line of longitude

Noun
  1. is a type of: great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
    subtypes:
    • 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
    specific instances: date line, dateline, international date line - an imaginary line on the surface of the earth following (approximately) the 180th meridian
    same as: meridian

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