

  • The world can be approximated to be a sphere of radius 6400km.

Meridians

  • Meridians of longitude are circles drawn around the world with the same radius as the world and intercepting the north and south poles.

Example

In the above spherical representation of the world, a meridian of longitude is shown in red.

Parallels

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