Geographic coordinate system
A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position. A common choice of coordinates is latitude and elevation. To specify a location on a plane requires a map projection; the invention of a geographic coordinate system is credited to Eratosthenes of Cyrene, who composed his now-lost Geography at the Library of Alexandria in the 3rd century BC. A century Hipparchus of Nicaea improved on this system by determining latitude from stellar measurements rather than solar altitude and determining longitude by timings of lunar eclipses, rather than dead reckoning. In the 1st or 2nd century, Marinus of Tyre compiled an extensive gazetteer and mathematically-plotted world map using coordinates measured east from a prime meridian at the westernmost known land, designated the Fortunate Isles, off the coast of western Africa around the Canary or Cape Verde Islands, measured north or south of the island of Rhodes off Asia Minor.
Ptolemy credited him with the full adoption of longitude and latitude, rather than measuring latitude in terms of the length of the midsummer day. Ptolemy's 2nd-century Geography used the same prime meridian but measured latitude from the Equator instead. After their work was translated into Arabic in the 9th century, Al-Khwārizmī's Book of the Description of the Earth corrected Marinus' and Ptolemy's errors regarding the length of the Mediterranean Sea, causing medieval Arabic cartography to use a prime meridian around 10° east of Ptolemy's line. Mathematical cartography resumed in Europe following Maximus Planudes' recovery of Ptolemy's text a little before 1300. In 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, England as the zero-reference line; the Dominican Republic voted against the motion, while Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911.
In order to be unambiguous about the direction of "vertical" and the "horizontal" surface above which they are measuring, map-makers choose a reference ellipsoid with a given origin and orientation that best fits their need for the area they are mapping. They choose the most appropriate mapping of the spherical coordinate system onto that ellipsoid, called a terrestrial reference system or geodetic datum. Datums may be global, meaning that they represent the whole Earth, or they may be local, meaning that they represent an ellipsoid best-fit to only a portion of the Earth. Points on the Earth's surface move relative to each other due to continental plate motion and diurnal Earth tidal movement caused by the Moon and the Sun; this daily movement can be as much as a metre. Continental movement can be up to 10 m in a century. A weather system high-pressure area can cause a sinking of 5 mm. Scandinavia is rising by 1 cm a year as a result of the melting of the ice sheets of the last ice age, but neighbouring Scotland is rising by only 0.2 cm.
These changes are insignificant if a local datum is used, but are statistically significant if a global datum is used. Examples of global datums include World Geodetic System, the default datum used for the Global Positioning System, the International Terrestrial Reference Frame, used for estimating continental drift and crustal deformation; the distance to Earth's center can be used both for deep positions and for positions in space. Local datums chosen by a national cartographical organisation include the North American Datum, the European ED50, the British OSGB36. Given a location, the datum provides the latitude ϕ and longitude λ. In the United Kingdom there are three common latitude and height systems in use. WGS 84 differs at Greenwich from the one used on published maps OSGB36 by 112 m; the military system ED50, used by NATO, differs from about 120 m to 180 m. The latitude and longitude on a map made against a local datum may not be the same as one obtained from a GPS receiver. Coordinates from the mapping system can sometimes be changed into another datum using a simple translation.
For example, to convert from ETRF89 to the Irish Grid add 49 metres to the east, subtract 23.4 metres from the north. More one datum is changed into any other datum using a process called Helmert transformations; this involves converting the spherical coordinates into Cartesian coordinates and applying a seven parameter transformation, converting back. In popular GIS software, data projected in latitude/longitude is represented as a Geographic Coordinate System. For example, data in latitude/longitude if the datum is the North American Datum of 1983 is denoted by'GCS North American 1983'; the "latitude" of a point on Earth's surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the Equator and to each other; the North Pole is 90° N. The 0° parallel of latitude is designated the Equator, the fun
A hoard or "wealth deposit" is an archaeological term for a collection of valuable objects or artifacts, sometimes purposely buried in the ground, in which case it is sometimes known as a cache. This would be with the intention of recovery by the hoarder. Hoards provide a useful method of providing dates for artifacts through association as they can be assumed to be contemporary, therefore used in creating chronologies. Hoards can be considered an indicator of the relative degree of unrest in ancient societies, thus conditions in 5th and 6th century Britain spurred the burial of hoards, of which the most famous are the Hoxne Hoard, Suffolk. Prudence Harper of the Metropolitan Museum of Art voiced some practical reservations about hoards at the time of the Soviet exhibition of Scythian gold in New York City in 1975. Writing of the so-called "Maikop treasure", Harper warned: By the time "hoards" or "treasures" reach museums from the antiquities market, it happens that miscellaneous objects varying in date and style have become attached to the original group.
