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# Topic: Longitude

 Latitude and Longitude A lines of longitude is also called a meridian, derived from the Latin, from meri, a variation of "medius" which denotes "middle", and diem, meaning "day." The word once meant "noon", and times of the day before noon were known as "ante meridian";, while times after it were "post meridian."; Today's abbreviations a.m. All points on the same line of longitude experienced noon (and any other hour) at the same time and were therefore said to be on the same "meridian line", which became "meridian"; for short. Longitudes are measured from zero to 180° east and 180° west (or -180°), and both 180-degree longitudes share the same line, in the middle of the Pacific Ocean. www-istp.gsfc.nasa.gov /stargaze/Slatlong.htm   (1819 words)

 Latitude and Longitude Longitude values are indicate the angular distance between the Prime Meridian and points east or west of it on the surface of the Earth. The 180-degree longitude line is opposite the Prime Meridian on the globe, and is the same going either east or west. At a latitude of 45 degrees, a degree of longitude is approximately 49 miles. www.nationalatlas.gov /articles/mapping/a_latlong.html   (779 words)

 longitude. The Columbia Encyclopedia, Sixth Edition. 2001-05 A meridian of longitude is an imaginary line on the earth’s surface from pole to pole; two opposite meridians form a great circle dividing the earth into two hemispheres. All other points on the earth have longitudes ranging from 0° to 180°E or from 0° to 180°W. Except where it is changed to account for populated areas, the international date line lies along the 180° meridian. Meridians of longitude and parallels of latitude together form a grid by which any position on the earth’s surface can be specified. www.bartleby.com /65/lo/longitud.html   (212 words)

 Longitude - Wikipedia, the free encyclopedia Longitude is given as an angular measurement ranging from 0° at the Prime Meridian to +180° eastward and −180° westward. Ecliptic longitude is measured from 0° to 360° eastward (the direction that the Sun appears to move relative to the stars) along the ecliptic from the vernal equinox. Ecliptic longitude relative to a moving equinox is used whenever the positions of the Sun, Moon, planets, or stars at dates other than that of a fixed equinox is important, as in calendars, astrology, or celestial mechanics. en.wikipedia.org /wiki/Longitude   (1750 words)

 Latitude and Longitude Latitude and longitude are imaginary lines traced on the surface of the earth for the purpose of locating a specific place. Consecutive degrees of longitude are 60 miles apart at the equator, and all come together at the North Pole and the South Pole. The measurement of longitude was to remain inexact until the invention of the telescope and the accurate clock, almost two thousand years later. www.broward.org /library/bienes/lii14010.htm   (660 words)

 latitude and longitude - Hutchinson encyclopedia article about latitude and longitude   (Site not responding. Last check: ) Longitude is the angle between the terrestrial meridian through a place and the standard meridian 0° passing through Greenwich, England. Chronometers, time-keeping devices with sufficient accuracy for longitude determination, invented by English instrument-maker John Harrison (1693–1776) and perfected in 1759, would gradually replace the lunar distance method for navigation, but reliance on the Greenwich meridian persisted because the Nautical Almanac was used by sailors to verify their position. The Greenwich meridian was officially adopted as the Prime Meridian by the International Meridian Conference held in Washington, DC, in 1884. encyclopedia.farlex.com /Latitude+and+longitude   (446 words)

 The Columbia Encyclopedia, Sixth Edition: longitude @ HighBeam Research   (Site not responding. Last check: ) LONGITUDE [longitude], angular distance on the earth's surface measured along any latitude line such as the equator east or west of the prime meridian. A meridian of longitude is an imaginary line on the earth's surface from pole to pole; two opposite meridians form a great circle dividing the earth into two hemispheres. All other points on the earth have longitudes ranging from 0° to 180°E or from 0° to 180°W. Except where it is changed to account for populated areas, the international date line lies along the 180° meridian. www.highbeam.com /library/doc0.asp?DOCID=1E1:longitud&refid=ip_encyclopedia_hf   (205 words)

 Longitude - Metaweb   (Site not responding. Last check: ) Longitude, denoted λ, describes the location of a place on Earth east or west of a north-south line called the prime meridian. Longitude is given in an angular measurement ranging from 0° at the Prime Meridian to plus or minus 180°. In 1714 the question of finding the longitude at sea, which had been looked upon as an important one for several years, was brought into prominence by a petition presented to the House of Commons by a number of captains of Her Majesty's ships and merchant ships and of London merchants. www.metaweb.com /wiki/wiki.phtml?title=Longitude   (732 words)

 MSN Encarta - Latitude and Longitude Longitude, the location of a place east or west of a north-south line called the prime meridian, is measured in angles ranging from 0° at the prime meridian to 180° at the International Date Line. At the equator, meridians of longitude 1 degree apart are separated by a distance of 111.32 km (69.17 mi); at the poles, meridians converge. Each degree of latitude and longitude is divided into 60 minutes, and each minute divided into 60 seconds, thereby allowing the assignment of a precise numerical location to any place on earth. encarta.msn.com /encyclopedia_761563211/Latitude_and_Longitude.html   (444 words)

