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A prime meridian is a meridian (a line of longitude) in a geographical coordinate system at which longitude is defined to be 0°. [1]

144 relations: Abraham Ortelius, Africa, Airy-0, Alexandria, Almagest, Amsterdam, Antipodes, Antwerp, Astronomer Royal, Atlantic Ocean, Azores, Bering Strait, Bern, Bologna, Bruce (crater), Brussels, Canary Islands, Cape Verde, Cardinal Richelieu, Charon (moon), Christopher Columbus, Christopher Saxton, Connaissance des Temps, Copenhagen, Den Store Danske Encyklopædi, Denotation (semiotics), Diogo Ribeiro, Earth, Easter Island, Eastern Hemisphere, Edmond Halley, El Hierro, Equator, Eratosthenes, Ferro Meridian, Florence, Florence meridian, Fortunate Isles, Fuerteventura, Gall–Peters projection, Geodetic datum, Geographer, Geographic coordinate system, Geography (Ptolemy), George Biddell Airy, Gerardus Mercator, Global Positioning System, Great circle, Great Pyramid of Giza, Greeks, ..., Greenwich, Guillaume Delisle, Hemispheres of the Earth, Hipparchus, IERS Reference Meridian, International Date Line, International Earth Rotation and Reference Systems Service, International Meridian Conference, International Terrestrial Reference System, International Time Bureau, Jacob Roggeveen, James Bradley, Jerusalem, John Flamsteed, John Hadley, John Harrison, Jupiter, Kyoto, Latitude, Lisbon, Longitude, Longitude (book), Lunar distance (navigation), Lunar eclipse, Madrid, Magnetic field, Maimonides, Marine chronometer, Mars, Mecca, Mecca Time, Meridian (geography), Meridian circle, Meridian of Antwerp, Minute and second of arc, Monte Mario, Moon, Naples, Nevil Maskelyne, North Pole, Octant (instrument), Oradea, Oslo, Paris, Paris meridian, Philadelphia, Pierre Janssen, Pisa, Plate tectonics, Plumb bob, Pluto, Portugal, Prime meridian (Greenwich), Ptolemy, Pulkovo Observatory, Rhodes, Richard Christopher Carrington, Rio de Janeiro, Rome, Royal Observatory, Greenwich, Rundetårn, Saint Petersburg, Sandford Fleming, São Miguel Island, Sea level, South Pole, Spain, Stockholm, Stockholm Observatory, Strabo, Submarine communications cable, Sunspot, Tenerife, Tenerife meridian, The Nautical Almanac, Thomas Godfrey (inventor), Titan (moon), Treaty of Tordesillas, Ujjain, United Kingdom Ordnance Survey Zero Meridian, United States, United States Department of Defense, Venus, Warsaw, Warsaw meridian, Washington meridian, Washington, D.C., Westerkerk, Western Hemisphere, Winchester, World Geodetic System, 180th meridian, 1st meridian east, 1st meridian west. Expand index (94 more) »

Abraham Ortelius

Abraham Ortelius (also Ortels, Orthellius, Wortels; 14 April 1527 – 28 June 1598) was a Flemish cartographer and geographer, conventionally recognized as the creator of the first modern atlas, the Theatrum Orbis Terrarum (Theatre of the World).

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Africa is the world's second-largest and second-most-populous continent.

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Airy-0 is a crater on Mars whose location defines the position of the prime meridian of that planet.

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Alexandria (or; اسكندرية, in Egyptian Arabic) is the second largest city and a major economic centre in Egypt, extending about along the coast of the Mediterranean Sea in the north central part of the country.

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The Almagest is a 2nd-century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths.

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Amsterdam is the capital city and most populous city of the Kingdom of the Netherlands.

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In geography, the antipodes (from Greek: ἀντίποδες, from anti- "opposed" and pous "foot") of any place on Earth is the point on the Earth's surface which is diametrically opposite to it.

