Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another. The field of navigation includes four general categories: land navigation, marine navigation , aeronautic navigation, and space navigation.
123-511: Weriyeng (also spelled "Warieng") is one of the last two schools of traditional navigation found in the central Caroline Islands in Micronesia , the other being Fanur . By tradition these two schools were considered to be the most high of all the schools of navigation that once dotted the islands of the central Carolines. By tradition the Weriyeng school was founded on the island of Pulap , which
246-421: A nautical almanac , can be used to calculate the time at zero longitude (see Greenwich Mean Time ). Reliable marine chronometers were unavailable until the late 18th century and not affordable until the 19th century. For about a hundred years, from about 1767 until about 1850, mariners lacking a chronometer used the method of lunar distances to determine Greenwich time to find their longitude. A mariner with
369-433: A sextant and using sight reduction tables to correct for height of eye and atmospheric refraction. The height of Polaris in degrees above the horizon is the latitude of the observer, within a degree or so. Similar to latitude, the longitude of a place on Earth is the angular distance east or west of the prime meridian or Greenwich meridian . Longitude is usually expressed in degrees (marked with °) ranging from 0° at
492-702: A Portuguese expedition commanded by Vasco da Gama reached India by sailing around Africa, opening up direct trade with Asia . Soon, the Portuguese sailed further eastward, to the Spice Islands in 1512, landing in China one year later. The first circumnavigation of the earth was completed in 1522 with the Magellan-Elcano expedition , a Spanish voyage of discovery led by Portuguese explorer Ferdinand Magellan and completed by Spanish navigator Juan Sebastián Elcano after
615-500: A South Asian country, emerges as one of the world's fastest movers since 1970 mainly due to health and education achievements. Its present life expectancy is 25 years longer than in the 1970s. More than four of every five children of school age in Nepal now attend primary school, compared to just one in five 40 years ago. Hong Kong ranked highest among the countries grouped on the HDI (number 7 in
738-691: A chronometer could check its reading using a lunar determination of Greenwich time. In navigation, a rhumb line (or loxodrome) is a line crossing all meridians of longitude at the same angle, i.e. a path derived from a defined initial bearing. That is, upon taking an initial bearing, one proceeds along the same bearing, without changing the direction as measured relative to true or magnetic north. Most modern navigation relies primarily on positions determined electronically by receivers collecting information from satellites. Most other modern techniques rely on finding intersecting lines of position or LOP. A line of position can refer to two different things, either
861-478: A distance produces a circle or arc of position. Circles, arcs, and hyperbolae of positions are often referred to as lines of position. If the navigator draws two lines of position, and they intersect he must be at that position. A fix is the intersection of two or more LOPs. If only one line of position is available, this may be evaluated against the dead reckoning position to establish an estimated position. Lines (or circles) of position can be derived from
984-587: A few meters using time signals transmitted along a line of sight by radio from satellites . Receivers on the ground with a fixed position can also be used to calculate the precise time as a reference for scientific experiments. As of October 2011, only the United States NAVSTAR Global Positioning System (GPS) and the Russian GLONASS are fully globally operational GNSSs. The European Union 's Galileo positioning system
1107-402: A line on a chart or a line between the observer and an object in real life. A bearing is a measure of the direction to an object. If the navigator measures the direction in real life, the angle can then be drawn on a nautical chart and the navigator will be somewhere on that bearing line on the chart. In addition to bearings, navigators also often measure distances to objects. On the chart,
1230-659: A major hub for outsourcing. Trade between Asian countries and countries on other continents is largely carried out on the sea routes that are important for Asia. Individual main routes have emerged from this. The main route leads from the Chinese coast south via Hanoi to Jakarta, Singapore and Kuala Lumpur through the Strait of Malacca via the Sri Lankan Colombo to the southern tip of India via Malé to East Africa Mombasa (see also: Indo-Pacific ), from there to Djibouti , then through
1353-567: A marsh or lowland containing a marsh in Lydia as ασιος . The term was later adopted by the Romans , who used it in reference to the province of Asia , located in western Anatolia. One of the first writers to use Asia as a name of the whole continent was Pliny . The history of Asia can be seen as the distinct histories of several peripheral coastal regions: East Asia , South Asia , Southeast Asia , Central Asia , and West Asia . The coastal periphery
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#17328450209641476-679: A mix of many different climates ranging from the equatorial south via the hot deserts in parts of West Asia , Central Asia and South Asia , temperate areas in the east and the continental centre to vast subarctic and polar areas in North Asia . The boundary between Asia and Africa is the Suez Canal , the Gulf of Suez , the Red Sea , and the Bab-el-Mandeb . This makes Egypt a transcontinental country , with
1599-450: A number of stars in succession to give a series of overlapping lines of position. Where they intersect is the celestial fix. The Moon and Sun may also be used. The Sun can also be used by itself to shoot a succession of lines of position (best done around local noon) to determine a position. In order to accurately measure longitude, the precise time of a sextant sighting (down to the second, if possible) must be recorded. Each second of error
1722-399: A particularly good navigation system for ships and aircraft that might be flying at a distance from land. RDFs works by rotating a directional antenna and listening for the direction in which the signal from a known station comes through most strongly. This sort of system was widely used in the 1930s and 1940s. RDF antennas are easy to spot on German World War II aircraft, as loops under
1845-418: A radio time signal. Times and frequencies of radio time signals are listed in publications such as Radio Navigational Aids . The second critical component of celestial navigation is to measure the angle formed at the observer's eye between the celestial body and the sensible horizon. The sextant, an optical instrument, is used to perform this function. The sextant consists of two primary assemblies. The frame
