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120-398: A landmark is a recognizable natural or artificial feature used for navigation , a feature that stands out from its near environment and is often visible from long distances. In modern day use, the term can also be applied to smaller structures or features, that have become local or national symbols . In old English the word landmearc (from land + mearc (mark)) was used to describe

240-493: A boundary marker , an "object set up to mark the boundaries of a kingdom, estate, etc.". Starting from around 1560, this understanding of "landmark" was replaced by a more general one. A landmark became a "conspicuous object in a landscape". A landmark literally meant a geographic feature used by explorers and others to find their way back or through an area. For example, the Table Mountain near Cape Town , South Africa

360-469: 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

480-543: 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 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

600-478: 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

720-582: A familiar or unfamiliar environment. Landmarks are often used in verbal route instructions ("Turn left at the big church and then right over the bridge.") Landmarks are usually classified as either natural landmarks or human-made landmarks, both are originally used to support navigation on finding directions. A variant is a seamark or daymark , a structure usually built intentionally to aid sailors navigating featureless coasts. Natural landmarks can be characteristic features, such as mountains or plateaus . Examples of natural landmarks are Mount Everest in

840-587: 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

960-407: 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 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

1080-482: A landmark character. 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 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

1200-452: A large subterranean network of shopping arcades. Kita and nearby Nakanoshima contain a prominent portion of the city's skyscrapers and are often featured in photographs of Osaka's skyline. Minami, though meaning "south", is essentially in Chūō Ward ( 中央区 , Chūō-ku ) and geographically central within the city. Well known districts here include Namba and Shinsaibashi shopping areas,

1320-402: 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,

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1440-547: A lively and important port. Daimyōs (feudal lords) received most of their income in the form of rice . Merchants in Osaka thus began to organize storehouses where they would store a daimyō ' s rice in exchange for a fee, trading it for either coin or a form of receipt; essentially a precursor to paper money . Many if not all of these rice brokers also made loans, and would actually become quite wealthy and powerful. Osaka merchants coalesced their shops around Dōjima , where

1560-502: A metropolis like Tokyo met with stiff opposition in some municipalities, particularly the highly populated Sakai . He then fell back on a project that included the suppression of the 24 wards of Osaka, thus dividing the city into 5 new special districts with a status similar to that of the 23 Special wards of Tokyo . It was introduced by former mayor Tōru Hashimoto , leader of the reform party Osaka Restoration Association which he founded. The referendum of May 17, 2015 called in Osaka for

1680-554: A new style in the construction of Shinto shrines, called Sumiyoshi-zukuri . The maritime panorama enjoyed from the shrine gardens inspired several artists, and nowadays the representations of that type of landscape are called Sumiyoshi drawings . Towards the end of the Yayoi period the Uemachi plateau-peninsula expanded further, transforming the Kawachi Lagoon into a lake (河内湖) connected to

1800-450: 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

1920-399: 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

2040-453: A peasant insurrection in response to the city's unwillingness to support the many poor and suffering families in the area. Approximately one-quarter of the city was razed before shogunal officials put down the rebellion, after which Ōshio killed himself. Osaka was opened to foreign trade by the government of the Bakufu at the same time as Hyogo Town (modern Kobe ) on January 1, 1868, just before

2160-404: A predominantly industrial center. The modern municipality was established in 1889 by government ordinance , with an initial area of 15 square kilometres (6 sq mi), overlapping today's Chuo and Nishi wards. Later, the city went through three major expansions to reach its current size of 223 square kilometres (86 sq mi). Osaka was the industrial center most clearly defined in

2280-540: A prominent bay area which serves as its main port as well as a tourist destination with attractions such as Kyocera Dome , Universal Studios Japan and the Tempozan Harbor Village . Higashiosaka is zoned as a separate city, although the east side of Osaka city proper contains numerous residential neighborhoods including Tsuruhashi KoreaTown, as well as the Osaka Castle Park , Osaka Business Park and

