1.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography 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. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys 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, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths 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, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
2.
Aegean Sea
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The Aegean Sea is an elongated embayment of the Mediterranean Sea located between the Greek and Anatolian peninsulas, i. e. between the mainlands of Greece and Turkey. In the north, it is connected to the Marmara Sea and Black Sea by the Dardanelles, the Aegean Islands are within the sea and some bound it on its southern periphery, including Crete and Rhodes. The sea was known as Archipelago, but in English this words meaning has changed to refer to the Aegean Islands and, generally. In ancient times, there were various explanations for the name Aegean, a possible etymology is a derivation from the Greek word αἶγες – aiges = waves, hence wavy sea, cf. also αἰγιαλός, hence meaning sea-shore. The Venetians, who ruled many Greek islands in the High and Late Middle Ages, popularized the name Archipelago, in some South Slavic languages the Aegean is often called White Sea. The Aegean Sea covers about 214,000 square kilometres in area, the seas maximum depth is 3,543 metres, east of Crete. The Aegean Islands are found within its waters, with the following islands delimiting the sea on the south, Kythera, Antikythera, Crete, Kasos, Karpathos, many of the Aegean Islands, or chains of islands, are actually extensions of the mountains on the mainland. One chain extends across the sea to Chios, another extends across Euboea to Samos, the International Hydrographic Organization defines the limits of the Aegean Sea as follows, On the South. In the Dardanelles. A line joining Kum Kale and Cape Helles, the dense Mediterranean water sinks below the Black Sea inflow to a depth of 23–30 metres, then flows through the Dardanelles Strait and into the Sea of Marmara at velocities of 5–15 cm/s. The Black Sea outflow moves westward along the northern Aegean Sea, Aegean Sea Intermediate Water – Aegean Sea Intermediate Water extends from 40–50 m to 200–300 metres with temperatures ranging from 11–18 °C. Aegean Sea Bottom Water – occurring at depths below 500–1000 m with a uniform temperature. The current coastline dates back to about 4000 BC, before that time, at the peak of the last ice age sea levels everywhere were 130 metres lower, and there were large well-watered coastal plains instead of much of the northern Aegean. When they were first occupied, the islands including Milos with its important obsidian production were probably still connected to the mainland. The present coastal arrangement appeared c.7000 BC, with post-ice age sea levels continuing to rise for another 3,000 years after that, the subsequent Bronze Age civilizations of Greece and the Aegean Sea have given rise to the general term Aegean civilization. In ancient times, the sea was the birthplace of two ancient civilizations – the Minoans of Crete and the Mycenean Civilization of the Peloponnese, later arose the city-states of Athens and Sparta among many others that constituted the Athenian Empire and Hellenic Civilization. Plato described the Greeks living round the Aegean like frogs around a pond, the Aegean Sea was later invaded by the Persians and the Romans, and inhabited by the Byzantine Empire, the Bulgarians, the Venetians, the Genoese, the Seljuq Turks, and the Ottoman Empire. The Aegean was the site of the democracies, and its seaways were the means of contact among several diverse civilizations of the Eastern Mediterranean. Many of the islands in the Aegean have safe harbours and bays, in ancient times, navigation through the sea was easier than travelling across the rough terrain of the Greek mainland
3.
Crete
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Crete is the largest and most populous of the Greek islands, 88th-largest island in the world and the fifth-largest island in the Mediterranean Sea, after Sicily, Sardinia, Cyprus, and Corsica. Crete and a number of surrounding islands and islets constitute the region of Crete, the capital and the largest city is Heraklion. As of 2011, the region had a population of 623,065, Crete forms a significant part of the economy and cultural heritage of Greece, while retaining its own local cultural traits. It was once the centre of the Minoan civilization, which is regarded as the earliest recorded civilization in Europe. The island is first referred to as Kaptara in texts from the Syrian city of Mari dating from the 18th century BC, repeated later in Neo-Assyrian records and it was also known in ancient Egyptian as Keftiu, strongly suggesting a similar Minoan name for the island. The current name of Crete is thought to be first attested in Mycenaean Greek texts written in Linear B, through the words
4.
