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# Topic: Prime Meridian

###### In the News (Thu 27 Jun 19)

 Meridian (geography) - Wikipedia, the free encyclopedia On the Earth, a meridian is an imaginary north-south line between the North Pole and the South Pole that connects all locations with a given longitude. The position on the meridian is given by the latitude. Considering the meridian that passes through Greenwich, England, as establishing the meaning of zero degrees of longitude, or the Prime Meridian, any other meridian is identified by the angle, referenced to the center of the earth as vertex, between where it and the prime meridian cross the equator. en.wikipedia.org /wiki/Meridian_(geography)   (235 words)

 Prime Meridian - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-05) Resolution 2, fixing the meridian at Greenwich, was passed 22-1 (San Domingo, now Dominican Republic, voted against); France and Brazil abstained. The meridian through Greenwich was selected as the Prime Meridian because over two thirds of all ships and tonnage already used it as the reference meridian on their maps in 1884. Prime meridians in use in the 1880s, by country (http://wwp.greenwichmeantime.com/info/prime-meridian.htm) www.collegestation.us /project/wikipedia/index.php/Prime_Meridian   (441 words)

 Planetographic Coordinates The prime meridian is an arbitrarily chosen meridian, typically passing through a prominent feature of the planet, such as a crater. A prime meridian is defined by the position of some prominent feature; positive longitude is in the direction of rotation, and positive latitude is in the direction of the north pole. The prime meridian passes through the mean center of the lunar disk as it faces the Earth. documents.wolfram.com /applications/astronomer/AdditionalInformation/PlanetographicCoordinates.html   (706 words)

 Latitude and Longitude By international agreement, the meridian line through Greenwich, England, is currently given the value of 0 degrees of longitude; this meridian is referred to as the Prime Meridian. Longitude values are indicate the angular distance between the Prime Meridian and points east or west of it on the surface of the Earth. Prime Meridian—The meridian of longitude 0 degrees, used as the origin for the measurement of longitude. www.nationalatlas.gov /articles/mapping/a_latlong.html   (779 words)

 Oxfam's Cool Planet - On the Line - What is the meridian line? The Greenwich Meridian was chosen as the Prime Meridian of the World in 1884 at the International Meridian Conference, where forty-one delegates from 25 nations met in Washington DC. The second was that in the late 19th century, 72 per cent of the world's commerce depended on sea-charts which used Greenwich as the Prime Meridian. Therefore the Prime Meridian at Greenwich became the centre of world time, and will be the official starting point for the new Millennium. www.oxfam.org.uk /coolplanet/ontheline/explore/meridian.htm   (389 words)

 [GRASS5] PROJ_INFO and prime meridian According to: http://www.remotesensing.org/proj/gen_parms.html "pm - Prime Meridian A prime meridian may be declared indicating the offset between the prime meridian of the declared coordinate system and that of greenwich. A prime meridian is clared using the "pm" parameter, and may be assigned a symbolic name, or the longitude of the alternative prime meridian relative to greenwich. Currently prime meridian declarations are only utilized by the pj_transform() API call, not the pj_inv() and pj_fwd() calls. grass.itc.it /pipermail/grass5/2003-June/008033.html   (530 words)

 Mappa.Mundi Magazine - Locus - Meridian Longitude lines are called "meridians," from the Latin "meridiem," or "middle of the day," because on any meridian the sun is overhead at noon, and a meridian used as a starting point is a "prime" or "first" meridian. French cartographers used a meridian that ran through Paris, while a Scottish astronomer proposed a prime meridian at the Great Pyramid of Giza, which was desirable not only because it was a high, fixed point but because it was close to Jerusalem, the spiritual prime meridian of the faithful. In 1884 the question of where to locate the Prime Meridian was settled at a conference in Washington, D.C. Delegates from 25 nations met to decide where the international standard prime meridian would be located. mappa.mundi.net /locus/locus_015   (1005 words)

 prime meridian on Encyclopedia.com PRIME MERIDIAN [prime meridian] meridian that is designated zero degree (0°) longitude, from which all other longitudes are measured. Universal time, the standard basis for determining time throughout the world, is civil time measured at the prime meridian. Meridian Funds Studies At University of Utah to Expand Life-saving Ability of Prime ECG. www.encyclopedia.com /html/p1/primemer.asp   (321 words)