2400-418: 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

2520-449: A second referendum to merge Osaka's 24 wards into 4 semi-autonomous wards was narrowly voted down. There were 692,996 (50.6%) votes against and 675,829 (49.4%) votes supported it. Osaka mayor and Osaka Ishin co-leader Ichiro Matsui said he would resign when his term ends in 2023. On February 27, 2012, three Kansai cities, Kyoto , Osaka, and Kobe , jointly asked Kansai Electric Power Company to break its dependence on nuclear power. In

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2640-400: 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

2760-404: 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

2880-413: 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

3000-449: 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

3120-540: 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. Osaka Osaka ( Japanese : 大阪市 , Hepburn : Ōsaka-shi , pronounced [oːsakaɕi] ; commonly just 大阪 , Ōsaka [oːsaka] ) is a designated city in the Kansai region of Honshu in Japan , and one of

3240-436: 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

3360-425: 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

3480-502: Is abundant, with winter being the driest season, while monthly rainfall peaks in June with the "tsuyu" rainy season, which typically ends in mid to late July. From late July through the end of August, summer's heat and humidity peaks, and rainfall decreases somewhat. Osaka experiences a second rainy period in September and early October, when tropical weather systems, including typhoons, coming from

3600-455: Is an international center of research and development and is represented by several major universities, notably Osaka University , Osaka Metropolitan University , and Kansai University . Famous landmarks in the city include Osaka Castle , Osaka Aquarium Kaiyukan , Dōtonbori , Tsūtenkaku in Shinsekai , Tennōji Park , Abeno Harukas , Sumiyoshi Taisha Grand Shrine , and Shitennō-ji , one of

3720-1027: 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

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3840-441: 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

3960-531: Is located in the humid subtropical climate zone ( Köppen Cfa ), with four distinct seasons. Its winters are generally mild, with January being the coldest month having an average high of 9.7 °C (49 °F). The city rarely sees snowfall during the winter. Spring in Osaka starts off mild, but ends up being hot and humid. It also tends to be Osaka's wettest season, with the tsuyu ( 梅雨 , tsuyu , "plum rain") —the rainy season—occurring between early June and late July. The average starting and ending dates of

4080-478: 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

4200-516: Is now Osaka, making it the capital of Japan. The city now known as Osaka was at this time referred to as Naniwa, and this name and derivations of it are still in use for districts in central Osaka such as Naniwa ( 浪速 ) and Namba ( 難波 ). Although the capital was moved to Asuka (in Nara Prefecture today) in 655, Naniwa remained a vital connection, by land and sea, between Yamato (modern day Nara Prefecture ), Korea , and China. Naniwa

4320-449: 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

4440-455: 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,

4560-469: Is the current and 104th president since May 2008. The mayor of the city is directly elected by the citizens every four years as well, in accordance with the Local Autonomy Law. Tōru Hashimoto , former governor of Osaka Prefecture is the 19th mayor of Osaka since 2011. The mayor is supported by two vice mayors, currently Akira Morishita and Takashi Kashiwagi, who are appointed by him in accordance with

4680-409: Is the headquarters of Daihatsu , one of Japan's oldest automobile manufacturers. Like its European and American counterparts, Osaka displayed slums, unemployment, and poverty. In Japan it was here that municipal government first introduced a comprehensive system of poverty relief, copied in part from British models. Osaka policymakers stressed the importance of family formation and mutual assistance as

4800-549: Is the main term used to designate places that might be of interest to tourists, due to notable physical features or historical significance. Landmarks in the British English sense are often used for casual navigation , such as giving directions. This is done in American English as well. In urban studies as well as in geography , a landmark is furthermore defined as an external point of reference that helps orientation in

