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      a measurement of distance, given in degrees east or west of the prime meridian. The prime meridian is a line that runs through the Greenwich Observatory in London, England. On a map or globe, lines of longitude are drawn from the North Pole to the South Pole.


Denver, Colorado, is at 105°W (105 degrees West) longitude.

The lines of longitude on the map tell us if a city is east or west of the prime meridian.



Related Links:
Latitude and Longitude Finder



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Map with lines of longitude labeled
On a map, longitude is shown by lines that go from north to south.
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Page Last Updated: July 17th, 2014
Page Editor: NASA Education