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Beacon Hill Elementary School
A beacon is an intentionally conspicuous device designed to attract attention to a specific location. A common example is the lighthouse, which draws attention to a fixed point that can be used to navigate around obstacles or into port. More modern examples include a variety of radio beacons that can be read on radio direction finders in all weather, and radar transponders that appear on radar displays. Beacons can also be combined with semaphoric or other indicators to provide important information, such as the status of an airport, by the colour and rotational pattern of its airport beacon, or of pending weather as indicated on a weather beacon mounted at the top of a tall building or similar site. When used in such fashion, beacons can be considered a form of optical telegraphy. For navigation Beacons help guide navigators to their destinations. Types of navigational beacons include radar reflectors, radio beacons, sonic and visual signals. Visual beacons range from s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geodetic Datum
A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame) is a global datum reference or reference frame for precisely representing the position of locations on Earth or other planetary bodies by means of '' geodetic coordinates''. DatumsThe plural is not "data" in this case are crucial to any technology or technique based on spatial location, including geodesy, navigation, surveying, geographic information systems, remote sensing, and cartography. A horizontal datum is used to measure a location across the Earth's surface, in latitude and longitude or another coordinate system; a ''vertical datum'' is used to measure the elevation or depth relative to a standard origin, such as mean sea level (MSL). Since the rise of the global positioning system (GPS), the ellipsoid and datum WGS 84 it uses has supplanted most others in many applications. The WGS 84 is intended for global use, unlike most earlier datums. Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigational Aid
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space 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. History In the European medieval period, navigation was considered part of the set of '' seven mechanical arts'', none of which were used for long voyages across open ocean. Polynesian navigation is probably the earliest form of open-ocean navigation; it was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lefkada
Lefkada ( el, Λευκάδα, ''Lefkáda'', ), also known as Lefkas or Leukas ( Ancient Greek and Katharevousa: Λευκάς, ''Leukás'', modern pronunciation ''Lefkás'') and Leucadia, is a Greek island in the Ionian Sea on the west coast of Greece, connected to the mainland by a long causeway and floating bridge. The principal town of the island and seat of the municipality is Lefkada. It is situated on the northern part of the island, approximately 25 minutes by automobile away from Aktion National Airport. The island is part of the regional unit of Lefkada. Geography Lefkada measures from north to south, and from east to west. The area of the island is about , the area of the municipality (including the islands Kalamos, Kastos and several smaller islets) is . Its highest point is the mountain Stavrota, above sea level, situated in the middle of the island. The east coast section of the island has small resorts of Lygia, Nikiana and Perigiali, all north of Nidri, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corcyra
Corfu (, ) or Kerkyra ( el, Κέρκυρα, Kérkyra, , ; ; la, Corcyra.) is a Greek island in the Ionian Sea, of the Ionian Islands, and, including its small satellite islands, forms the margin of the northwestern frontier of Greece. The island is part of the Corfu regional unit, and is administered by three municipalities with the islands of Othonoi, Ereikoussa, and Mathraki.https://corfutvnews.gr/diaspasi-deite-tin-tropologia/ The principal city of the island (pop. 32,095) is also named Corfu. Corfu is home to the Ionian University. The island is bound up with the history of Greece from the beginnings of Greek mythology, and is marked by numerous battles and conquests. Ancient Korkyra took part in the Battle of Sybota which was a catalyst for the Peloponnesian War, and, according to Thucydides, the largest naval battle between Greek city states until that time. Thucydides also reports that Korkyra was one of the three great naval powers of fifth century BC Greece, along ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peloponnese
The Peloponnese (), Peloponnesus (; el, Πελοπόννησος, Pelopónnēsos,(), or Morea is a peninsula and geographic region in southern Greece. It is connected to the central part of the country by the Isthmus of Corinth land bridge which separates the Gulf of Corinth from the Saronic Gulf. From the late Middle Ages until the 19th century the peninsula was known as the Morea ( grc-x-byzant, Μωρέας), (Morèas) a name still in colloquial use in its demotic form ( el, Μωριάς, links=no), (Moriàs). The peninsula is divided among three administrative regions: most belongs to the Peloponnese region, with smaller parts belonging to the West Greece and Attica regions. Geography The Peloponnese is a peninsula located at the southern tip of the mainland, in area, and constitutes the southernmost part of mainland Greece. It is connected to the mainland by the Isthmus of Corinth, where the Corinth Canal was constructed in 1893. However, it is also connected to the ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peloponnesian War