 Geography Glossary Meridians meet at the poles and are widest apart at the equator. The four hemispheres are the Northern and Southern hemispheres, divided by the equator (0° latitude), and the Eastern and Western hemispheres, divided by the prime meridian (0° longitude) and the International Date Line (180°). The prime meridian runs through the Royal Greenwich Observatory in Greenwich, England (the location was established in 1884 by international agreement). www.factmonster.com /ipka/A0908193.html   (1087 words)

 SU | menu | Exhibition 2002 The observatory's association with the prime meridian is direct since until recently the astronomic instrumentation used to determine it was housed there in a dedicated building-annex labelled "Primo Meridiano" on a plaque over the door. This was a prime meridian based on the westernmost of the Canary Islands off the coast of North Africa, which was thought by ancient geographers to mark the western limit of the world, hence they reckoned longitude from it. The continued use of the Monte Mario meridian, in spite of Italy's adherence to the 1884 International Meridian Conference which settled on Greenwich as the international Prime meridian, is a significant indication of the young Italian state's desire to emphasize its unity and individuality. www.studiumurbis.org /menu/exhibition_02.html   (886 words)

 The Project Gutenberg eBook of International Conference Held at Washington for the Purpose of Fixing a Prime Meridian ... In making the choice of a prime meridian which is to serve for a great period of time, it is important to so fix and define it that the natural changes of time may not render it in the least degree uncertain. This meridian of Ferro, which at first had the purely geographical and neutral character which could alone establish and maintain it as an international first meridian, was deprived of its original characteristic by the geographer Delisle, who, to simplify the figures, placed it at 20 degrees in round numbers west of Paris. Whatever that meridian might be, we must always assume for it a certain number of degrees from the capital of the country, where the place to be determined is located, and then take that imaginary meridian instead of a real point on the surface of the globe. www.gutenberg.org /files/17759/17759-h/17759-h.htm   (11491 words)

 Latitude, longitude and the prime meridian   (Site not responding. Last check: 2007-11-05) This line of longitude is referred to as the prime meridian and is assigned a value of 0° longitude. The position of the prime meridian was chosen arbitrarily. Because the earth is essentially a sphere, lines of longitude range from 0° to 180° east and west of the prime meridian with 0° east and west longitude beginning at the prime meridian and 180° east and west longitude being at a point on the other side of the earth directly opposite the prime meridian. www.uta.edu /paleomap/geol1435/latitude.htm   (526 words)

 Basic Geography: The Equator and the Prime Meridian For instance, the United States is in the Western Hemisphere (because it is west of the prime meridian) and also in the Northern Hemisphere (because it is north of the equator). The earliest maps have the equator marked on them, but it wasn't until the late 19th Century that the prime meridian was named. The International Meridian Conference of 1884 changed all that, naming an imaginary line drawn through Greenwhich, England, as the prime meridian. www.socialstudiesforkids.com /articles/geography/equatorprimemeridian.htm   (253 words)

 Navis.gr - Latitude and Longitude Longitude is seen to be a measure of the angle between the planes of two meridian circles, one of which is the prime meridian. Lines of longitude are numbered east of the prime meridian from 0 to 180 east longitude and west from 0 to 180 west longitude. Before a prime meridian was agreed upon, map makers usually began numbering the lines of longitude on their maps at whichever meridian passed through the site of their national observatory. www.navis.gr /marinav/latlong.htm   (2245 words)

 Online edition of Daily News - Features   (Site not responding. Last check: 2007-11-05) A meridian is an arbitrary north-south line used by an astronomer as a zero point from where to take measurements. So when we say the meridian line in Greenwich is the world's accepted Prime Meridian it means that every place on the earth is measured in terms of its angle : east or west from this line. The Greenwich Meridian was chosen as the Prime Meridian of the World in 1884. www.dailynews.lk /2003/11/12/fea08.html   (737 words)

 Nautical Charts: Origin of Prime Meridan   (Site not responding. Last check: 2007-11-05) Until such a time, they suggested a variety of ways of estimating the difference in time between the starting point (prime meridian) and where they were, including the path of the solar eclipse. Even as their sea-power waned, Portugal's prime meridian remained the world standard until the English achieved dominance during the nineteenth century. In 1884 a European conference narrowly ratified the placement of the prime meridian in Greenwich England. www.ruf.rice.edu /~feegi/chart2.html   (212 words)

 Lecture: Longitude, Dr. Rodrigue Except for the prime meridian and the antipodal meridian (most of which is the International Date Line), the suffix "E" or "W" must appear after the number given for the longitude: It definitely helps to know which hemisphere we're talking about, since the numbering is the same in each hemisphere. Meridians are spaced the farthest apart at the equator and converge closer and closer together until they actually touch at each pole. All meridians are true north-south lines used to represent east- west longitude with respect to the Prime Meridian. www.csulb.edu /~rodrigue/geog140/lectures/longitude.html   (2444 words)