1968-400: A single object," "two or more bearings," "tangent bearings," and "two or more ranges." Radar can also be used with ECDIS as a means of position fixing with the radar image or distance/bearing overlaid onto an Electronic nautical chart . Parallel indexing is a technique defined by William Burger in the 1957 book The Radar Observer's Handbook . This technique involves creating a line on
2091-537: A spectrum. China and India traded places as the largest economies in the world from 1 to 1800 CE. China was a major economic power for much of recorded history, with the highest GDP per capita until 1500. The Silk Road became the main east–west trading route in the Asian hinterlands while the Straits of Malacca stood as a major sea route. Asia has exhibited economic dynamism as well as robust population growth during
2214-404: A sufficient depth of water below the hull as well as a consideration for squat . It may also involve navigating a ship within a river, canal or channel in close proximity to land. A military navigation team will nearly always consist of several people. A military navigator might have bearing takers stationed at the gyro repeaters on the bridge wings for taking simultaneous bearings, while
2337-413: A variety of sources: There are some methods seldom used today such as "dipping a light" to calculate the geographic range from observer to lighthouse. Methods of navigation have changed through history. Each new method has enhanced the mariner's ability to complete his voyage. One of the most important judgments the navigator must make is the best method to use. Some types of navigation are depicted in
2460-449: Is Pulsar navigation , which compares the X-ray bursts from a collection of known pulsars in order to determine the position of a spacecraft. This method has been tested by multiple space agencies, such as NASA and ESA . A radio direction finder or RDF is a device for finding the direction to a radio source. Due to radio's ability to travel very long distances "over the horizon", it makes
2583-572: Is a next generation GNSS in the final deployment phase, and became operational in 2016. China has indicated it may expand its regional Beidou navigation system into a global system. Asia Asia ( / ˈ eɪ ʒ ə / AY -zhə , UK also / ˈ eɪ ʃ ə / AY -shə ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometers, about 30% of Earth 's total land area and 8% of Earth's total surface area. The continent, which has long been home to
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#17328450209642706-436: Is a quartz crystal oscillator. The quartz crystal is temperature compensated and is hermetically sealed in an evacuated envelope. A calibrated adjustment capability is provided to adjust for the aging of the crystal. The chronometer is designed to operate for a minimum of one year on a single set of batteries. Observations may be timed and ship's clocks set with a comparing watch, which is set to chronometer time and taken to
2829-425: Is a rigid triangular structure with a pivot at the top and a graduated segment of a circle, referred to as the "arc", at the bottom. The second component is the index arm, which is attached to the pivot at the top of the frame. At the bottom is an endless vernier which clamps into teeth on the bottom of the "arc". The optical system consists of two mirrors and, generally, a low power telescope. One mirror, referred to as
2952-1027: Is considered to be the V-2 guidance system deployed by the Germans in 1942. However, inertial sensors are traced to the early 19th century. The advantages INSs led their use in aircraft, missiles, surface ships and submarines. For example, the U.S. Navy developed the Ships Inertial Navigation System (SINS) during the Polaris missile program to ensure a reliable and accurate navigation system to initial its missile guidance systems. Inertial navigation systems were in wide use until satellite navigation systems (GPS) became available. INSs are still in common use on submarines (since GPS reception or other fix sources are not possible while submerged) and long-range missiles. Not to be confused with satellite navigation, which depends upon satellites to function, space navigation refers to
3075-441: Is equivalent to 15 seconds of longitude error, which at the equator is a position error of .25 of a nautical mile, about the accuracy limit of manual celestial navigation. The spring-driven marine chronometer is a precision timepiece used aboard ship to provide accurate time for celestial observations. A chronometer differs from a spring-driven watch principally in that it contains a variable lever device to maintain even pressure on
3198-1011: Is generally defined as comprising the eastern four-fifths of Eurasia. It is located to the east of the Suez Canal and the Ural Mountains , and south of the Caucasus Mountains (or the Kuma–Manych Depression ) and the Caspian and Black Seas . It is bounded on the east by the Pacific Ocean , on the south by the Indian Ocean and on the north by the Arctic Ocean. Asia is subdivided into 49 countries, five of them ( Georgia , Azerbaijan , Russia , Kazakhstan and Turkey ) are transcontinental countries lying partly in Europe . Geographically, Russia
3321-506: Is growing rapidly. In 2010, Asia had 3.3 million millionaires (people with net worth over US$ 1 million excluding their homes), slightly below North America with 3.4 million millionaires. In 2011, Asia topped Europe in number of millionaires. Citigroup in The Wealth Report 2012 stated that Asian centa-millionaire overtook North America's wealth for the first time as the world's "economic center of gravity" continued moving east. At
3444-462: Is moist across southeast sections, and dry across much of the interior. Some of the largest daily temperature ranges on Earth occur in western sections of Asia. The monsoon circulation dominates across southern and eastern sections, due to the presence of the Himalayas forcing the formation of a thermal low which draws in moisture during the summer. Southwestern sections of the continent are hot. Siberia
3567-478: Is not affected by adverse weather conditions and it cannot be detected or jammed. Its disadvantage is that since the current position is calculated solely from previous positions and motion sensors, its errors are cumulative, increasing at a rate roughly proportional to the time since the initial position was input. Inertial navigation systems must therefore be frequently corrected with a location 'fix' from some other type of navigation system. The first inertial system
3690-569: Is one of the coldest places in the Northern Hemisphere , and can act as a source of arctic air masses for North America. The most active place on Earth for tropical cyclone activity lies northeast of the Philippines and south of Japan. Climate change is particularly important in Asia, as the continent accounts for the majority of the human population. Warming since the 20th century is increasing