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Antwerp (Antwerpen, Anvers) is a city in Belgium which is the capital of Antwerp province.

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Astronomer Royal

Astronomer Royal is a senior post in the Royal Households of the United Kingdom.

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Atlantic Ocean

The Atlantic Ocean is the second largest of the world's oceanic divisions, following the Pacific Ocean.

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The Azores (Açores), officially the Autonomous Region of the Azores (Região Autónoma dos Açores), is one of the two autonomous regions of Portugal, composed of nine volcanic islands situated in the North Atlantic Ocean about west of continental Portugal, about northwest of Madeira, about southeast of Newfoundland, and about northeast of Brazil.

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Bering Strait

The Bering Strait (Берингов пролив, Beringov proliv, Yupik: Imakpik) is a strait connecting the Pacific and Arctic oceans between Russia and the US state of Alaska.

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The city of Bern or Berne (Bern,; Berne; Berna; Berna; Bernese German: Bärn) is the de facto capital of Switzerland, referred to by the Swiss as their (e.g. in German) Bundesstadt, or "federal city".

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Bologna (Emilian: Bulåggna pronounced; Bononia) is the largest city (and the capital) of the Emilia-Romagna Region in Italy.

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Bruce (crater)

Bruce is a small lunar impact crater located in the Sinus Medii.

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Brussels (Bruxelles,; Brussel), officially the Brussels-Capital Region (All text and all but one graphic show the English name as Brussels-Capital Region.) (Région de Bruxelles-Capitale, Brussels Hoofdstedelijk Gewest), is a region of Belgium comprising 19 municipalities, including the city of Brussels which de jure is the capital of Belgium, the French Community of Belgium, and the Flemish Community.

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Canary Islands

The Canary Islands (Islas Canarias), also known as the Canaries (Canarias), are a Spanish archipelago located just off the southern coast of Morocco, west of its southern border.

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Cape Verde

Cape Verde or Cabo Verde (Cabo Verde), officially the Republic of Cabo Verde, is an island country spanning an archipelago of 10 volcanic islands in the central Atlantic Ocean.

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Cardinal Richelieu

Armand Jean du Plessis, Cardinal-Duke of Richelieu and of Fronsac (9 September 1585 – 4 December 1642), commonly referred to as Cardinal Richelieu (Cardinal de Richelieu), was a French clergyman, noble and statesman.

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Charon (moon)

Charon, also called (134340) Pluto I, is the largest of the five known moons of the dwarf planet Pluto.

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Christopher Columbus

Christopher Columbus (Cristoforo Colombo; Cristóbal Colón; Cristóvão Colombo; born between 31 October 1450 and 30 October 1451, Genoa; died 20 May 1506, Valladolid) was an Italian explorer, navigator, colonizer and citizen of the Republic of Genoa.

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Christopher Saxton

Christopher Saxton (c.1540 – c.1610) was an English cartographer who produced the first county maps of England and Wales.

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Connaissance des Temps

The Connaissance des temps (English: Knowledge of Time) is an official astronomical yearly publication in France.

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Copenhagen (København), historically known as the capital of the Denmark-Norway union, is the capital and most populated city of Denmark, with an urban population of 1,263,698 and a metropolitan population of 1,992,114.

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Den Store Danske Encyklopædi

Den Store Danske Encyklopædi (The Great Danish Encyclopedia) is the most comprehensive contemporary Danish language encyclopedia.

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Denotation (semiotics)

In semiotics, denotation is the surface or literal meaning encoded to a signifier, and the definition most likely to appear in a dictionary.

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Diogo Ribeiro

Diogo Ribeiro, also known as Diego Ribero, was a Portuguese cartographer and explorer who worked most of his life in Spain.

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Earth (also the world, in Greek: Gaia, or in Latin: Terra), is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life.

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Easter Island

Easter Island (Rapa Nui, Isla de Pascua) is a Chilean island in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian Triangle.

