line of longitude

Other forms: lines of longitude

Definitions of line of longitude

1. noun

   an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
   synonyms: meridian

   examples:

   International Date Line

   an imaginary line on the surface of the earth following (approximately) the 180th meridian

   types:

   observer's meridian

   a meridian that passes through the observer's zenith

   prime meridian

   meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)

   magnetic meridian

   an imaginary line passing through both magnetic poles of the Earth

   type of:

   great circle

   a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center