3813-449: Is particularly useful due to their high power and location near major cities. Decca , OMEGA , and LORAN-C are three similar hyperbolic navigation systems. Decca was a hyperbolic low frequency radio navigation system (also known as multilateration ) that was first deployed during World War II when the Allied forces needed a system which could be used to achieve accurate landings. As
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3936-699: Is partly in Asia, but is considered a European nation , both culturally and politically. The Gobi Desert is in Mongolia and the Arabian Desert stretches across much of the Middle East. The Yangtze in China is the longest river in the continent. The Himalayas between Nepal and China is the tallest mountain range in the world. Tropical rainforests stretch across much of southern Asia and coniferous and deciduous forests lie farther north. There are various approaches to
4059-485: Is probably the earliest form of open-ocean navigation; it was based on memory and observation recorded on scientific instruments like the Marshall Islands Stick Charts of Ocean Swells . Early Pacific Polynesians used the motion of stars, weather, the position of certain wildlife species, or the size of waves to find the path from one island to another. Maritime navigation using scientific instruments such as
4182-486: Is projected to move to third place, behind China and India. While nearly half of the world's new renewable energy capacity is built in Asia, this is not yet sufficient in order to meet the goals of the Paris Agreement . They imply that the renewables would account for 35% of total energy consumption in Asia by 2030. Asia has the largest continental economy in the world by both GDP nominal and PPP values, and
4305-455: Is reasonable for the navigator to simply monitor the progress of the ship along the chosen track, visually ensuring that the ship is proceeding as desired, checking the compass, sounder and other indicators only occasionally. If a pilot is aboard, as is often the case in the most restricted of waters, his judgement can generally be relied upon, further easing the workload. But should the ECDIS fail,
4428-429: Is the fastest growing economic region. As of 2023 , China is by far the largest economy on the continent, making up nearly half of the continent's economy by GDP nominal. It is followed by Japan, India, South Korea, Indonesia, Saudi Arabia and Turkey, which are all ranked among the top 20 largest economies both by nominal and PPP values. Based on Global Office Locations 2011, Asia dominated the office locations with 4 of
4551-560: Is today in the Pattiw region of Chuuk State , Federated States of Micronesia . Mau Piailug is one of the most famous navigators of this school. He trained the well-known modern Hawaiian wayfinder Nainoa Thompson . This Federated States of Micronesia article is a stub . You can help Misplaced Pages by expanding it . Navigation It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating
4674-553: The Age of Discovery . The earliest known description of how to make and use a sea astrolabe comes from Spanish cosmographer Martín Cortés de Albacar 's Arte de Navegar ( The Art of Navigation ) published in 1551, based on the principle of the archipendulum used in constructing the Egyptian pyramids . Open-seas navigation using the astrolabe and the compass started during the Age of Discovery in
4797-565: The Arctic Ocean . The border of Asia with Europe is a historical and cultural construct , as there is no clear physical and geographical separation between them. A commonly accepted division places Asia to the east of the Suez Canal separating it from Africa; and to the east of the Turkish straits , the Ural Mountains and Ural River , and to the south of the Caucasus Mountains and the Caspian and Black seas, separating it from Europe. Since
4920-776: The Black Sea coast, through the Surami Pass and along the Kura River to the Caspian Sea), a convention still followed by Herodotus in the 5th century BCE. During the Hellenistic period , this convention was revised, and the boundary between Europe and Asia was now considered to be the Tanais (the modern Don River). This is the convention used by Roman era authors such as Posidonius , Strabo and Ptolemy . The border between Asia and Europe
5043-577: The European Union (EU), the North American Free Trade Agreement (NAFTA) or APEC ). This ended in 2010 when China overtook Japan to become the world's second largest economy. It is forecasted that India will overtake Japan in terms of nominal GDP by 2027. In the late 1980s and early 1990s, Japan's GDP by currency exchange rates was almost as large as that of the rest of Asia combined. In 1995, Japan's economy nearly equaled that of
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5166-703: The Hebrew Bible in the narrative of Noah —and later to Christians in the Old Testament , and to Muslims in the Quran —is earliest found in Mesopotamian mythology , in the Enûma Eliš and Epic of Gilgamesh . Hindu mythology similarly tells about an avatar of Vishnu in the form of a fish who warned Manu of a terrible flood. Ancient Chinese mythology also tells of a Great Flood spanning generations, one that required
5289-615: The Hindu Kush region will become more unstable as its enormous glaciers , known as the "Asian water towers", gradually melt. These changes to water cycle also affect vector-borne disease distribution, with malaria and dengue fever expected to become more prominent in the tropical and subtropical regions. Food security will become more uneven, and South Asian countries could experience significant impacts from global food price volatility. Historical emissions from Asia are lower than those from Europe and North America. However, China has been
5412-667: The Sinai peninsula in Asia and the remainder of the country in Africa. The threefold division of the Old World into Africa, Asia, and Europe has been in use since the 6th century BCE, due to Greek geographers such as Anaximander and Hecataeus . Anaximander placed the boundary between Asia and Europe along the Phasis River (the modern Rioni river) in Georgia of Caucasus (from its mouth by Poti on
5535-537: The United States in cooperation with six partner nations. OMEGA was developed by the United States Navy for military aviation users. It was approved for development in 1968 and promised a true worldwide oceanic coverage capability with only eight transmitters and the ability to achieve a four-mile (6 km) accuracy when fixing a position. Initially, the system was to be used for navigating nuclear bombers across
5658-870: The Ural River prevailed in the mid-19th century. The border had been moved perforce from the Black Sea to the Caspian Sea into which the Ural River projects. The border between the Black Sea and the Caspian is usually placed along the crest of the Caucasus Mountains , although it is sometimes placed further north. The border between Asia and Oceania is usually placed somewhere in the Indonesia Archipelago , specifically in Eastern Indonesia . The Wallace Line separates