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Eastern Hemisphere

The Eastern Hemisphere is a geographical term for the half of the Earth that is east of the Prime Meridian (which crosses Greenwich, England, United Kingdom) and west of 180° longitude.

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Edmond Halley

Edmond (or Edmund) Halley, FRS (pronounced; 8 November 1656 – 14 January 1742) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist who is best known for computing the orbit of the eponymous Halley's Comet.

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El Hierro

El Hierro, nicknamed Isla del Meridiano (the "Meridian Island"), is the smallest and farthest south and west of the Canary Islands (an Autonomous Community of Spain), in the Atlantic Ocean off the coast of Africa, with a population of 10,162 (2003).

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An equator is the intersection of a sphere's surface with the plane perpendicular to the sphere's axis of rotation and midway between the poles.

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Eratosthenes of Cyrene (Ἐρατοσθένης,; –) was a Greek mathematician, geographer, poet, astronomer, and music theorist.

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Ferro Meridian

The line of longitude running through El Hierro (Ferro) was known in European history as the prime meridian in common use outside of the future British Empire.

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Florence (Firenze, alternative obsolete form: Fiorenza; Latin: Florentia) is the capital city of the Italian region of Tuscany and of the province of Florence.

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Florence meridian

The Meridian 11°15 East was proposed as prime meridian by Arno Peters in the Peters World Map.

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Fortunate Isles

The Fortunate Isles or Isles of the Blessed (μακάρων νῆσοι, makárôn nêsoi) were semi-legendary islands in the Atlantic Ocean, variously treated as a simple geographical location and as a winterless earthly paradise inhabited by the heroes of Greek mythology.

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Fuerteventura (loosely translated as "Strong Winds" or a corruption of the French term for "Great Adventure") is one of the Canary Islands, in the Atlantic Ocean off the coast of Africa, politically part of Spain.

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Gall–Peters projection

The Gall–Peters projection, named after James Gall and Arno Peters, is one specialization of a configurable equal-area map projection known as the equal-area cylindric or cylindrical equal-area projection.

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Geodetic datum

A Geodetic datum or geodetic system is a coordinate system, and a set of reference points, used to locate places on the Earth (or similar objects).

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A geographer is a scholar whose area of study is geography, the study of Earth's natural environment and human society.

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Geographic coordinate system

A geographic coordinate system is a coordinate system that enables every location on the Earth to be specified by a set of numbers or letters.

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Geography (Ptolemy)

The Geography (Γεωγραφικὴ Ὑφήγησις, Geōgraphikḕ Hyphḗgēsis, "Geographical Guidance"), also known by its Latin names as the Geographia and the Cosmographia, is a gazeteer, an atlas, and a treatise on cartography, compiling the geographical knowledge of the 2nd-century Roman Empire.

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George Biddell Airy

Sir George Biddell Airy, KCB, PRS (27 July 1801 – 2 January 1892) was an English mathematician and astronomer, Astronomer Royal from 1835 to 1881.

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Gerardus Mercator

Gerardus Mercator (born 5 March 1512 in Rupelmonde, County of Flanders (in modern Belgium), died 2 December 1594 in Duisburg, United Duchies of Jülich-Cleves-Berg, (modern-day Germany)) was a cartographer, philosopher and mathematician.

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Global Positioning System

The Global Positioning System (GPS) is a space-based navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.

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Great circle

A great circle, also known as an orthodrome or Riemannian circle, of a sphere is the intersection of the sphere and a plane which passes through the center point of the sphere.

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Great Pyramid of Giza

The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now El Giza, Egypt.