Shipwreck
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A shipwreck is the remains of a ship that has wrecked, which are found either beached on land or sunken to the bottom of a body of water. Shipwrecking may be deliberate or accidental, UNESCO estimates that worldwide over 3 million shipwrecks, some thousands of years old, lie on seabeds. Military wrecks, caused by a skirmish at sea, are studied to find details about the historic event, they reveal much about the battle that occurred. Discoveries of treasure ships, often from the period of European colonisation, some contemporary wrecks, such as the oil tankers Prestige or Erika, are of interest primarily because of their potential harm to the environment. Other contemporary wrecks are scuttled in order to spur growth, such as Adolphus Busch. Well known shipwrecks include the catastrophic Titanic, Britannic, Lusitania, Estonia, Empress of Ireland, Andrea Doria, there are also thousands of wrecks that were not lost at sea but have been abandoned or sunk. These abandoned, or derelict ships are smaller craft, such as fishing vessels. They may pose a hazard to navigation and may be removed by port authorities, poor design, improperly stowed cargo, navigation and other human errors leading to collisions, bad weather, fire, and other causes can lead to accidental sinkings. Intentional reasons for sinking a ship include forming a reef, due to warfare, piracy, mutiny or sabotage, as part of target practice. A ship can be used as breakwater structure. The stratification not only creates another challenge for marine archaeology but also a challenge to its primary state, stratification includes several different types of sand and/or silt, as well as tumulus and encrustations. These sediments are tightly linked to the type of currents, depth, and the type of water, besides this geological phenomenon, wrecks also face the damage of marine creatures that create a home out of them, primarily being octopuses and crustaceans. All the above offers great challenges to the marine archaeologist when attempting to bind the pieces of a certain shipwreck together, despite these challenges, if the information retrieved does not appear to be sufficient, or a poor preservation is achieved, authors like J. A. Parker claim that it is the value of the shipwreck that counts. Often the only parts of ships that remain after a century are those that were buried in silt or sand soon after the sinking. An example of this is the Mary Rose, steel and iron, depending on their thickness, may retain the ships structure for decades. As corrosion takes place, sometimes helped by tides and weather, thick ferrous objects such as cannons, steam boilers or the pressure vessel of a submarine often survive well underwater in spite of corrosion. Propellers, condensers, hinges and port holes were made from non-ferrous metals such as brass and phosphor bronze
5.
Sponge diving
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Sponge diving is the oldest known form of the original art of underwater diving. Its purpose is to retrieve natural sponges for human use, most sponges are too rough for general use due to their structural spicules composed of calcium carbonate or silica. But two genera, Hippospongia and Spongia, have soft, entirely fibrous skeletons and these two genera are most commonly used by humans. It is unknown when exactly the sponge became an article of use, in Ancient Greek writings, Homer and Plato mentioned the sponge as an object used for bathing. Through trading, Europeans used soft sponges for many purposes including padding for helmets, portable drinking utensils, until the invention of synthetic sponges, they were used as cleaning tools, applicators for paints and ceramic glazes, and discreet contraceptives. However, by the century, over-fishing had brought both the animals and the industry close to extinction. Many objects with sponge-like textures are now made of substances not derived from poriferans, synthetic sponges include, personal and household cleaning tools, breast implants, and contraceptive sponges. In Kalymnos, only 18% of the volcanic land could be cultivated, so the main occupations were trading, boat building and sponge fishing. Diving for sponges brought social and economical development to the island, when sponge diving, the crew went out into the Mediterranean Sea in a small boat, and used a cylindrical object with a glass bottom to search the sea floor for sponges. When one was found, a diver went overboard to get it, free diving, he was usually naked and carried a 15 kilograms skandalopetra, a rounded stone tied on a rope to the boat, to take him down to the bottom quickly. The diver then cut the sponge loose from the bottom and put a net around it. Depth and bottom time depended on the lung capacity. They often went down about 30 metres for up to 5 minutes, natural Sea Sponges and sponge diving history. Natural Sea Sponges and sponge diving history, – Blog, but has interesting images and some useful information
6.