Such "dealer's hoards" can be misleading, but better understanding of archaeology amongst collectors and the general public is making them less common and more identified. Hoards may be of precious metals, tools or less pottery or glass vessels. There are various classifications depending on the nature of the hoard. A founder's hoard contains broken or unfit metal objects, casting waste, complete objects, in a finished state; these were buried with the intention to be recovered at a time. A merchant's hoard is a collection of various functional items which, it is conjectured, were buried by a traveling merchant for safety, with the intention of retrieval. A personal hoard is a collection of personal objects buried for safety in times of unrest. A hoard of loot is a buried collection of spoils from raiding and is more in keeping with the popular idea of "buried treasure". Votive hoards are different from the above in that they are taken to represent permanent abandonment, in the form of purposeful deposition of items, either all at once or over time for ritual purposes, without intent to recover them.
Furthermore, votive hoards need not be "manufactured" goods, but can include organic amulets and animal remains. Votive hoards are distinguished from more functional deposits by the nature of the goods themselves, the places buried, the treatment of the deposit. Valuables dedicated to the use of a deity were not always permanently abandoned. Valuable objects given to a temple or church become the property of that institution, may be used to its benefit. Bactrian Gold Chausa hoard Kfar Monash Hoard Priam's Treasure Wonoboyo hoard Ziwiye hoard Ardagh Hoard Broighter Hoard Derrynaflan Hoard Dowris Hoard Mooghaun North Hoard Castine Hoard Oat Bin Hoard Saddle Ridge Hoard Megiddo Treasure, a small hoard found at Tel Megiddo List of hoards in Britain List of hoards in Ireland List of missing treasure Hacksilver Treasure Treasure trove
Silver is a chemical element with symbol Ag and atomic number 47. A soft, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, reflectivity of any metal; the metal is found in the Earth's crust in the pure, free elemental form, as an alloy with gold and other metals, in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold and zinc refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold: while it is more abundant than gold, it is much less abundant as a native metal, its purity is measured on a per-mille basis. As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Other than in currency and as an investment medium, silver is used in solar panels, water filtration, ornaments, high-value tableware and utensils, in electrical contacts and conductors, in specialized mirrors, window coatings, in catalysis of chemical reactions, as a colorant in stained glass and in specialised confectionery.
Its compounds are used in X-ray film. Dilute solutions of silver nitrate and other silver compounds are used as disinfectants and microbiocides, added to bandages and wound-dressings and other medical instruments. Silver is similar in its physical and chemical properties to its two vertical neighbours in group 11 of the periodic table and gold, its 47 electrons are arranged in the configuration 4d105s1 to copper and gold. This distinctive electron configuration, with a single electron in the highest occupied s subshell over a filled d subshell, accounts for many of the singular properties of metallic silver. Silver is an soft and malleable transition metal, though it is less malleable than gold. Silver crystallizes in a face-centered cubic lattice with bulk coordination number 12, where only the single 5s electron is delocalized to copper and gold. Unlike metals with incomplete d-shells, metallic bonds in silver are lacking a covalent character and are weak; this observation explains the low high ductility of single crystals of silver.
