longitude
n. uncountablen. the distance of a place east or west of an imaginary line that runs from the North Pole to the South Pole. It is measured in degrees.
n. the angular distance of a place east or west of the prime meridian at Greenwich, England. Measured in degrees from 0 to 180.
The ship's captain checked the longitude on the map.
To find the exact location of the island, you need to know both its latitude and its longitude.
Historically, determining longitude at sea was a significant challenge for navigators until the invention of the marine chronometer allowed for precise timekeeping relative to a reference meridian.
From Middle English, borrowed from Old French longitude, from Latin longitūdō (“length, a measured length”), from longus (“long”).
Often paired with 'latitude' to provide a complete set of geographic coordinates.
The longitude of Paris is 2.3 degrees NorthThe longitude of Paris is 2.3 degrees EastLongitude measures East-West position; North-South position is measured by latitude.