line of longitude

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Related to Meridian (geography): prime meridian, geographic meridian
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Noun1.line of longitude - an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equatorline of longitude - an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude"
great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
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