Silver has a brilliant white metallic luster that can take a high polish, and, so characteristic that the name of the metal itself has become a colour name. Unlike copper and gold, the energy required to excite an electron from the filled d band to the s-p conduction band in silver is large enough that it no longer corresponds to absorption in the visible region of the spectrum, but rather in the ultraviolet. Protected silver has greater optical reflectivity than aluminium at all wavelengths longer than ~450 nm. At wavelengths shorter than 450 nm, silver's reflectivity is inferior to that of aluminium and drops to zero near 310 nm. High electrical and thermal conductivity is common to the elements in group 11, because their single s electron is free and does not interact with the filled d subshell, as such interactions lower electron mobility; the electrical conductivity of silver is the greatest of all metals, greater than copper, but it is not used for this property because of the higher cost.
An exception is in radio-frequency engineering at VHF and higher frequencies where silver plating improves electrical conductivity because those currents tend to flow on the surface of conductors rather than through the interior. During World War II in the US, 13540 tons of silver were used in electromagnets for enriching uranium because of the wartime shortage of copper. Pure silver has the highest thermal conductivity of any metal, although the conductivity of carbon and superfluid helium-4 are higher. Silver has the lowest contact resistance of any metal. Silver forms alloys with copper and gold, as well as zinc. Zinc-silver alloys with low zinc concentration may be considered as face-centred cubic solid solutions of zinc in silver, as the structure of the silver is unchanged while the electron concentration rises as more zinc is added. Increasing the electron concentration further leads to body-centred cubic, complex cubic, hexagonal close-packed phases. Occurring silver is composed of two stable isotopes, 107Ag and 109Ag, with 107Ag being more abundant.
This equal abundance is rare in the periodic table. The atomic weight is 107.8682 u. Both isotopes of silver are produced in stars via the s-process, as well as in supernovas via the r-process. Twenty-eight radioisotopes have been characterized, the most stable being 105Ag with a half-life of 41.29 days, 111Ag with a half-life of 7.45 days, 112Ag with a half-life of 3.13 hours. Silver has numerous nuclear isomers, the most stable being 108mAg, 110mAg and 106mAg. All of the remaining radioactive isotopes have half-lives of less than an hour, the majority of these have half-lives of less than three minutes. Isotopes of silver range in relative atomic mass from 92.950 u
Fife is a council area and historic county of Scotland. It is situated between the Firth of Tay and the Firth of Forth, with inland boundaries to Perth and Kinross and Clackmannanshire. By custom it is held to have been one of the major Pictish kingdoms, known as Fib, is still known as the Kingdom of Fife within Scotland. Fife is one of the six local authorities part of the South East Scotland city region, it is a lieutenancy area, was a county of Scotland until 1975. It was occasionally known by the anglicisation Fifeshire in old documents and maps compiled by English cartographers and authors. A person from Fife is known as a Fifer. Fife was a local government region divided into three districts: Dunfermline and North-East Fife. Since 1996 the functions of the district councils have been exercised by the unitary Fife Council. Fife is Scotland's third largest local authority area by population, it has a resident population of just under 367,000, over a third of whom live in the three principal towns of Dunfermline and Glenrothes.
The historic town of St Andrews is located on the northeast coast of Fife. It is well known for the University of St Andrews, one of the most ancient universities in the world and is renowned as the home of golf. Fife, bounded to the north by the Firth of Tay and to the south by the Firth of Forth, is a natural peninsula whose political boundaries have changed little over the ages; the Pictish king list and De Situ Albanie documents of the Poppleton manuscript mention the division of the Pictish realm into seven sub-kingdoms or provinces, one being Fife, though this is now regarded as a medieval invention. The earliest known reference to the common epithet The Kingdom of Fife dates from only 1678, in a proposition that the term derives from the quasi-regal privileges of the Earl of Fife; the notion of a kingdom may derive from a misinterpretation of an extract from Wyntoun. The name is recorded as Fib in A. D. 1150 and Fif in 1165. It was associated with Fothriff; the hill-fort of Clatchard Craig, near Newburgh, was occupied as an important Pictish stronghold between the sixth and eighth centuries AD.