4920-468: The Dōtonbori canal entertainment area, Nipponbashi Den Den Town, as well as arts and fashion culture-oriented areas such as Amerikamura and Horie. The 300-meter tall Abeno Harukas was the tallest skyscraper in the country from 2014 until 2023. The business districts between Kita and Minami such as Honmachi  [ ja ] and Yodoyabashi  [ ja ] , called Semba ( 船場 ) , house

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5040-1354: The Eiffel Tower in Paris , Saint Basil's Cathedral in Moscow , the Lotte World Tower in Seoul , the Colosseum in Rome , Big Ben in London , the Tsūtenkaku in Osaka , the Forbidden City in Beijing , the Great Pyramid in Giza , Christ the Redeemer in Rio de Janeiro , Statue of Unity in Narmada , Bratislava Castle in Bratislava , Helsinki Cathedral in Helsinki ,

5160-824: The Himalayas , Table Mountain in South Africa, Mount Ararat in Turkey, Uluru in Australia, Mount Fuji in Japan and the Grand Canyon in the United States. Trees might also serve as local landmarks, such as jubilee oaks or conifers . Some landmark trees may be named, such as Queen's Oak , Hanging Oak and Centennial Tree . Bases of fallen trees, known in this context as rootstocks , are used as navigational aids on high-resolution maps and in

5280-519: The Meiji Restoration , Osaka greatly expanded in size and underwent rapid industrialization. In 1889, Osaka was officially established as a municipality. The construction boom accelerated population growth throughout the following decades, and by the 1900s, Osaka was the industrial hub in the Meiji and Taishō periods. Osaka made noted contributions to redevelopment, urban planning and zoning standards in

5400-518: The Rice Exchange was established in 1697 and where the world's first futures market would come to exist to sell rice that was not yet harvested. The popular culture of Osaka was closely related to ukiyo-e depictions of life in Edo . By 1780, Osaka had cultivated a vibrant arts culture, as typified by its famous Kabuki and Bunraku theaters. In 1837, Ōshio Heihachirō , a low-ranking samurai , led

5520-1456: The Space Needle in Seattle , the Sydney Opera House in Sydney , the Brandenburg Gate in Berlin , the Château Frontenac in Quebec (city) , Place Stanislas in Nancy , the CN Tower in Toronto , the Palace of Culture and Science in Warsaw , the Atomium in Brussels , Gateway Arch in St Louis , and the Moai in Easter Island . Church spires and mosque minarets are often very tall and visible from many miles around and thus often serve as built landmarks. Also town hall towers and belfries often have

5640-868: 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, 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

5760-537: 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

5880-409: The kanji 坂 was abhorred because it "returns to the earth," and then 阪 was used. The kanji 土 (earth) is also similar to the word 士 (knight), and 反 means against, so 坂 can be understood as "samurai rebellion," then 阪 was official name in 1868 after the Meiji Restoration . The older kanji (坂) is still in very limited use, usually only in historical contexts. As an abbreviation,

6000-400: 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

6120-471: The 10th- largest urban area in the world with more than 19 million inhabitants. Ōsaka was traditionally considered Japan's economic hub. By the Kofun period (300–538) it had developed into an important regional port, and in the 7th and 8th centuries, it served briefly as the imperial capital. Osaka continued to flourish during the Edo period (1603–1867) and became known as a center of Japanese culture. Following

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6240-451: 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, 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

6360-472: The 1960s when large-scale prefectural suburbanization began and doubled to six million by the 1990s. The factories were rebuilt and trade revived, the city were developed rapidly it became a major multicultural and financial center in the postwar period between the 1950s and the 1980s , it is known as the " Chicago and Toronto of the Orient". Osaka Prefecture was chosen as the venue for the prestigious Expo '70 ,

6480-680: The 300-meter tall Abeno Harukas opened, which is the tallest skyscraper in Japan surpassing the Yokohama Landmark Tower in Yokohama , until it was surpassed by the 330-meter tall Azabudai Hills Main Tower in Tokyo since 2022. The city's west side is open to Osaka Bay , and is otherwise completely surrounded by more than ten satellite cities, all of them in Osaka Prefecture , with one exception:

6600-526: 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 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

6720-542: The Jomon period. In addition to the remains of consumed food, there were arrow heads, stone tools, fishing hooks and crockery with remains from rice processing. It is estimated that the ruins contain 2,000-year-old debris between the Jomon and Yayoi period . The findings of the archeological sites are exhibited in an adjacent building. In the years between the end of the Jōmon period and

6840-416: 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

6960-412: 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 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

7080-400: The Osaka region in terms of calculation, shrewdness, lack of civic spirit, and the vulgarity of Osaka dialect. Edo writers aspired to samurai culture, and saw themselves as poor but generous, chaste, and public spirited. Edo writers by contrast saw "zeeroku" as obsequious apprentices, stingy, greedy, gluttonous, and lewd. To some degree, Osaka residents are still stigmatized by Tokyo observers in

7200-465: 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 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

7320-437: The advent of the Boshin War and the Meiji Restoration . The Kawaguchi foreign settlement , now the Kawaguchi subdistrict, is a legacy of the foreign presence in Osaka. Osaka residents were stereotyped in Edo literature from at least the 18th century. Jippensha Ikku in 1802 depicted Osakans as stingy almost beyond belief. In 1809, the derogatory term "Kamigata zeeroku" was used by Edo residents to characterize inhabitants of

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7440-433: The air raid took almost the entire night and destroyed 25 square miles (65 km ) of the city. The U.S. bombed the city again twice in June 1945 and again on August 14, a day before Japan's surrender . In the decades after World War II, the reconstruction plan and the industriousness of its inhabitants ensured Osaka even greater prosperity than it had before the war. Osaka's population regrew to more than three million in

7560-462: The approval of this project saw the narrow victory of no, and consequently Hashimoto announced his withdrawal from politics. A second referendum for a merger into 4 semi-autonomous wards was narrowly voted down by 692,996 (50.6%). According to the Forbes list of The World's Most Expensive Places To Live 2009 , Osaka was the second most expensive in the world after Tokyo . By 2020 it slipped to 5th rank of most expensive cities. On March 7, 2014,

7680-500: The beginning of the Yayoi period, the sediments that were deposited north of the Uemachi peninsula / plateau transformed Kawachi Bay into a lagoon. During the Yayoi period (300 BCE-250 CE), permanent habitation on the plains grew as rice farming became popular. At the beginning of the third century CE the grand shrine of Sumiyoshi-taisha was inaugurated near the harbor, commissioned by consort Empress Jingū . This Shinto shrine structure survived historical events, which inaugurated

7800-399: The best way to combat poverty. This minimized the cost of welfare programs. During World War II , Osaka came under air raids in 1945 by the United States Army Air Forces as part of the air raids on Japan . On March 13, 1945, a total of 329 Boeing B-29 Superfortress heavy bombers took part in the raid against Osaka. According to an American prisoner of war who was held in the city,

7920-446: 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

8040-746: The city bylaw. Osaka also houses several agencies of the Japanese government. Below is a list of governmental offices housed in Osaka. In July 2012, a joint multi-party bill was submitted to the Diet that would allow for implementation of the Osaka Metropolis plan as pursued by the mayor of Osaka city, the governor of Osaka and their party . If implemented, Osaka City, neighboring Sakai City and possibly other surrounding municipalities would dissolve and be reorganized as four special wards of Osaka prefecture – similar to former Tokyo City 's successor wards within Tokyo prefecture. Special wards are municipal-level administrative units that leave some otherwise municipal administrative responsibilities and revenues to

8160-447: The city of Amagasaki , belonging to Hyōgo Prefecture , in the northwest. The city occupies a larger area (about 13%) than any other city or village within Osaka Prefecture. When the city was established in 1889, it occupied roughly the area known today as the Chuo and Nishi wards, only 15.27 square kilometres (6 sq mi) that would eventually grow into today's 222.30 square kilometres (86 sq mi) via incremental expansions,