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The Greeks or Hellenes (Έλληνες) are an ethnic group native to Greece, Cyprus, Albania, Anatolia, Southern Italy, and other regions. They also form a significant diaspora, with Greek communities established around the world. Greek colonies and communities have been historically established on the shores of the Mediterranean Sea and Black Sea, but the Greek people have always been centered around the Aegean and Ionian seas, where the Greek language has been spoken since the Bronze Age. Until the early 20th century, Greeks were distributed between the Greek peninsula, the western coast of Asia Minor, the Black Sea coast, Cappadocia in central Anatolia, Egypt, the Balkans, Cyprus, and Constantinople. Many of these regions coincided to a large extent with the borders of the Byzantine Empire of the late 11th century and the Eastern Mediterranean areas of ancient Greek colonization. The cultural centers of the Greeks have included Athens, Thessalonica, Alexandria, Smyrna, and Constantinople at various periods. Most ethnic Greeks live nowadays within the borders of the modern Greek state and Cyprus. The Greek genocide and population exchange between Greece and Turkey nearly ended the three millennia-old Greek presence in Asia Minor. Other longstanding Greek populations can be found from southern Italy to the Caucasus and southern Russia and Ukraine and in the Greek diaspora communities in a number of other countries. Today, most Greeks are officially registered as members of the Greek Orthodox Church.CIA World Factbook on Greece: Greek Orthodox 98%, Greek Muslim 1.3%, other 0.7%. Greeks have greatly influenced and contributed to culture, arts, exploration, literature, philosophy, politics, architecture, music, mathematics, science and technology, business, cuisine, and sports, both historically and contemporarily.

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Greenwich is an early-established district of today's London, England, and the administrative centre of the Royal Borough of Greenwich centred 5.5 miles (8.9 km) east south-east of Charing Cross.

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Guillaume Delisle

Guillaume Delisle, also spelled Guillaume de l'Isle, (28 February 1675, Paris - 25 January 1726, Paris) was a French cartographer known for his popular and accurate maps of Europe and the newly explored Americas and Africa.

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Hemispheres of the Earth

The Hemispheres of the Earth in geography and cartography refer to any division of the globe into 2 hemispheres (from Ancient Greek ἡμισφαίριον hēmisphairion meaning "half of a sphere").

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Hipparchus of Nicaea (Ἵππαρχος, Hipparkhos), was a Greek astronomer, geographer, and mathematician.

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IERS Reference Meridian

The IERS Reference Meridian (IRM), also called the International Reference Meridian, is the prime meridian (0° longitude) maintained by the International Earth Rotation and Reference Systems Service (IERS).

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International Date Line

The International Date Line (IDL) is an imaginary line on the surface of the Earth that runs from the north pole to the south pole and demarcates the change of one calendar day to the next.

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International Earth Rotation and Reference Systems Service

The International Earth Rotation and Reference Systems Service (IERS), formerly the International Earth Rotation Service, is the body responsible for maintaining global time and reference frame standards, notably through its Earth Orientation Parameter (EOP) and International Celestial Reference System (ICRS) groups.

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International Meridian Conference

The International Meridian Conference was a conference held in October 1884 in Washington, D.C., in the United States, to determine a prime meridian for international use.

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International Terrestrial Reference System

The International Terrestrial Reference System (ITRS) describes procedures for creating reference frames suitable for use with measurements on or near the Earth's surface.

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International Time Bureau

The International Time Bureau (Bureau International de l'Heure, abbreviated BIH) seated at the Paris Observatory, was the international bureau responsible for combining different measurements of Universal Time.

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Jacob Roggeveen

Jacob Roggeveen (1 February 1659 – 31 January 1729) was a Dutch explorer who was sent to find Terra Australis, but he instead came across Easter Island.

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James Bradley

James Bradley FRS (March 1693 – 13 July 1762) was an English astronomer and served as Astronomer Royal from 1742, succeeding Edmond Halley.

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Jerusalem (יְרוּשָׁלַיִם; القُدس), located on a plateau in the Judean Mountains between the Mediterranean and the Dead Sea, is one of the oldest cities in the world.

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John Flamsteed

John Flamsteed FRS (19 August 1646 – 31 December 1719) was an English astronomer and the first Astronomer Royal.