Greece
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Greece, officially the Hellenic Republic, historically also known as Hellas, is a country in southeastern Europe, with a population of approximately 11 million as of 2015. Athens is the capital and largest city, followed by Thessaloniki. Greece is strategically located at the crossroads of Europe, Asia, situated on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, the Republic of Macedonia and Bulgaria to the north, and Turkey to the northeast. Greece consists of nine regions, Macedonia, Central Greece, the Peloponnese, Thessaly, Epirus, the Aegean Islands, Thrace, Crete. The Aegean Sea lies to the east of the mainland, the Ionian Sea to the west, the Cretan Sea and the Mediterranean Sea to the south. Greece has the longest coastline on the Mediterranean Basin and the 11th longest coastline in the world at 13,676 km in length, featuring a vast number of islands, eighty percent of Greece is mountainous, with Mount Olympus being the highest peak at 2,918 metres. From the eighth century BC, the Greeks were organised into various independent city-states, known as polis, which spanned the entire Mediterranean region and the Black Sea. Greece was annexed by Rome in the second century BC, becoming a part of the Roman Empire and its successor. The Greek Orthodox Church also shaped modern Greek identity and transmitted Greek traditions to the wider Orthodox World, falling under Ottoman dominion in the mid-15th century, the modern nation state of Greece emerged in 1830 following a war of independence. Greeces rich historical legacy is reflected by its 18 UNESCO World Heritage Sites, among the most in Europe, Greece is a democratic and developed country with an advanced high-income economy, a high quality of life, and a very high standard of living. A founding member of the United Nations, Greece was the member to join the European Communities and has been part of the Eurozone since 2001. Greeces unique cultural heritage, large industry, prominent shipping sector. It is the largest economy in the Balkans, where it is an important regional investor, the names for the nation of Greece and the Greek people differ from the names used in other languages, locations and cultures. The earliest evidence of the presence of human ancestors in the southern Balkans, dated to 270,000 BC, is to be found in the Petralona cave, all three stages of the stone age are represented in Greece, for example in the Franchthi Cave. Neolithic settlements in Greece, dating from the 7th millennium BC, are the oldest in Europe by several centuries and these civilizations possessed writing, the Minoans writing in an undeciphered script known as Linear A, and the Mycenaeans in Linear B, an early form of Greek. The Mycenaeans gradually absorbed the Minoans, but collapsed violently around 1200 BC and this ushered in a period known as the Greek Dark Ages, from which written records are absent. The end of the Dark Ages is traditionally dated to 776 BC, the Iliad and the Odyssey, the foundational texts of Western literature, are believed to have been composed by Homer in the 7th or 8th centuries BC. With the end of the Dark Ages, there emerged various kingdoms and city-states across the Greek peninsula, in 508 BC, Cleisthenes instituted the worlds first democratic system of government in Athens
7.
Antikythera
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Antikythera or Anticythera is a Greek island lying on the edge of the Aegean Sea, between Crete and Peloponnese. Since the 2011 local government reform it is part of the municipality of Kythera island, Antikythera may also refer to the Antikythera Strait, through which modified Mediterranean water enters the Sea of Crete. Its land area is 20.43 square kilometres, and it lies 38 kilometres south-east of Kythira and it is the most distant part of the Attica region from its heart in the Athens metropolitan area. It is lozenge-shaped,10.5 km NNW to SSE by 3.4 km ENE to WSW and it is notable for being the location of the discovery of the Antikythera mechanism and for the historical Antikythera wreck. Its main settlement and port is Potamós, the only other settlements are Galanianá, and Charchalianá. Antikythera is sporadically visited by the LANE Lines ferry Vitsentzos Kornaros on its route between Piraeus and Kissamos-Kastelli on Crete, the earliest known inhabitants were likely seasonal hunters who traveled there to exploit the presence of migratory birds. The population of the island changed frequently as it was settled and abandoned several times. In antiquity, the island of Antikythera was known as Aigila or Ogylos, between the 4th and 1st centuries BC, it was used as a base by a group of Cilician pirates until their destruction by Pompey the Great. Their fort can still be seen atop a cliff to the northeast of the island, the archaeology of the island has been thoroughly surveyed and the data made openly available for further study. Antikythera is most famous for being the location of the 1900 discovery of the Antikythera wreck, from which the Antikythera Ephebe, the Antikythera mechanism is an ancient mechanical calculator designed to calculate astronomical positions which has been dated to about 205 BC. Technological artifacts of similar complexity did not appear until a thousand years later, Antikythera is a very important stop-over site for migratory birds during their seasonal movements, due to its geographical position and certain features. Furthermore, the hosts the largest breeding colony of Eleonoras falcon in the world. The importance of Antikythira for studying bird migration led to the creation of Antikythera Bird Observatory by the Hellenic Ornithological Society, the island also has a large population of wild goats
8.