 Longitude prize - Wikipedia, the free encyclopedia The longitude prize was a prize offered by the British government through an Act of Parliament in 1714 for the precise determination of a ship's longitude. While most efforts had focused on a precise catalogue of stars, to be used together with the moon's position to determine longitude, Harrison attempted to build a precision clock which kept the time of the home port. With support from the Board of Longitude set up to administer the prize, he started in 1730 to build several spring-driven clocks, finally succeeding in 1761 with a determination of better than half a degree. en.wikipedia.org /wiki/Longitude_prize   (408 words)

 Latitude and Longitude Longitude values are indicate the angular distance between the Prime Meridian and points east or west of it on the surface of the Earth. The 180-degree longitude line is opposite the Prime Meridian on the globe, and is the same going either east or west. At a latitude of 45 degrees, a degree of longitude is approximately 49 miles. nationalatlas.gov /articles/mapping/a_latlong.html   (779 words)

 Unit 014 - Latitude and Longitude Longitude measures the position of a point on the earth's surface east or west from a specific meridian, the prime meridian. The longitude of a place is the arc, measured in degrees along a parallel of latitude from the prime meridian. The length of a degree of longitude along a meridian is not constant because of polar flattening. www.ncgia.ucsb.edu /education/curricula/giscc/units/u014/u014.html   (2059 words)

 More Latitude and Longitude Practice--True and False   (Site not responding. Last check: ) Longitude measures east or west of the prime meridian. Longitude must be describes as E or W unless it is the Prime Meridian or the International Date Line. The latitude and longitude coordinates of the south pole are 90°S. Answers: 1. www.jsu.edu /depart/geography/mhill/phygeogone/morlatln.html   (212 words)

 GeoSystems: Latitude and Longitude   (Site not responding. Last check: ) Longitude is the angular measurement of a place east or west of the prime meridian. Longitude runs from 0° at the prime meridian to 180° east or west, halfway around the globe. Because meridians converge at the poles, the length of a degree of longitude varies, from 69 miles at the equator to 0 at the poles (longitude becomes a point at the poles). www-personal.umich.edu /~sarhaus/tigdd27.html   (399 words)

 Interactive Map: The World: Latitude and Longitude Longitude measures distances east and west from the prime meridian. New Orleans is at 30 degrees north latitude, 90 degrees west longitude. Petersburg is 60 degrees north latitude, 30 degrees east longitude. www.eduplace.com /kids/hmss05/applications/imaps/maps/g3_u6   (228 words)

 longitude The ignorance of longitude wreaked economic havoc on a grand scale. Longitude was the secret that was to intervene between a world defined by disorder and chaos and a world defined by order and the rational mind. Hogarth had previously characterized the "longitude lunatic," but now with H-1 the idea of longitude solution as a joke of the insane had been transformed into a combination of art and science. www.wsu.edu /~hughesc/longitude.htm   (1716 words)

 Longitude and Latitude Data Storage and Transfer Specification Latitude and longitude are ellipsoidal coordinate representations that show locations on the surface of the earth using the earth's equator and the prime meridian (Greenwich, England) as the respective latitudinal and longitudinal origins. Longitudes east of the prime meridian shall be specified by a plus sign (+), or by the absence of a (-) sign, preceding the integer designating degrees of longitude. Longitudes west of the meridian shall be designated by minus sign preceding the integer designating degrees. www.tbs-sct.gc.ca /rpm-gbi/guides/Latlong_e.asp   (1070 words)

 map of latitude longitude lines absolute relative locations explanations Longitude (shown as a vertical line) is the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime (Greenwich) Meridian. Lines of longitude are often referred to as meridians. Enter a latitude and longitude and find what's at that intersection, or (location) on the planet HERE This is a worldwide project and you can read more about. www.worldatlas.com /aatlas/imageg.htm   (571 words)

 Basic Geography: Latitude and Longitude and longitude are two of the most basics terms in all of geography. Longitude is lines that run north and south that measure east or west. The Prime Meridian, in Greenwich, England, is at 0 degrees longitude. www.socialstudiesforkids.com /articles/geography/latitudelongitude.htm   (369 words)

 Longitude Without the ability to calculate longitude, ships were easily lost looking for small islands or run aground at night when they weren't expecting to be near to land. The search for a solution to the longitude problem was deemed so important that in 1714 the British Parliament passed a law which offered £20,000 (approximately \$12 million in today's currency) to the first person who invented a practical method of measuring longitude. The chief rival to this system was computing longitude by reference to the moon's position with respect to the sun and key reference stars and comparing these positions to predicted positions at home. www.craigr.com /books/longitude.htm   (440 words)

 harrison.HTM   (Site not responding. Last check: ) Accurate measurment of a ship's longitude, or position to the east or west of a given point on the globe, was considered by many sailors to be an unsolvable problem in navigation. Many members of the Board of Longitude were astronomers by profession, and were somwhat biased in favor of astronomical methods of solving navigational problems. Harrison's watch cannot be depended upon to keep the Longitude within one degree in a voyage of six weeks." Damning with faint praise, Maskelyne added that Harrison's watch might be useful at times--when his own technique of lunar observation was hindered by overcast skies, for example. www.oldnewspublishing.com /harrison.htm   (1513 words)

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