8280-421: 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

8400-423: The copula ya instead of da , and the suffix -hen instead of -nai in negative verb forms. The Osaka City Council is the city's local government formed under the Local Autonomy Law . The council has eighty-nine seats, allocated to the twenty-four wards proportional to their population and re-elected by the citizens every four years. The council elects its president and Vice President. Toshifumi Tagaya ( LDP )

8520-451: The development of capitalism in Japan. It became known as the " Manchester and Melbourne of the Orient". In 1925, it was the largest and most populous city in Japan and sixth in the world. The rapid industrialization attracted many Asian immigrants (Indians, Chinese, and Koreans), who set up a life apart for themselves. The political system was pluralistic, with a strong emphasis on promoting industrialization and modernization. Literacy

8640-639: 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 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

8760-533: The favorable geological conditions, rich in fresh water and lush vegetation, and because its position was defensible against military attack. The earliest evidence of settlements in the Osaka area are the Morinomiya ruins ( 森ノ宮遺跡 , Morinomiya iseki ) which is located in the central Chuo-ku district. Buried human skeletons and a kaizuka (a mound containing remains), were found as well as shell mounds, oysters, and other interesting archeological discoveries from

8880-514: The first world's fair ever held in an Asian country. Since then, numerous international events have been held in Osaka, including the 1995 APEC Summit . The modern municipality, which when it was established in 1889 occupied an area of just 15 km including the districts of Chūō and Nishi, following three successive expansions has reached an area of 222 km . It was one of the first cities in Japan to obtain designated city status in 1956. The plan to reorganize Osaka and its province into

9000-426: 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,

9120-456: The hub Kyōbashi Station . Osaka contains numerous urban canals and bridges, many of which serve as the namesake for their surrounding neighborhoods. The phrase "808 bridges of Naniwa" was an expression in old Japan used to indicate impressiveness and the "uncountable". Osaka numbered roughly 200 bridges by the Edo period and 1,629 bridges by 1925. As many of the city's canals were gradually filled in,

9240-480: 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

9360-662: 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

9480-567: The largest of which being a single 126.01-square-kilometre (49 sq mi) expansion in 1925. Osaka's highest point is 37.5 metres (123.0 ft) Tokyo Peil in Tsurumi-ku , and the lowest point is in Nishiyodogawa-ku at −2.2 metres (−7.2 ft) Tokyo Peil. Osaka has a latitude of 34.67 (near the 35th parallel north ), which makes it more southern than Rome (41.90), Madrid (40.41), San Francisco (37.77) and Seoul (37.53). Osaka

9600-448: 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

9720-574: The modern kanji 阪 han refers to Osaka City or Osaka Prefecture . During the Jōmon period (7,000 BCE), present-day Osaka was mostly submerged, and the Uemachi Plateau ( 上町台地 , Uemachi Daichi ) formed a 12 km long and 2.5 km wide peninsula separating Kawachi Bay from the Seto Inland Sea . It is considered one of the first places where inhabitants of Japan settled, both for

9840-640: 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 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 ,

9960-509: The mouth of the Yodo River , which had widened to the south. By the Kofun period , Osaka developed into a hub port connecting the region to the western part of Japan. The port of Naniwa-tsu was established and became the most important in Japan. Trade with other areas of the country and the Asian continent intensified. The large numbers of increasingly larger keyhole-shaped Kofun mounds found in

10080-540: 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

10200-459: 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

10320-497: The number dropped to 872, of which 760 are currently managed by Osaka City. There are currently 24 wards in Osaka: per km Population numbers have been recorded in Osaka since as early as 1873, in the early Meiji era . According to the census in 2005, there were 2,628,811 residents in Osaka, an increase of 30,037 or 1.2% from 2000. There were 1,280,325 households with approximately 2.1 persons per household. The population density