Fife was an important royal and political centre from the reign of King Malcolm III onwards, as the leaders of Scotland moved southwards away from their ancient strongholds around Scone. Malcolm had his principal home in Dunfermline and his wife Margaret was the main benefactor of Dunfermline Abbey; the Abbey replaced Iona as the final resting place of Scotland's royal elite, with Robert I amongst those to be buried there. The Earl of Fife was until the 15th century considered the principal peer of the Scottish realm, was reserved the right of crowning the nation's monarchs, reflecting the prestige of the area. A new royal palace was constructed at Falkland the stronghold of Clan MacDuff, was used by successive monarchs of the House of Stuart, who favoured Fife for its rich hunting grounds. King James VI of Scotland described Fife as a "beggar's mantle fringed wi gowd", the golden fringe being the coast and its chain of little ports with their thriving fishing fleets and rich trading links with the Low Countries.
Wool, linen and salt were all traded. Salt pans heated by local coal were a feature of the Fife coast in the past; the distinctive red clay pan tiles seen on many old buildings in Fife arrived as ballast on trading boats and replaced the thatched roofs. In 1598, King James VI employed a group of 12 men from Fife, who became known as the Fife adventurers, to colonise the Isle of Lewis in an attempt to begin the "civilisation" and de-gaelicisation of the region; this endeavour lasted until 1609 when the colonists, having been opposed by the native population, were bought out by Kenneth Mackenzie, the clan chief of the Mackenzies. Fife became a centre of heavy industry in the 19th century. Coal had been mined in the area since at least the 12th century, but the number of pits increased ten-fold as demand for coal grew in the Victorian period. Rural villages such as Cowdenbeath swelled into towns as thousands moved to Fife to find work in its mines; the opening of the Forth and Tay rail bridges linked Fife with Dundee and Edinburgh and allowed the rapid transport of goods.
Modern ports were constructed at Methil and Rosyth. Kirkcaldy became the world centre for the production of linoleum. Postwar Fife saw the development of Glenrothes. To be based around a coal mine, the town attracted a high number of modern Silicon Glen companies to the region. Fife Council and Fife Constabulary centre their operations in Glenrothes. There are numerous notable historical buildings in Fife, some of which are managed by the National Trust for Scotland or Historic Scotland, they include Dunfermline Abbey, the palace in Culross, Ravenscraig Castle in Kirkcaldy, Dysart Harbour area, Balgonie Castle near Coaltown of Balgonie, Falkland Palace, Kellie Castle near Pittenweem, Hill of Tarvit, St. Andrews Castle, St. Andrews Cathedral and St. Rule's Tower. Fife is represented by five constituency members of the Scottish Parliament and four members of the United Kingdom parliament who are sent to Holyrood and the British Parliament respectively. Following the 2015 General Election, all four of the MPs constituencies were held by the Scottish National Party.
In the 2017 General Election Kirkcaldy and Cowdenbeath was regained by Labour. At the same election, the seat of North East Fife became the closest seat in the country with the SNP holding a majority of 2 over the Liberal Democrats Three of
The Bronze Age is a historical period characterized by the use of bronze, in some areas proto-writing, other early features of urban civilization. The Bronze Age is the second principal period of the three-age Stone-Bronze-Iron system, as proposed in modern times by Christian Jürgensen Thomsen, for classifying and studying ancient societies. An ancient civilization is defined to be in the Bronze Age either by producing bronze by smelting its own copper and alloying with tin, arsenic, or other metals, or by trading for bronze from production areas elsewhere. Bronze itself is harder and more durable than other metals available at the time, allowing Bronze Age civilizations to gain a technological advantage. Copper-tin ores are rare, as reflected in the fact that there were no tin bronzes in Western Asia before trading in bronze began in the third millennium BC. Worldwide, the Bronze Age followed the Neolithic period, with the Chalcolithic serving as a transition. Although the Iron Age followed the Bronze Age, in some areas, the Iron Age intruded directly on the Neolithic.