5781-578: The century of humiliation , with the British-supported opium trade and later Opium Wars resulting in China being forced into an unprecedented situation of importing more than it exported. Foreign domination of China was furthered by the Japanese colonial empire , which controlled some of East Asia and briefly much of Southeast Asia (which had earlier been taken over by the British, Dutch and French in
5904-620: The mariner's astrolabe first occurred in the Mediterranean during the Middle Ages. Although land astrolabes were invented in the Hellenistic period and existed in classical antiquity and the Islamic Golden Age , the oldest record of a sea astrolabe is that of Spanish astronomer Ramon Llull dating from 1295. The perfecting of this navigation instrument is attributed to Portuguese navigators during early Portuguese discoveries in
6027-638: The monsoons will experience more flooding. The waters around Asia are subjected to the same impacts as elsewhere, such as the increased warming and ocean acidification . There are many coral reefs in the region, and they are highly vulnerable to climate change, to the point practically all of them will be lost if the warming exceeds 1.5 °C (2.7 °F). Asia's distinctive mangrove ecosystems are also highly vulnerable to sea level rise . Asia also has more countries with large coastal populations than any other continent, which would cause large economic impacts from sea level rise. Water supplies in
6150-540: The steppes . The earliest postulated expansion out of the steppe is that of the Indo-Europeans , who spread their languages into West Asia, South Asia, and the borders of China, where the Tocharians resided. The northernmost part of Asia, including much of Siberia , was largely inaccessible to the steppe nomads, owing to the dense forests, climate and tundra . These areas remained very sparsely populated. The center and
6273-400: The "index mirror" is fixed to the top of the index arm, over the pivot. As the index arm is moved, this mirror rotates, and the graduated scale on the arc indicates the measured angle ("altitude"). The second mirror, referred to as the "horizon glass", is fixed to the front of the frame. One half of the horizon glass is silvered and the other half is clear. Light from the celestial body strikes
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#17328450209646396-765: The 15th century. The Portuguese began systematically exploring the Atlantic coast of Africa from 1418, under the sponsorship of Prince Henry . In 1488 Bartolomeu Dias reached the Indian Ocean by this route. In 1492 the Spanish monarchs funded Christopher Columbus 's expedition to sail west to reach the Indies by crossing the Atlantic, which resulted in the Discovery of the Americas . In 1498,
6519-730: The 17th century, the Manchu conquered China and established the Qing dynasty . The Islamic Mughal Empire (preceded by the Delhi Sultanate of the 13th to early 16th century) and the Hindu Maratha Empire controlled much of India in the 16th and 18th centuries respectively. Western imperialism in Asia from the 18th to 20th centuries coincided with the Industrial Revolution in the West and
6642-416: The 1990s, with extreme poverty now below 20%; India and China's rise has coincided with growing tension between the two, with the Indo-Pacific now an actively contested area between China and counterbalancing forces. Asia is the largest continent on Earth. It covers 9% of the Earth's total surface area (or 30% of its land area), and has the longest coastline, at 62,800 kilometres (39,022 mi). Asia
6765-468: The 20th century, but overall population growth has since fallen. Asia was the birthplace of most of the world's mainstream religions including Hinduism , Zoroastrianism , Judaism , Jainism , Buddhism , Confucianism , Taoism , Christianity , Islam , Sikhism , and many other religions. Asia varies greatly across and within its regions with regard to ethnic groups, cultures, environments, economics, historical ties, and government systems. It also has
6888-466: The 7th century; Islam also spread over centuries to the southern regions of India and Southeast Asia through trade along the Maritime Silk Road . The Mongol Empire conquered a large part of Asia in the 13th century, an area extending from China to Europe. Before the Mongol invasion, Song dynasty reportedly had approximately 120 million citizens; the 1300 census which followed the invasion reported roughly 60 million people. The Black Death , one of
7011-427: The Asian and Wallacea biogeographical realms, a transition zone of deep water straits between the Asian and Australian continental shelves. Weber's Line split the region in two with regard to the balance of fauna between Asian origin or Australo-Papuan origin. Wallacea's eastern boundary with Sahul is represented by the Lydekker's Line . The Maluku Islands (except the Aru Islands) are often considered to lie on
7134-441: The Asian goods traffic is carried out across the Pacific towards Los Angeles and Long Beach . The melting of the Arctic is also paving the way for new shipping routes from Northeast Asia to Europe and North America. In contrast to the sea routes, the Silk Road via the land route to Europe is on the one hand still under construction and on the other hand is much smaller in terms of scope. Intra-Asian trade, including sea trade,
7257-502: The Bering Strait, with Big Diomede in Russia and Little Diomede in the United States . The Aleutian Islands are an island chain extending westward from the Alaskan Peninsula toward Russia's Komandorski Islands and Kamchatka Peninsula . Most of them are always associated with North America, except for the westernmost Near Islands group, which is on Asia's continental shelf beyond the North Aleutians Basin and on rare occasions could be associated with Asia, which could then allow
7380-427: The Greenwich meridian to 180° east and west. Sydney , for example, has a longitude of about 151° east . New York City has a longitude of 74° west . For most of history, mariners struggled to determine longitude. Longitude can be calculated if the precise time of a sighting is known. Lacking that, one can use a sextant to take a lunar distance (also called the lunar observation , or "lunar" for short) that, with
7503-417: The Hittite king Tudhaliya I around 1400 BCE. Roughly contemporary Linear B documents contain the term aswia ( Mycenaean Greek : 𐀀𐀯𐀹𐀊 , romanized: a-si-wi-ja ), seemingly in reference to captives from the same area. Herodotus used the term in reference to Anatolia and the territory of the Achaemenid Empire , in contrast to Greece and Egypt. He reports that Greeks assumed that Asia
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#17328450209647626-424: The Indian Ocean respectively in the late 15th century. The Russian Empire also began to expand into northwestern Asia from the 17th century, and would eventually take control of all of Siberia and most of Central Asia by the end of the 19th century. Among non-European empires, the Ottoman Empire controlled Anatolia, most of the Middle East, North Africa and the Balkans from the mid 16th century onward, while in
