meridian

Examples of meridian in the following topics:

• Mapping the Earth

  • Across the spherical Earth, longitude lines, also called meridians, stretch vertically from the North Pole to the South Pole.
  • Similarly, the prime meridian is the line of zero degrees longitude (shown in red in the center panel of the above image).
  • In most coordinate systems, the prime meridian passes through Greenwich, England.
  • Longitude runs from -180 degrees (west of the prime meridian) to 180 degrees (east of the same meridian).
  • The Western Hemisphere and the Eastern Hemisphere refer to the halves of the globe that are west and east of the prime meridian, respectively.

• Surfaces in Space

  • For example, the surface of the Earth is (ideally) a two-dimensional surface, and latitude and longitude provide two-dimensional coordinates on it (except at the poles and along the 180th meridian).

• Seasonal Affective Disorder and Jet Lag

  • The condition is not linked to length of flight, but to the trans-meridian (west–east) distance traveled.