Bronze Age cultures differed in their development of the first writing. According to archaeological evidence, cultures in Mesopotamia and Egypt developed the earliest viable writing systems; the overall period is characterized by widespread use of bronze, though the place and time of the introduction and development of bronze technology were not universally synchronous. Human-made tin bronze technology requires set production techniques. Tin must be mined and smelted separately added to molten copper to make bronze alloy; the Bronze Age was a time of developing trade networks. A 2013 report suggests that the earliest tin-alloy bronze dates to the mid-5th millennium BC in a Vinča culture site in Pločnik, although this culture is not conventionally considered part of the Bronze Age; the dating of the foil has been disputed. Western Asia and the Near East was the first region to enter the Bronze Age, which began with the rise of the Mesopotamian civilization of Sumer in the mid 4th millennium BC.
Cultures in the ancient Near East practiced intensive year-round agriculture, developed a writing system, invented the potter's wheel, created a centralized government, written law codes and nation states and empires, embarked on advanced architectural projects, introduced social stratification and civil administration and practiced organized warfare and religion. Societies in the region laid the foundations for astronomy and astrology. Dates are approximate, consult particular article for details The Ancient Near East Bronze Age can be divided as following: The Hittite Empire was established in Hattusa in northern Anatolia from the 18th century BC. In the 14th century BC, the Hittite Kingdom was at its height, encompassing central Anatolia, southwestern Syria as far as Ugarit, upper Mesopotamia. After 1180 BC, amid general turmoil in the Levant conjectured to have been associated with the sudden arrival of the Sea Peoples, the kingdom disintegrated into several independent "Neo-Hittite" city-states, some of which survived until as late as the 8th century BC.
Arzawa in Western Anatolia during the second half of the second millennium BC extended along southern Anatolia in a belt that reaches from near the Turkish Lakes Region to the Aegean coast. Arzawa was the western neighbor – sometimes a rival and sometimes a vassal – of the Middle and New Hittite Kingdoms; the Assuwa league was a confederation of states in western Anatolia, defeated by the Hittites under an earlier Tudhaliya I, around 1400 BC. Arzawa has been associated with the much more obscure Assuwa located to its north, it bordered it, may be an alternative term for it. In Ancient Egypt the Bronze Age begins in the Protodynastic period, c. 3150 BC. The archaic early Bronze Age of Egypt, known as the Early Dynastic Period of Egypt follows the unification of Lower and Upper Egypt, c. 3100 BC. It is taken to include the First and Second Dynasties, lasting from the Protodynastic Period of Egypt until about 2686 BC, or the beginning of the Old Kingdom. With the First Dynasty, the capital moved from Abydos to Memphis with a unified Egypt ruled by an Egyptian god-king.
Abydos remained the major holy land in the south. The hallmarks of ancient Egyptian civilization, such as art and many aspects of religion, took shape during the Early Dynastic period. Memphis in the Early Bronze Age was the largest city of the time; the Old Kingdom of the regional Bronze Age is the name given to the period in the 3rd millennium BC when Egypt attained its first continuous peak of civilization in complexity and achievement – the first of three "Kingdom" periods, which mark the high points of civilization in the lower Nile Valley. The First Intermediate Period of Egypt described as a "dark period" in ancient Egyptian history, spanned about 100 years after the end of the Old Kingdom from about 2181 to 2055 BC. Little monumental evidence survives from this period from the early part of it; the First Intermediate Period was a dynamic time when the rule of Egypt was divided between two competing power bases: Heracleopolis in Lower Egypt and Thebes in Upper Egypt. These two kingdoms would come into conflict, with the Theban kings conquering the north, resulting in the reunification of Egypt under a single ruler during the second part of the 11th Dynasty.