7749-482: The Middle East has been affected since 1948 by the Arab–Israeli conflict and American-led interventions . East Asian nations (along with Singapore in Southeast Asia) became economically prosperous with high-growth " tiger economies "; China, having undergone capitalistic reforms under Deng Xiaoping , regained its place among the top two economies of the world by the 21st century. India has also grown significantly because of economic liberalisation that started in
7872-416: The North Pole to Russia. Later, it was found useful for submarines. Due to the success of the Global Positioning System the use of Omega declined during the 1990s, to a point where the cost of operating Omega could no longer be justified. Omega was terminated on September 30, 1997, and all stations ceased operation. LORAN is a terrestrial navigation system using low frequency radio transmitters that use
7995-400: The Ottoman Empire in the early 20th century led to the Middle East also being contested and partitioned by the British and French. With the end of World War II in 1945 and the wartime ruination of Europe and imperial Japan, many countries in Asia were able to rapidly free themselves of colonial rule. The independence of India came along with the carving out of a separate nation for
8118-504: The Philippines, Sri Lanka and Vietnam. Asia has three main financial centers: Hong Kong, Tokyo and Singapore. Call centers and business process outsourcing (BPOs) are becoming major employers in India and the Philippines due to the availability of a large pool of highly skilled, English-speaking workers. The increased use of outsourcing has assisted the rise of India and the China as financial centers. Due to its large and extremely competitive information technology industry, India has become
8241-399: The Philippines, north to parallel 39°, and hit the eastward Kuroshio Current which took its galleon across the Pacific. He arrived in Acapulco on October 8, 1565. The term stems from the 1530s, from Latin navigationem (nom. navigatio ), from navigatus , pp. of navigare "to sail, sail over, go by sea, steer a ship," from navis "ship" and the root of agere "to drive". Roughly,
8364-445: The Philippines. China has many languages and dialects in different provinces. Many of the world's major religions have their origins in Asia, including the five most practiced in the world (excluding irreligion ), which are Christianity, Islam, Hinduism, Chinese folk religion (classified as Confucianism and Taoism), and Buddhism. Asian mythology is complex and diverse. The story of the Great Flood for example, as presented to Jews in
8487-440: The Red Sea over the Suez Canal into Mediterranean (see also: Indo-Mediterranean ), there via Haifa, Istanbul and Athens to the upper Adriatic to the northern Italian hub of Trieste with its rail connections to Central and Eastern Europe or further to Barcelona and around Spain and France to the European northern ports. A far smaller part of the goods traffic runs via South Africa to Europe . A particularly significant part of
8610-454: The U.S. state of Alaska as well as the United States itself to be considered a transcontinental state. The Aleutian Islands are sometimes associated with Oceania, owing to their status as remote Pacific islands, and their proximity to the Pacific Plate. This is extremely rare however, due to their non-tropical biogeography, as well as their inhabitants , who have historically been related to Indigenous Americans . St. Lawrence Island in
8733-407: The US as the largest economy in the world for a day, after the Japanese currency reached a record high of 79 yen /US$ . Economic growth in Asia since World War II to the 1990s had been concentrated in Japan as well as the four regions of South Korea, Taiwan, Hong Kong and Singapore located in the Pacific Rim , known as the Asian tigers , which are now all considered developed economies, having among
8856-564: The area of multinational corporations , but increasingly the PRC and India are making significant inroads. Many companies from Europe, North America, South Korea and Japan have operations in Asia's developing countries to take advantage of its abundant supply of cheap labour and relatively developed infrastructure. According to Citigroup in 2011, 9 of 11 Global Growth Generators countries came from Asia driven by population and income growth. They are Bangladesh, China, India, Indonesia, Iraq, Mongolia,
8979-612: The border of southeast Asia, with the Aru Islands and Western New Guinea , to the east of the Lydekker's Line, being wholly part of Oceania, as both lie on the Australian continental plate. Culturally, the Wallacea region denoted the transition between Austronesian and Melanesian people , with varying degrees of intermixing between the two. In general, the further west and coastal a region is,
9102-492: The bridge wing for recording sight times. In practice, a wrist watch coordinated to the nearest second with the chronometer will be adequate. A stop watch, either spring wound or digital, may also be used for celestial observations. In this case, the watch is started at a known GMT by chronometer, and the elapsed time of each sight added to this to obtain GMT of the sight. All chronometers and watches should be checked regularly with
9225-421: The civilian navigator on a merchant ship or leisure craft must often take and plot their position themselves, typically with the aid of electronic position fixing. While the military navigator will have a bearing book and someone to record entries for each fix, the civilian navigator will simply pilot the bearings on the chart as they are taken and not record them at all. If the ship is equipped with an ECDIS , it
9348-489: The concept of Asia derives from the term for the eastern region from a European perspective, Asia is the remaining vast area of Eurasia minus Europe. Therefore, Asia is a region where various independent cultures coexist rather than sharing a single culture, and the boundary between Europe is somewhat arbitrary and has moved since its first conception in classical antiquity . The division of Eurasia into two continents reflects East–West cultural differences, some of which vary on
9471-537: The continent of Asia". Geographically, Asia is the major eastern constituent of the continent of Eurasia with Europe being a northwestern peninsula of the landmass. Asia, Europe and Africa make up a single continuous landmass— Afro-Eurasia —and share a common continental shelf . Almost all of Europe and a major part of Asia sit atop the Eurasian Plate , adjoined on the south by the Arabian and Indian Plate and with
