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longitude

noun

lon·​gi·​tude ˈlän-jə-ˌtüd How to pronounce longitude (audio)
-ˌtyüd,
 British also  ˈläŋ-gə-
1
a
: angular distance measured on a great circle of reference from the intersection of the adopted zero meridian with this reference circle to the similar intersection of the meridian passing through the object
b
: the arc or portion of the earth's equator intersected between the meridian of a given place and the prime meridian and expressed either in degrees or in time
2
archaic : long duration

Illustration of longitude

Illustration of longitude
  • hemisphere marked with meridians of longitude

Did you know?

The imaginary (but very important) lines of longitude run from the North Pole to the South Pole. Each is identified by the number of degrees it lies east or west of the so-called prime meridian in Greenwich, England (part of London). A circle is divided into 360°; so, for example, the longitude of the Egyptian city of Cairo is about 31°E—that is, about 31° east of London. The "long" sense of the root may be easier to see in some uses of the adjective longitudinal: A longitudinal study is a research study that follows its subjects over many long years, and a longitudinal engine is one that drives a crankshaft that runs lengthwise under a vehicle (as in rear-wheel-drive cars) rather than crosswise.

Example Sentences

a map of the world showing lines of latitude and longitude calculating the longitudes of different places The regions are on roughly the same longitude.
Recent Examples on the Web Developed by Google, the tool takes the latitude and longitude of a location and then creates a unique code that functions as a street address. Erika Page, The Christian Science Monitor, 6 Sep. 2022 Longitude required comparing the local noon – the moment when the Sun was at its highest point – with the actual time at another location where the longitude was already known. Daniella Mccahey, The Conversation, 10 Mar. 2022 Consult the manual for your software to find out how to set the longitude of the Red Spot. Geoff Gaherty, Scientific American, 30 Nov. 2012 Imagine keeping track of multiple tropical systems with latitude and longitude numbers. Mallory Nicholls, Orlando Sentinel, 31 May 2022 The hope was that the easterlies tumbling seaward from the dry lungs of California’s San Bernardino Valley would slingshot her past Catalina Island and to 125 degrees west longitude, where the currents would shift in her favor. Andrew Lewis, Outside Online, 22 Oct. 2020 That all of these features float alongside a domed skeleton of latitude and longitude lines and still make room for a flying tourbillon in a circular aperture at 6 o’clock is a testament to the watchmaker’s twin mastery of art and mechanics. Paige Reddinger, Robb Report, 30 Mar. 2022 Peiresc helped to solve the mystery of longitude by writing innumerable letters to correspondents all over Europe and soliciting information from them about the relative positions of the sun, moon and stars on certain dates. Barton Swaim, WSJ, 4 Feb. 2022 Low pressure systems tracking over this spot -- the intersection of 40 degrees North latitude and 70 degrees West longitude -- are known for being significant in the Northeast, often bringing large amounts of snowfall to the area. Allison Chinchar And Monica Garrett, CNN, 25 Jan. 2022 See More

Word History

Etymology

Middle English, from Latin longitudin-, longitudo, from longus

First Known Use

15th century, in the meaning defined at sense 1a

Time Traveler
The first known use of longitude was in the 15th century

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