The Middle Kingdom of Egypt laste
Scotland is a country, part of the United Kingdom. Sharing a border with England to the southeast, Scotland is otherwise surrounded by the Atlantic Ocean to the north and west, by the North Sea to the northeast and by the Irish Sea to the south. In addition to the mainland, situated on the northern third of the island of Great Britain, Scotland has over 790 islands, including the Northern Isles and the Hebrides; the Kingdom of Scotland emerged as an independent sovereign state in the Early Middle Ages and continued to exist until 1707. By inheritance in 1603, James VI, King of Scots, became King of England and King of Ireland, thus forming a personal union of the three kingdoms. Scotland subsequently entered into a political union with the Kingdom of England on 1 May 1707 to create the new Kingdom of Great Britain; the union created a new Parliament of Great Britain, which succeeded both the Parliament of Scotland and the Parliament of England. In 1801, the Kingdom of Great Britain and Kingdom of Ireland enacted a political union to create a United Kingdom.
The majority of Ireland subsequently seceded from the UK in 1922. Within Scotland, the monarchy of the United Kingdom has continued to use a variety of styles and other royal symbols of statehood specific to the pre-union Kingdom of Scotland; the legal system within Scotland has remained separate from those of England and Wales and Northern Ireland. The continued existence of legal, educational and other institutions distinct from those in the remainder of the UK have all contributed to the continuation of Scottish culture and national identity since the 1707 union with England; the Scottish Parliament, a unicameral legislature comprising 129 members, was established in 1999 and has authority over those areas of domestic policy which have been devolved by the United Kingdom Parliament. The head of the Scottish Government, the executive of the devolved legislature, is the First Minister of Scotland. Scotland is represented in the UK House of Commons by 59 MPs and in the European Parliament by 6 MEPs.
Scotland is a member of the British–Irish Council, sends five members of the Scottish Parliament to the British–Irish Parliamentary Assembly. Scotland is divided into councils. Glasgow City is the largest subdivision in Scotland in terms of population, with Highland being the largest in terms of area. "Scotland" comes from the Latin name for the Gaels. From the ninth century, the meaning of Scotia shifted to designate Gaelic Scotland and by the eleventh century the name was being used to refer to the core territory of the Kingdom of Alba in what is now east-central Scotland; the use of the words Scots and Scotland to encompass most of what is now Scotland became common in the Late Middle Ages, as the Kingdom of Alba expanded and came to encompass various peoples of diverse origins. Repeated glaciations, which covered the entire land mass of modern Scotland, destroyed any traces of human habitation that may have existed before the Mesolithic period, it is believed the first post-glacial groups of hunter-gatherers arrived in Scotland around 12,800 years ago, as the ice sheet retreated after the last glaciation.
At the time, Scotland was covered in forests, had more bog-land, the main form of transport was by water. These settlers began building the first known permanent houses on Scottish soil around 9,500 years ago, the first villages around 6,000 years ago; the well-preserved village of Skara Brae on the mainland of Orkney dates from this period. Neolithic habitation and ritual sites are common and well preserved in the Northern Isles and Western Isles, where a lack of trees led to most structures being built of local stone. Evidence of sophisticated pre-Christian belief systems is demonstrated by sites such as the Callanish Stones on Lewis and the Maes Howe on Orkney, which were built in the third millennium BCE; the first written reference to Scotland was in 320 BC by Greek sailor Pytheas, who called the northern tip of Britain "Orcas", the source of the name of the Orkney islands. During the first millennium BCE, the society changed to a chiefdom model, as consolidation of settlement led to the concentration of wealth and underground stores of surplus food.
The first Roman incursion into Scotland occurred in 79 AD. After the Roman victory, Roman forts were set along the Gask Ridge close to the Highland line, but by three years after the battle, the Roman armies had withdrawn to the Southern Uplands; the Romans erected Hadrian's Wall in northern England and the Limes Britannicus became the northern border of the Roman Empire. The Roman influence on the southern part of the country was considerable, they introduced Christianity to Scotland. Beginning in the sixth century, the area, now Scotland was divided into three areas: Pictland, a patchwork of small lordships in central Scotland; these societies were based on the family unit and had sharp divisions in wealth, although the vast majority were poor and worked full-time in subsistence agriculture. The Picts kept slaves through the ninth century. Gaelic influence over Pictland and Northumbria was facilitated by the large number of Gaelic-speaking clerics working as missionaries. Operating in the sixth ce