9594-443: The cultural borders of its various types of constituents. From the time of Herodotus, a minority of geographers have rejected the three-continent system (Europe, Africa, Asia) on the grounds that there is no substantial physical separation between them. For example, Sir Barry Cunliffe , the emeritus professor of European archeology at Oxford, argues that Europe has been geographically and culturally merely "the western excrescence of
9717-590: The dethroning of India and China as the world's foremost economies. The British Empire first became dominant in South Asia, with most of the region being conquered by British traders in the late 18th and early 19th centuries before falling under direct British rule after a failed 1857 revolt ; the 1869 completion of the Suez Canal , which increased British access to India, went on to further European influence over Africa and Asia. Around this time, Western powers started to dominate China in what later became known as
9840-657: The easternmost part of Siberia (east of the Chersky Range ) on the North American Plate . The term "Asia" is believed to originate in the Bronze Age toponym Assuwa ( Hittite : 𒀸𒋗𒉿 , romanized: aš-šu-wa ) which originally referred only to a portion of northwestern Anatolia . The term appears in Hittite records recounting how a confederation of Assuwan states including Troy unsuccessfully rebelled against
9963-485: The end of 2011, there were 18,000 Asian people mainly in Southeast Asia, China and Japan who have at least $ 100 million in disposable assets, while North America with 17,000 people and Western Europe with 14,000 people. With growing Regional Tourism with domination of Chinese visitors, MasterCard has released Global Destination Cities Index 2013 with 10 of 20 are dominated by Asia and Pacific Region Cities and also for
10086-414: The first time a city of a country from Asia ( Bangkok ) set in the top-ranked with 15.98 million international visitors. East Asia had by far the strongest overall Human Development Index (HDI) improvement of any region in the world, nearly doubling average HDI attainment over the past 40 years, according to the report's analysis of health, education and income data. China, the second highest achiever in
10209-643: The former's death in the Philippines in 1521. The fleet of seven ships sailed from Sanlúcar de Barrameda in Southern Spain in 1519, crossed the Atlantic Ocean and after several stopovers rounded the southern tip of South America . Some ships were lost, but the remaining fleet continued across the Pacific making a number of discoveries including Guam and the Philippines. By then, only two galleons were left from
10332-493: The highest GDP per capita in Asia. Asia is the largest continent in the world by a considerable margin, and it is rich in natural resources, such as petroleum , forests , fish , water , rice , copper and silver . Manufacturing in Asia has traditionally been strongest in East and Southeast Asia, particularly in China, Taiwan , South Korea, Japan, India, the Philippines, and Singapore. Japan and South Korea continue to dominate in
10455-426: The horizon or more preferably a star, each time the sextant is used. The practice of taking celestial observations from the deck of a rolling ship, often through cloud cover and with a hazy horizon, is by far the most challenging part of celestial navigation. Inertial navigation system (INS) is a dead reckoning type of navigation system that computes its position based on motion sensors. Before actually navigating,
10578-480: The index mirror and is reflected to the silvered portion of the horizon glass, then back to the observer's eye through the telescope. The observer manipulates the index arm so the reflected image of the body in the horizon glass is just resting on the visual horizon, seen through the clear side of the horizon glass. Adjustment of the sextant consists of checking and aligning all the optical elements to eliminate "index correction". Index correction should be checked, using
10701-662: The initial latitude and longitude and the INS's physical orientation relative to the Earth (e.g., north and level) are established. After alignment, an INS receives impulses from motion detectors that measure (a) the acceleration along three axes (accelerometers), and (b) rate of rotation about three orthogonal axes (gyroscopes). These enable an INS to continually and accurately calculate its current latitude and longitude (and often velocity). Advantages over other navigation systems are that, once aligned, an INS does not require outside information. An INS
10824-631: The late 19th century), New Guinea and the Pacific islands ; Japan's domination was enabled by its rapid rise that had taken place during the Meiji era of the late 19th century, in which it applied industrial knowledge learned from the West and thus overtook the rest of Asia. One significant influence on Japan had been the United States, which had begun projecting influence across the Pacific after its early-to-mid-19th century westward expansion . The breakup of
10947-675: The latitude of a place on Earth is its angular distance north or south of the equator . Latitude is usually expressed in degrees (marked with °) ranging from 0° at the Equator to 90° at the North and South poles. The latitude of the North Pole is 90° N, and the latitude of the South Pole is 90° S. Mariners calculated latitude in the Northern Hemisphere by sighting the pole star ( Polaris ) with
11070-511: The lowlands did not have enough open grasslands to support a large equestrian force; for this and other reasons, the nomads who conquered states in China, India, and the Middle East often found themselves adapting to the local, more affluent societies. The Islamic Caliphate 's defeats of the Byzantine and Persian empires led to West Asia and southern parts of Central Asia and western parts of South Asia under its control during its conquests of
11193-448: The mainspring, and a special balance designed to compensate for temperature variations. A spring-driven chronometer is set approximately to Greenwich mean time (GMT) and is not reset until the instrument is overhauled and cleaned, usually at three-year intervals. The difference between GMT and chronometer time is carefully determined and applied as a correction to all chronometer readings. Spring-driven chronometers must be wound at about
11316-711: The majority of South Asian Muslims , which in 1971 further split into the countries Pakistan and Bangladesh ; Cold War tensions between the United States and the Soviet Union strained relations between India and Pakistan and affected Asia more generally. The end of the Cold War and the Soviet Union by 1991 saw the independence of the five modern Central Asian countries. Some Arab countries took economic advantage of massive oil deposits that were discovered in their territory, becoming globally influential, though stability in
11439-402: The majority of the human population , was the site of many of the first civilizations . Its 4.7 billion people constitute roughly 60% of the world's population. Asia shares the landmass of Eurasia with Europe , and of Afro-Eurasia with both Europe and Africa . In general terms, it is bounded on the east by the Pacific Ocean , on the south by the Indian Ocean , and on the north by