 Greenwich Guide - The Prime Meridian An International Meridian Conference was convened at Washington in 1884 and the delegates recommended to their respective governments that Greenwich should be adopted as the prime meridian. GMT is mean solar time, with midday defined as the at the time at which the sun crosses the Greenwich Meridian, 0 degrees longitude. Because the Earth's orbit is elliptical, the sun doesn't appear to move against the stars at a constant speed, so a hypothetical mean sun is used, imagined to travel at a constant speed, the average of the sun's actual speed. www.greenwich-guide.org.uk /meridian.htm   (527 words)

 [No title]   (Site not responding. Last check: 2007-11-05) The prime or first meridian (primus meridianus) is an arbitrary line, one from which chart makers and map makers can begin to measure and to count longitudinal distance on the face of the globe. Although Ptolemy's astronomical work was conducted in Alexandria, he chose the Fortunate Islands (the Canaries) as the physical location of the prime meridian from which point he measured and laid down the roughly 180* (degrees) of the world known to the ancients. By mid-century, Mercator had abandoned the Ptolemaic prime meridian in favor of a meridian based on the point at which the compass showed no variation. muweb.millersville.edu /~columbus/data/geo/WASHBR04.GEO   (1786 words)

 Rough Science . Latitude and Longitude Challenge | PBS The Prime Meridian is the imaginary line running between the North and South Poles that's used to indicate 0° longitude. An international conference held in Washington D.C. in 1884 designated "the meridian passing through the center of the transit instrument at the Observatory of Greenwich as the initial meridian for longitude." During the 1950s, the Greenwich Observatory moved to Herstmonceux Castle in East Sussex, where the skies were deemed to be clearer. As the prime meridian, the north–south line at Greenwich is used as the reference point for all other meridians of longitude, which are numbered east or west of it. www.pbs.org /weta/roughscience/series1/challenges/latlong/page9.html   (282 words)

 Mars Global Surveyor MOC2-273 Release On Earth, the longitude of the Royal Observatory in Greenwich, England is defined as the "prime meridian," or the zero point of longitude. The prime meridian was defined by international agreement in 1884 as the position of the large "transit circle", a telescope in the Observatory's Meridian Building. For Mars, the prime meridian was first defined by the German astronomers W. Beer and J. Mädler in 1830-32. www.msss.com /mars_images/moc/01_31_01_releases/airy0   (586 words)

 Maps, prime meridian The prime meridian is the meridian of zero longitude, the base line from which longitude is measured; although usually called the first or prime meridian it is the zeroeth. The longitude of a place is the number of degrees (reckoned upon the equator) that the meridian of the said place is distant from the meridian of any other place from which we reckon, either eastward or westward, for 180 degrees, or half round the globe. The Island of St Mary in the Azores was used to define the prime meridian by Christopher Saxton, 1584. www.geog.port.ac.uk /webmap/hantsmap/hantsmap/meridian.htm   (1650 words)

 [No title] ] The reference meridian of a grid; in polar regions it is usually the 180-0° geographic meridian, used as the origin for measuring grid longitude. ] The meridian of longitude 0°, used as the origin for measurement of longitude; the meridian of Greenwich, England, is almost universally used for this purpose. The numerically smallest value of the arc sine, arc cosine, or arc tangent of a number, the positive value being chosen when there are values that are numerically equal but opposite in sign. www.accessscience.com /Dictionary/P/P43/DictP43.html   (2683 words)

 Prime Meridian Main Page Prime Meridian are a group of Architects and Structural Engineers with offices in Central London and the South West of England. Founded in 1989 Prime Meridian has gained extensive experience in a wide range of new and refurbishment projects. With projects ranging from small house additions to large historic building renovations, Prime Meridian has both the skill and the experience to take on any building design challenge. www.prime-meridian.co.uk /Mainpage.htm   (85 words)

 Meridian Arts Ensemble "Prime Meridian" "Prime Meridian: The longitude from which all other longitudes are reckoned either east or west. Prime Meridian features a daring and diverse collection of compositions by various 20th Century composers. At 70 minutes, Prime Meridian proves to be a fine addition to any collector interested in 20th Century composition. home.rochester.rr.com /preming1/Reviews/mae1.htm   (1218 words)

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