Analog computer
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An analog computer is a form of computer that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved. In contrast, digital computers represent varying quantities symbolically, as their values change. As an analog computer does not use values, but rather continuous values, processes cannot be reliably repeated with exact equivalence. Unlike digital signal processing, analog computers do not suffer from the quantization noise, Analog computers were widely used in scientific and industrial applications where digital computers of the time lacked sufficient performance. Analog computers can have a wide range of complexity. Slide rules and nomographs are the simplest, while naval gunfire control computers, systems for process control and protective relays used analog computation to perform control and protective functions. More complex applications, such as synthetic aperture radar, remained the domain of analog computing well into the 1980s, setting up an analog computer required scale factors to be chosen, along with initial conditions—that is, starting values. Another essential was creating the network of interconnections between computing elements. Sometimes it was necessary to re-think the structure of the problem so that the computer would function satisfactorily, no variables could be allowed to exceed the computers limits, and differentiation was to be avoided, typically by rearranging the network of interconnects, using integrators in a different sense. Running an electronic computer, assuming a satisfactory setup, started with the computer held with some variables fixed at their initial values. Moving a switch released the holds and permitted the problem to run, in some instances, the computer could, after a certain running time interval, repeatedly return to the initial-conditions state to reset the problem, and run it again. This is a list of examples of early computation devices which are considered to be precursors of the modern computers, some of them may even have been dubbed as computers by the press, although they may fail to fit the modern definitions. The south-pointing chariot can be considered the earliest analog computer and it was a mechanical-geared wheeled vehicle used for to discern the southern cardinal direction. The Antikythera mechanism was an orrery and is claimed to be the earliest known mechanical analog computer. It was designed to calculate astronomical positions and it was discovered in 1901 in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to circa 100 BC. Devices of a level of complexity comparable to that of the Antikythera mechanism would not reappear until a thousand years later, many mechanical aids to calculation and measurement were constructed for astronomical and navigation use. The planisphere was a star chart invented by Abū Rayḥān al-Bīrūnī in the early 11th century, the astrolabe was invented in the Hellenistic world in either the 1st or 2nd centuries BC and is often attributed to Hipparchus. A combination of the planisphere and dioptra, the astrolabe was effectively an analog computer capable of working out different kinds of problems in spherical astronomy
9.