11562-463: The most devastating pandemics in human history, is thought to have originated in the arid plains of central Asia, where it then travelled along the Silk Road . European involvement in Asia became more significant from the Age of Discovery onward, with Iberian-sponsored sailors such as Christopher Columbus and Vasco da Gama paving the way for new routes from Atlantic Europe to Pacific Asia and
11685-540: The navigation of spacecraft themselves. This has historically been achieved (during the Apollo program ) via a navigational computer , an Inertial navigation system, and via celestial inputs entered by astronauts which were recorded by sextant and telescope. Space rated navigational computers, like those found on Apollo and later missions, are designed to be hardened against possible data corruption from radiation. Another possibility that has been explored for deep space navigation
11808-459: The navigator will have to rely on his skill in the manual and time-tested procedures. Celestial navigation systems are based on observation of the positions of the Sun , Moon , planets and navigational stars . Such systems are in use as well for terrestrial navigating as for interstellar navigating. By knowing which point on the rotating Earth a celestial object is above and measuring its height above
11931-516: The navigator's position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and direction . In this sense, navigation includes orienteering and pedestrian navigation. In the European medieval period, navigation was considered part of the set of seven mechanical arts , none of which were used for long voyages across open ocean. Polynesian navigation
12054-698: The northern Bering Sea belongs to Alaska and may be associated with either continent but is almost always considered part of North America, as with the Rat Islands in the Aleutian chain. At their nearest points, Alaska and Russia are separated by only 4 kilometres (2.5 miles). Geographical Asia is a cultural artifact of European conceptions of the world, beginning with the Ancient Greeks , being imposed onto other cultures, an imprecise concept causing endemic contention about what it means. Asia does not exactly correspond to
12177-405: The observer's horizon, the navigator can determine his distance from that subpoint. A nautical almanac and a marine chronometer are used to compute the subpoint on Earth a celestial body is over, and a sextant is used to measure the body's angular height above the horizon. That height can then be used to compute distance from the subpoint to create a circular line of position. A navigator shoots
12300-591: The original seven. The Victoria led by Elcano sailed across the Indian Ocean and north along the coast of Africa, to finally arrive in Spain in 1522, three years after its departure. The Trinidad sailed east from the Philippines, trying to find a maritime path back to the Americas , but was unsuccessful. The eastward route across the Pacific, also known as the tornaviaje (return trip) was only discovered forty years later, when Spanish cosmographer Andrés de Urdaneta sailed from
12423-476: The path a radar object should follow on the radar display if the ship stays on its planned course. During the transit, the navigator can check that the ship is on track by checking that the pip lies on the drawn line. Global Navigation Satellite System or GNSS is the term for satellite navigation systems that provide positioning with global coverage. A GNSS allow small electronic receivers to determine their location ( longitude , latitude , and altitude ) within
12546-465: The peripheries were mostly kept separated by mountains and deserts. The Caucasus and Himalaya mountains and the Karakum and Gobi deserts formed barriers that the steppe horsemen could cross only with difficulty. While the urban city dwellers were more advanced technologically and socially, in many cases they could do little in a military aspect to defend against the mounted hordes of the steppe. However,
12669-429: The radar scanner. When a vessel (ship or boat) is within radar range of land or fixed objects (such as special radar aids to navigation and navigation marks) the navigator can take distances and angular bearings to charted objects and use these to establish arcs of position and lines of position on a chart. A fix consisting of only radar information is called a radar fix. Types of radar fixes include "range and bearing to
12792-514: The rear section of the fuselage, whereas most US aircraft enclosed the antenna in a small teardrop-shaped fairing. In navigational applications, RDF signals are provided in the form of radio beacons , the radio version of a lighthouse . The signal is typically a simple AM broadcast of a morse code series of letters, which the RDF can tune in to see if the beacon is "on the air". Most modern detectors can also tune in any commercial radio stations, which
12915-682: The regional division of Asia. The following subdivision into regions is used, among others, by the United Nations Statistics Division (UNSD). This division of Asia into regions by the United Nations is done solely for statistical reasons and does not imply any assumption about political or other affiliations of countries and territories. Asia has extremely diverse climate features. Climates range from Arctic and subarctic in Siberia to tropical in southern India and Southeast Asia. It
13038-409: The same frequency range, called CHAYKA . LORAN use is in steep decline, with GPS being the primary replacement. However, there are attempts to enhance and re-popularize LORAN. LORAN signals are less susceptible to interference and can penetrate better into foliage and buildings than GPS signals. Radar is an effective aid to navigation because it provides ranges and bearings to objects within range of
13161-412: The same time each day. Quartz crystal marine chronometers have replaced spring-driven chronometers aboard many ships because of their greater accuracy. They are maintained on GMT directly from radio time signals. This eliminates chronometer error and watch error corrections. Should the second hand be in error by a readable amount, it can be reset electrically. The basic element for time generation
13284-400: The screen that is parallel to the ship's course, but offset to the left or right by some distance. This parallel line allows the navigator to maintain a given distance away from hazards . The line on the radar screen is set to a specific distance and angle, then the ship's position relative to the parallel line is observed. This can provide an immediate reference to the navigator as to whether