10440-405: 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

10560-409: The oldest Buddhist temples in Japan. Ōsaka means "large hill" or "large slope". It is unclear when this name gained prominence over Naniwa, but the oldest written evidence for the name dates back to 1496. By the Edo period , 大坂 ( Ōsaka ) and 大阪 ( Ōsaka ) were mixed use, and the writer Hamamatsu Utakuni  [ ja ] , in his book Setsuyo Ochiboshu published in 1808, states that

10680-503: 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 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

10800-476: 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

10920-451: The plains of Osaka are evidence of political-power concentration, leading to the formation of a state. The findings in the neighboring plains, including the mausoleum of Emperor Nintoku was discovered nearby in Sakai testify to the status of imperial city that Osaka had reached. Four of these mounds can be seen in Osaka, in which important members of the nobility are buried. They are located in

11040-414: The port of Naniwa-tsu increased in such a way that huge warehouses were built to stow material arriving and departing. The Kojiki records that during 390–430 CE, there was an imperial palace located at Osumi, in what is present day Higashiyodogawa ward , but it may have been a secondary imperial residence rather than a capital. In 645, Emperor Kōtoku built his Naniwa Nagara-Toyosaki Palace in what

11160-542: The postwar period, and the city developed rapidly as one of the major financial centers in the Keihanshin Metropolitan Area. Osaka is a major financial center of Japan, and it is recognized as one of the most multicultural and cosmopolitan cities in Japan. The city is home to the Osaka Exchange as well as the headquarters of multinational electronics corporations such as Panasonic and Sharp . Osaka

11280-412: 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 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

11400-452: The prefectural administration. In October 2018, the city of Osaka officially ended its sister city relationship with San Francisco in the United States after the latter permitted a monument memorializing "comfort women" to remain on a city-owned property, circulating in the process a 10-page, 3,800-word letter in English addressed to San Francisco mayor London Breed . On November 1, 2020,

11520-607: 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 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

11640-429: 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

11760-427: The rainy season are June 7 and July 21 respectively. Summers are very hot and humid. In August, the hottest month, the average daily high temperature reaches 33.7 °C (93 °F), while average nighttime low temperatures typically hover around 25.8 °C (78 °F). Fall in Osaka sees a cooling trend, with the early part of the season resembling summer while the latter part of fall resembles winter. Precipitation

11880-514: 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

12000-451: The regional headquarters of many large-scale banks and corporations. The Midōsuji boulevard runs through Semba and connects Kita and Minami. Further south of Minami are neighborhoods such as Shinsekai (with its Tsūtenkaku tower), Tennoji and Abeno (with Tennoji Zoo , Shitennō-ji and Abeno Harukas ), and the Kamagasaki slums, the largest slum in Japan. The city's west side is

12120-409: 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

12240-412: 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

12360-431: The same way today, especially in terms of gluttony, evidenced in the phrase, "Residents of Osaka devour their food until they collapse" ( 大阪は食倒れ , "Ōsaka wa kuidaore" ) . With the enormous changes that characterized the country after the Meiji Restoration (1868), and the relocation of the capital from Kyoto to Tokyo , Osaka entered a period of decline. From being the capital of the economy and finance, it became

12480-400: 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

12600-495: 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

12720-560: The south or southwest are possible. Osaka's sprawling cityscape has been described as "only surpassed by Tokyo as a showcase of the Japanese urban phenomenon". Central Osaka is roughly divided into downtown and uptown areas known as Kita ( キタ , "north") and Minami ( ミナミ , "south") . Kita is home to the Umeda district and its immediate surrounding neighborhoods, a major business and retail hub that plays host to Osaka Station City and

12840-516: The southern districts of the city and date back to the 5th century. A group of megalithic tombs called Mozu Tombs are located in Sakai , Osaka Prefecture. Important works of the Kofun period is the excavation that diverted the course of the Yamato River , whose floods caused extensive damage, and the construction of important roads in the direction of Sakai and Nara . Maritime traffic connected to