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John Hadley

John Hadley (16 April 1682 – 14 February 1744) was an English mathematician, and laid claim to the invention of the octant, two years after Thomas Godfrey claimed the same.

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John Harrison

John Harrison (– 24 March 1776) was a self-educated English carpenter and clockmaker.

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Jupiter is the fifth planet from the Sun and the largest planet in the Solar System.

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, formerly known as Meaco, is a city located in the central part of the island of Honshu, Japan.

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In geography, latitude (φ) is a geographic coordinate that specifies the north-south position of a point on the Earth's surface.

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Lisbon (Lisboa) is the capital and the largest city of Portugal, with a population of 552,700, Census 2011 results according to the 2013 administrative division of Portugal within its administrative limits in an area of 100.05 km².

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Longitude (or, British also), is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.

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Longitude (book)

Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time is a best-selling book by Dava Sobel about John Harrison, an 18th-century clockmaker who created the first clock (chronometer) sufficiently accurate to be used to determine longitude at sea—an important development in navigation.

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Lunar distance (navigation)

In celestial navigation, lunar distance is the angle between the Moon and another celestial body.

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Lunar eclipse

A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow).

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Madrid is a south-western European city and the capital and largest municipality of Spain.

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Magnetic field

A magnetic field is the magnetic effect of electric currents and magnetic materials.

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Moshe ben Maimon (משה בן-מימון), or Mūsā ibn Maymūn (موسى بن ميمون), acronymed Rambam (רמב"ם – for "Rabbeinu Moshe Ben Maimon", "Our Rabbi/Teacher Moses Son of Maimon"), and Latinized Moses Maimonides, a preeminent medieval Sephardic Jewish philosopher and astronomer, became one of the most prolific and influential Torah scholars and physicians of the Middle Ages.

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Marine chronometer

A marine chronometer is a timepiece that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation.

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Mars is the fourth planet from the Sun and the second smallest planet in the Solar System, after Mercury.

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Mecca (مكة), also transliterated Makkah, is a city in the Hejaz in Saudi Arabia.

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Mecca Time

Mecca Time was a proposed time standard that uses the line of longitude that goes through Mecca, Saudi Arabia (39°49′34″ E of the Greenwich Meridian) as its Prime Meridian.

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Meridian (geography)

A meridian (or line of longitude) is any great circle line on the Earth's surface, passing through the North Pole and the South Pole.

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Meridian circle

The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a transit, while at the same time measuring their angular distance from the nadir.

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Meridian of Antwerp

The meridan of Antwerp is one of several prime meridians that have been used for geographic referencing.

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Minute and second of arc

A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree.

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Monte Mario

Monte Mario is the highest (139 m) hill in Rome, Italy.

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The Moon (in Greek: Selene, in Latin: Luna) is Earth's only natural satellite.

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Naples (Napoli, Neapolitan: nNapule; Neapolis; Νεάπολις, meaning "new city") is the capital of the Italian region Campania and the third-largest municipality in Italy, after Rome and Milan.

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Nevil Maskelyne

The Reverend Dr Nevil Maskelyne FRS (6 October 1732 – 9 February 1811) was the fifth British Astronomer Royal.

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North Pole

The North Pole, also known as the Geographic North Pole, Celestial North Pole, or Terrestrial North Pole, is (subject to the caveats explained below) defined as the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.

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Octant (instrument)

The octant, also called reflecting quadrant, is a measuring instrument used primarily in navigation.

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Oradea (Großwardein, Nagyvárad, Hungarian pronunciation:, colloquially also Várad, former Varat, גרויסווארדיין Groysvardeyn) the capital city of Bihor County and Crișana region, is one of the important centers of economic, social and cultural development in the western part of Romania, retaining these characteristics throughout history.

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Oslo (or, rarer or) is the capital and the most populous city in Norway.

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Paris (UK:; US:; French) is the capital and most-populous city of France.