13407-495: The ship is on or off its intended course for navigation. Other techniques that are less used in general navigation have been developed for special situations. One, known as the "contour method," involves marking a transparent plastic template on the radar screen and moving it to the chart to fix a position. Another special technique, known as the Franklin Continuous Radar Plot Technique, involves drawing
13530-435: The single largest emitter of greenhouse gases in the 21st century, while India is the third-largest. As a whole, Asia currently accounts for 36% of world's primary energy consumption, which is expected to increase to 48% by 2050. By 2040, it is also expected to account for 80% of the world's coal and 26% of the world's natural gas consumption. While the United States remains the world's largest oil consumer, by 2050 it
13653-583: The stronger the Austronesian influences, and the further east and inland a region is, the stronger the Melanesian influences. The terms Southeast Asia and Oceania, devised in the 19th century, have had several vastly different geographic meanings since their inception. The chief factor in determining which islands of the Indonesian Archipelago are Asian has been the location of the colonial possessions of
13776-809: The table. The practice of navigation usually involves a combination of these different methods. By mental navigation checks, a pilot or a navigator estimates tracks, distances, and altitudes which will then help the pilot avoid gross navigation errors. Piloting (also called pilotage) involves navigating an aircraft by visual reference to landmarks, or a water vessel in restricted waters and fixing its position as precisely as possible at frequent intervals. More so than in other phases of navigation, proper preparation and attention to detail are important. Procedures vary from vessel to vessel, and between military, commercial, and private vessels. As pilotage takes place in shallow waters , it typically involves following courses to ensure sufficient under keel clearance , ensuring
13899-603: The threat of heatwaves across the entire continent. Heatwaves lead to increased mortality, and the demand for air conditioning is rapidly accelerating as the result. By 2080, around 1 billion people in the cities of South and Southeast Asia are expected to experience around a month of extreme heat every year. The impacts on water cycle are more complicated: already arid regions, primarily located in West Asia and Central Asia , will see more droughts , while areas of East , Southeast and South Asia which are already wet due to
14022-459: The time interval between radio signals received from three or more stations to determine the position of a ship or aircraft. The current version of LORAN in common use is LORAN-C, which operates in the low frequency portion of the EM spectrum from 90 to 110 kHz . Many nations are users of the system, including the United States , Japan , and several European countries. Russia uses a nearly exact system in
14145-529: The top 5 being in Asia: Hong Kong, Singapore, Tokyo and Seoul . Around 68 percent of international firms have an office in Hong Kong. In the late 1990s and early 2000s, the economy of China had an average annual growth rate of more than 8%. According to economic historian Angus Maddison , India had the world's largest economy during 1000 BCE and 1 CE. India was the largest economy in the world for most of
14268-533: The two millennia from the 1st until 19th century, contributing 25% of the world's industrial output. China was the largest and most advanced economy on earth for much of recorded history and shared the mantle with India. For several decades in the late twentieth century Japan was the largest economy in Asia and second-largest of any single nation in the world, after surpassing the Soviet Union (measured in net material product) in 1990 and Germany in 1968. (NB: A number of supernational economies are larger, such as
14391-469: The various empires there (not all European). Lewis and Wigen assert, "The narrowing of 'Southeast Asia' to its present boundaries was thus a gradual process." The Bering Strait and Bering Sea separate the landmasses of Asia and North America , as well as forming the international boundary between Russia and the United States. This national and continental boundary separates the Diomede Islands in
14514-408: The world in terms of HDI improvement since 1970, is the only country on the "Top 10 Movers" list due to income rather than health or education achievements. Its per capita income increased a stunning 21-fold over the last four decades, also lifting hundreds of millions out of income poverty. Yet it was not among the region's top performers in improving school enrollment and life expectancy. Nepal ,
14637-634: The world, which is in the "very high human development" category), followed by Singapore (9), Japan (19) and South Korea (22). Afghanistan (155) ranked lowest amongst Asian countries out of the 169 countries assessed. Asia is home to several language families and many language isolates . Most Asian countries have more than one language that is natively spoken. For instance, according to Ethnologue , more than 700 languages are spoken in Indonesia, more than 400 languages spoken in India, and more than 100 are spoken in
14760-509: Was historically defined by European academics. In Sweden, five years after Peter's death, in 1730 Philip Johan von Strahlenberg published a new atlas proposing the Ural Mountains as the border of Asia. Tatishchev announced that he had proposed the idea to von Strahlenberg. The latter had suggested the Emba River as the lower boundary. Over the next century various proposals were made until
14883-748: Was home to some of the world's earliest known civilizations, each of them developing around fertile river valleys. The civilizations in Mesopotamia , the Indus Valley and the Yellow River shared many similarities. These civilizations may well have exchanged technologies and ideas such as mathematics and the wheel . Other innovations, such as writing, seem to have been developed individually in each area. Cities, states and empires developed in these lowlands. The central steppe region had long been inhabited by horse-mounted nomads who could reach all areas of Asia from
15006-471: Was named after the wife of Prometheus , but that Lydians say it was named after Asies , son of Cotys, who passed the name on to a tribe at Sardis . In Greek mythology , "Asia" ( Ἀσία or Ἀσίη ) was the name of a " Nymph or Titan goddess of Lydia". The Iliad (attributed by the ancient Greeks to Homer ) mentions two Phrygians in the Trojan War named Asios (an adjective meaning "Asian"); and also
15129-490: Was the case with Loran C , its primary use was for ship navigation in coastal waters. Fishing vessels were major post-war users, but it was also used on aircraft, including a very early (1949) application of moving-map displays. The system was deployed in the North Sea and was used by helicopters operating to oil platforms . The OMEGA Navigation System was the first truly global radio navigation system for aircraft, operated by
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