Antikythera mechanism
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Found housed in a 340 millimetres ×180 millimetres ×90 millimetres wooden box, the device is a complex clockwork mechanism composed of at least 30 meshing bronze gears. Its remains were found as one lump, later separated in three fragments, which are now divided into 82 separate fragments after conservation works. Four of these fragments contain gears, while inscriptions are found on many others, the largest gear is approximately 140 millimetres in diameter and originally had 223 teeth. The artefact was recovered probably in July 1901 from the Antikythera shipwreck off the Greek island of Antikythera. Believed to have designed and constructed by Greek scientists, the instrument has been dated either between 150 and 100 BC, or, according to a more recent view, in 205 BC. All known fragments of the Antikythera mechanism are kept at the National Archaeological Museum, in Athens, the Antikythera mechanism was discovered in 45 metres of water in the Antikythera shipwreck off Point Glyphadia on the Greek island of Antikythera. All were transferred to the National Museum of Archaeology in Athens for storage, merely a lump of corroded bronze and wood at the time, the mechanism went unnoticed for two years while museum staff worked on piecing together more obvious statues. On 17 May 1902, archaeologist Valerios Stais was examining the finds, investigations into the object were soon dropped until British science historian and Yale University professor, Derek J. de Solla Price became interested in it in 1951. In 1971, both Price and Greek nuclear physicist Charalampos Karakalos made X-ray and gamma-ray images of the 82 fragments, Price published an extensive 70-page paper on their findings in 1974. Generally referred to as the first known computer, the quality and complexity of the mechanisms manufacture suggests it has undiscovered predecessors made during the Hellenistic period. Its construction relied upon theories of astronomy and mathematics developed by Greek astronomers, in 1974, Derek de Solla Price concluded from gear settings and inscriptions on the mechanisms faces that it was made about 87 BC and lost only a few years later. Jacques Cousteau and associates visited the wreck in 1976 and recovered coins dated to between 76 and 67 BC, though its advanced state of corrosion has made it impossible to perform an accurate compositional analysis, it is believed the device was made of a low-tin bronze alloy. All its instructions are written in Koine Greek, and the consensus among scholars is that the mechanism was made in the Greek-speaking world, syracuse was a colony of Corinth and the home of Archimedes, which might imply a connection with the school of Archimedes. With its many scrolls of art and science, it was second in only to the Library of Alexandria during the Hellenistic period. A busy trading port in antiquity, Rhodes was also a centre of astronomy and mechanical engineering, home to the astronomer Hipparchus and that the mechanism uses Hipparchuss theory for the motion of the moon suggests the possibility he may have designed, or at least worked on it. He regarded the Antikythera mechanism as more valuable than the Mona Lisa, in 2014, a study by Carman and Evans argued for a new dating of approximately 200 BC. Moreover, according to Carman and Evans, the Babylonian arithmetic style of prediction fits much better with the devices predictive models than the traditional Greek trigonometric style, further dives are being undertaken in the hope of discovering more of the mechanism. The original mechanism apparently came out of the Mediterranean as a single encrusted piece, soon afterward it fractured into three major pieces
10.
National Archaeological Museum, Athens
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The National Archaeological Museum in Athens houses some of the most important artifacts from a variety of archaeological locations around Greece from prehistory to late antiquity. It is considered one of the greatest museums in the world, the first national archaeological museum in Greece was established by prime minister of Greece Ioannis Kapodistrias in Aigina in 1829. The initial name for the museum was The Central Museum and it was renamed to its current name in 1881 by Prime Minister of Greece Charilaos Trikoupis. In 1887 the important archaeologist Valerios Stais became the museums curator, during World War II the museum was closed and the antiquities were sealed in special protective boxes and buried, in order to avoid their destruction and looting. In 1945 exhibits were displayed under the direction of Christos Karouzos. The south wing of the houses the Epigraphic Museum with the richest collection of inscriptions in the world. The inscriptions museum expanded between 1953 and 1960 with the designs of Patroklos Karantinos. The museum has an imposing neo-classical design which was popular in Europe at the time and is in accordance with the classical style artifacts that it houses. The initial plan was conceived by the architect Ludwig Lange and it was modified by Panagis Kalkos who was the main architect, Armodios Vlachos. At the front of the museum there is a large neo-classic design garden which is decorated with sculptures, the building has undergone many expansions. These expansions were necessary to accommodate the growing collection of artifacts. The most recent refurbishment of the museum more than 1.5 years to complete. The Minoan frescoes rooms opened to the public in 2005, on May 2008 the Culture Minister Mihalis Liapis inaugurated the much anticipated collection of Egyptian antiquities and the collection of Eleni and Antonis Stathatos. Today, there is a discussion regarding the need to further expand the museum to adjacent areas. A new plan has made for a subterranean expansion at the front of the museum. The museums collections are organised in sections, The prehistoric collection displays objects from the Neolithic era, Early and Mid-Bronze age, objects classified as Cycladic and Mycenaean art. There are ceramic finds from various important Neolithic sites such as Dimini and Sesclo from middle Helladic ceramics from Boeotia, Attica, some objects from Heinrich Schliemann excavations in Troy are also on display. Cycladic collection features the famous marble figurines from the Aegean islands of Delos and Keros including the Lutist, of great interest are the two golden cups from Vafeio showing a scene of the capture of a bull