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Paris meridian

The Paris meridian is a meridian line running through the Paris Observatory in Paris, France—now longitude 2°20′14.03″ east.

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Philadelphia is the largest city in the U.S. state of Pennsylvania and the fifth-most-populous in the United States.

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Pierre Janssen

Pierre Jules César Janssen (22 February 1824 – 23 December 1907), also known as Jules Janssen, was a French astronomer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium.

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Pisa is a city in Tuscany, Central Italy, straddling the River Arno just before it empties into the Tyrrhenian Sea.

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Plate tectonics

Plate tectonics (from the Late Latin tectonicus, from the τεκτονικός "pertaining to building") is a scientific theory that describes the large-scale motion of Earth's lithosphere.

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Plumb bob

A plumb-bob or a plummet is a weight, usually with a pointed tip on the bottom, that is suspended from a string and used as a vertical reference line, or plumb-line.

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Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.

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Portugal, officially the Portuguese Republic (República Portuguesa), is a country on the Iberian Peninsula, in southwestern Europe.

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Prime meridian (Greenwich)

A prime meridian, based at the Royal Observatory, Greenwich, in London, was established by Sir George Airy in 1851.

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Claudius Ptolemy (Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos,; Claudius Ptolemaeus) was a Greco-Egyptian writer of Alexandria, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.

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Pulkovo Observatory

The Pulkovo Astronomical Observatory (Пу́лковская астрономи́ческая обсервато́рия, official name The Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, Гла́вная (Пу́лковская) астрономи́ческая обсервато́рия Росси́йской акаде́мии нау́к), the principal astronomical observatory of the Russian Academy of Sciences, located 19 km south of Saint Petersburg on Pulkovo Heights above sea level.

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Rhodes (Ρόδος, Ródos) is the largest of the Dodecanese islands in terms of land area and also the island group's historical capital.

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Richard Christopher Carrington

Richard Christopher Carrington (26 May 1826 – 27 November 1875) was an English amateur astronomer whose 1859 astronomical observations demonstrated the existence of solar flares as well as suggesting their electrical influence upon the Earth and its aurorae; and whose 1863 records of sunspot observations revealed the differential rotation of the Sun.

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Rio de Janeiro

Rio de Janeiro (January River), or simply Rio, is the second-largest city in Brazil, the sixth-largest city in the Americas, and the world's thirty-fifth-largest city by population.

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Rome (Roma, Rōma) is a city and special comune (named "Roma Capitale") in Italy.

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Royal Observatory, Greenwich

The Royal Observatory, Greenwich, (known as the Royal Greenwich Observatory or RGO when the working institution moved from Greenwich to Herstmonceux after World War II) played a major role in the history of astronomy and navigation, and is best known as the location of the prime meridian.

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The Rundetårn (English: Round Tower) is a 17th-century tower located in central Copenhagen, Denmark.

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Saint Petersburg

Saint Petersburg (p) is the second largest city in Russia, politically incorporated as a federal subject (a federal city).

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Sandford Fleming

Sir Sandford Fleming, (January 7, 1827 – July 22, 1915) was a Scottish-born Canadian engineer and inventor.

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São Miguel Island

São Miguel Island (named for the Archangel Michael or, literally, Portuguese for Saint Michael), is also referred to locally as "The Green Island", is the largest and most populous island in the Portuguese archipelago of the Azores.

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Sea level

Sea level is generally used to refer to mean sea level (MSL), an average level for the surface of one or more of Earth's oceans from which heights such as elevations may be measured.

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South Pole

The South Pole, also known as the Geographic South Pole, Celestial South Pole, or Terrestrial South Pole, is one of the two points where the Earth's axis of rotation intersects its surface (also see Celestial pole).

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Spain (España), officially the Kingdom of Spain (Reino de España), is a sovereign state located on the Iberian Peninsula in southwestern Europe.

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Stockholm () is the capital of Sweden and the most populous city in the Nordic region, with 914,909 people living in the municipality, approximately 1.4 million in the urban area, and 2.2 million in the metropolitan area.