12960-648: 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 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

13080-650: The sport of orienteering . Because most woods have many fallen trees, generally only very large rootstocks are mapped. In the modern sense, landmarks are usually referred to as monuments or prominent distinctive buildings, used as the symbol of a certain area, city, or nation . Some examples are Tokyo Tower in Tokyo , the White House in Washington, D.C. , the Statue of Liberty and Empire State Building in New York City ,

13200-553: The surrender of the monks and subsequent razing of the temple. Toyotomi Hideyoshi constructed Osaka Castle in its place in 1583. Osaka Castle played a pivotal role in the Siege of Osaka (1614–1615). Osaka was long considered Japan's primary economic center, with a large percentage of the population belonging to the merchant class (see Four divisions of society ). Over the course of the Edo period (1603–1867), Osaka grew into one of Japan's major cities and returned to its ancient role as

13320-809: 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

13440-483: The three major cities of Japan ( Tokyo -Osaka- Nagoya ). It is the capital of and most populous city in Osaka Prefecture , and the third-most populous city in Japan, following the special wards of Tokyo and Yokohama . With a population of 2.7 million in the 2020 census, it is also the largest component of the Keihanshin Metropolitan Area , which is the second-largest metropolitan area in Japan and

13560-459: 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

13680-422: The two largest groups being Korean (60,110) and Chinese (39,551) 2021 years. Ikuno , with its Tsuruhashi district, is the home to one of the largest population of Korean residents in Japan, with 20,397 registered Zainichi Koreans . The commonly spoken dialect of this area is Osaka-ben , a typical sub-dialect of Kansai-ben . Of the many other particularities that characterize Osaka-ben, examples include using

13800-448: Was 11,836 persons per km . The Great Kantō earthquake caused a mass migration to Osaka between 1920 and 1930, and the city became Japan's largest city in 1930 with 2,453,573 people, outnumbering even Tokyo, which had a population of 2,070,913. The population peaked at 3,252,340 in 1940, and had a post-war peak of 3,156,222 in 1965, but has declined since, as the residents moved out to the suburbs. There were 144,123 registered foreigners,

13920-532: Was declared the capital again in 744 by order of Emperor Shōmu , and remained so until 745, when the Imperial Court moved back to Heijō-kyō (now Nara ). By the end of the Nara period, Naniwa's seaport roles had been gradually taken over by neighboring areas, but it remained a lively center of river, channel, and land transportation between Heian-kyō (Kyoto today) and other destinations. Sumiyoshi Taisha Grand Shrine

14040-408: Was founded by Tamomi no Sukune in 211 CE. Shitennō-ji was first built in 593 CE and the oldest Buddhist temple in Japan. In 1496, Jōdo Shinshū Buddhists established their headquarters in the heavily fortified Ishiyama Hongan-ji , located directly on the site of the old Naniwa Imperial Palace. Oda Nobunaga began a decade-long siege campaign on the temple in 1570 which ultimately resulted in

14160-478: Was high and the educational system expanded rapidly, producing a middle class with a taste for literature and a willingness to support the arts. In 1927, General Motors operated a factory called Osaka Assembly until 1941, manufacturing Chevrolet , Cadillac , Pontiac , Oldsmobile , and Buick vehicles, operated and staffed by Japanese workers and managers. In the nearby city of Ikeda in Osaka Prefecture

14280-490: 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

14400-515: Was used as a landmark to help sailors to navigate around the southern tip of Africa during the Age of Exploration . Artificial structures are also sometimes built to assist sailors in navigation. The Lighthouse of Alexandria and the Colossus of Rhodes are ancient structures built to lead ships to the port. In modern usage, a landmark includes anything that is easily recognizable, such as a monument , building, or other structure. In American English it

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