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Stockholm Observatory

The Stockholm Observatory (Swedish: Stockholms observatorium) is an astronomical institution in Stockholm, Sweden, founded in the 18th century and today part of Stockholm University.

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Strabo (Στράβων Strabōn; 64/63 BC – c. AD 24), was a Greek geographer, philosopher, and historian.

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Submarine communications cable

A submarine communications cable is a cable laid on the sea bed between land-based stations to carry telecommunication signals across stretches of ocean.

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Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions.

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Tenerife is the largest and most populous island of the seven Canary Islands; it is also the most populated island of Spain, with a land area of and 898,680 inhabitants, 43 percent of the total population of the Canary Islands.

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Tenerife meridian

The Tenerife meridian was the prime meridian of choice for Dutch cartographers and navigators from the 1640s until the beginning of the 19th century.

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The Nautical Almanac

The Nautical Almanac has been the familiar name for a series of official British almanacs published under various titles since the first issue of The Nautical Almanac and Astronomical Ephemeris, for 1767: this was the first nautical almanac ever to contain data dedicated to the convenient determination of longitude at sea.

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Thomas Godfrey (inventor)

Thomas Godfrey (December 1704 – December 1749) was an optician and inventor in the American colonies, who around 1730 invented the octant.

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Titan (moon)

Titan (or Saturn VI) is the largest moon of Saturn.

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Treaty of Tordesillas

The Treaty of Tordesillas (Tratado de Tordesilhas, Tratado de Tordesillas), signed at Tordesillas on June 7, 1494, and authenticated at Setúbal, Portugal, divided the newly discovered lands outside Europe between Portugal and the Crown of Castile, along a meridian 370 leagues west of the Cape Verde islands, off the west coast of Africa.

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Ujjain (also known as Ujain, Ujjayini, Avanti, Avantika, Avantikapuri), is an ancient city situated on the eastern bank of the Kshipra River (Hindi: क्षिप्रा) in the Malwa region of central India.

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United Kingdom Ordnance Survey Zero Meridian

The United Kingdom Ordnance Survey Zero Meridian is the prime meridian used by the Ordnance Survey (OSGB36 datum).

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United States

The United States of America (USA), commonly referred to as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major territories and various possessions.

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United States Department of Defense

The Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government of the United States charged with coordinating and supervising all agencies and functions of the government concerned directly with national security and the United States Armed Forces.

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Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.

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Warsaw (Warszawa; see also other names) is the capital and largest city of Poland.

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Warsaw meridian

The Warsaw meridian (południk warszawski) is a meridian line running through Warsaw.

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Washington meridian

The Washington meridians are four meridians that were used as prime meridians in the United States and pass through Washington, D.C..

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Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as "Washington", "the District", or simply "D.C.", is the capital of the United States.

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Westerkerk (Western Church) is a Dutch Protestant church in central Amsterdam in the Netherlands.

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Western Hemisphere

The Western Hemisphere is a geographical term for the half of the Earth that lies west of the Prime Meridian (which crosses Greenwich, London, United Kingdom) and east of the Antimeridian, the other half being called the Eastern Hemisphere.

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Winchester is a city and the county town of Hampshire.

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World Geodetic System

The World Geodetic System (WGS) is a standard for use in cartography, geodesy, and navigation including by GPS.

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180th meridian

The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle.

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1st meridian east

The meridian 1° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Atlantic Ocean, Europe, Africa, the Southern Ocean, and Antarctica to the South Pole.

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1st meridian west

The meridian 1° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Atlantic Ocean, Europe, Africa, the Southern Ocean, and Antarctica to the South Pole.

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Redirects here:

0 Longitude, 0-E, 0° longitude, History of prime meridians, Prime Meridian, Prime meridian (planets), Universal prime meridian, Zero meridian.


[1] https://en.wikipedia.org/wiki/Prime_meridian

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