The Peloponnesian War (431–404 BC) was an ancient Greek war fought between Athens and Sparta and their respective allies for the hegemony of the Greek world. The war remained undecided for a long time until the decisive intervention of the Persian Empire in support of Sparta. Led by Lysander, the Spartan fleet built with Persian subsidies finally defeated Athens and started a period of Spartan hegemony over Greece. Historians have traditionally divided the war into three phases. The first phase (431–421 BC) was named the Ten Years War, or the Archidamian War, after the Spartan king Archidamus II, who launched several invasions of Attica with the full hoplite army of the Peloponnesian League, the alliance network dominated by Sparta. However, the Long Walls of Athens rendered this strategy ineffective, while the superior navy of the Delian League (Athens' alliance) raided the Peloponnesian coast to trigger rebellions within Sparta. The precarious Peace of Nicias ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thucydides
Thucydides (; grc, , }; BC) was an Athenian historian and general. His '' History of the Peloponnesian War'' recounts the fifth-century BC war between Sparta and Athens until the year 411 BC. Thucydides has been dubbed the father of " scientific history" by those who accept his claims to have applied strict standards of impartiality and evidence-gathering and analysis of cause and effect, without reference to intervention by the gods, as outlined in his introduction to his work. He also has been called the father of the school of political realism, which views the political behavior of individuals and the subsequent outcomes of relations between states as ultimately mediated by, and constructed upon, fear and self-interest. His text is still studied at universities and military colleges worldwide. The Melian dialogue is regarded as a seminal work of international relations theory, while his version of Pericles' Funeral Oration is widely studied by political theorists, his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marquess Of Shen (King You Of Zhou Era)
The Marquess of Shen ( Chinese: , p ''Shēnhóu''; d. 771 BCE) was a Qiang ruler of Shen during China’s Zhou dynasty. A vassal state of the Zhou, Shen state covered the area of modern-day Nanyang in Henan. One of the Marquess of Shen’s daughters married the Zhou King You. As Queen Shen, she gave birth to Crown Prince Yijiu, but another consort named Bao Si persuaded the king to banish the queen and favor her son Bofu over Yijiu. Furious, the Marquess of Shen allied with the Zeng and Quanrong barbarians to attack the Zhou capital Haojing. King You lit beacons to summon his nobles, but none came and he was killed at the foot of Mount Li near modern-day Xi'an. Thereafter, the Marquesses of Shen, Zeng, and Xu enthroned Yijiu as King Ping of Zhou in Shen. This marked the end of the Western Zhou and the beginning of the Eastern Eastern may refer to: Transportation *China Eastern Airlines, a current Chinese airline based in Shanghai *Eastern Air, form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Zhou
The Western Zhou ( zh, c=, p=Xīzhōu; c. 1045 BC – 771 BC) was a royal dynasty of China and the first half of the Zhou dynasty. It began when King Wu of Zhou overthrew the Shang dynasty at the Battle of Muye and ended when the Quanrong nomads sacked its capital Haojing and killed King You of Zhou in 771 BC. The Western Zhou early state was successful for about seventy-five years and then slowly lost power. The former Shang lands were divided into hereditary fiefs which became increasingly independent of the king. In 771 BC, the Zhou were driven out of the Wei River valley; afterwards real power was in the hands of the king's nominal vassals. Civil war Few records survive from this early period and accounts from the Western Zhou period cover little beyond a list of kings with uncertain dates. King Wu died two or three years after the conquest. Because his son, King Cheng of Zhou was young, his brother, the Duke of Zhou Ji Dan assisted the young and inexperienced kin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King You Of Zhou
King You of Zhou (; 795–771 BC), personal name Ji Gongsheng, was the twelfth king of the Chinese Zhou dynasty and the last of Western Zhou Dynasty. He reigned from 781 to 771 BC. History In 780 BC, a major earthquake hit Guanzhong. A soothsayer named Bo Yangfu (伯陽甫) considered this an omen foretelling the destruction of the Zhou Dynasty. In 779 BC, a concubine named Bao Si entered the palace and came into the King You's favour. She bore him a son named Bofu. King You deposed Queen Shen (申后) and Crown Prince Yijiu. He made Baosi the new queen and Bofu the new crown prince. It is said that Baosi did not laugh easily. After trying many methods and failing, King You tried to amuse his favorite queen by lighting warning beacons and fooling his nobles into thinking that the Quanrong nomads were about to attack. The nobles arrived at the castle only to find themselves laughed at by Baosi. Even after King You had impressed Baosi, he continued to abuse his use of warnin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Wall
The Great Wall of China (, literally "ten thousand ''li'' wall") is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe. Several walls were built from as early as the 7th century BC, with selective stretches later joined by Qin Shi Huang (220–206 BC), the first emperor of China. Little of the Qin wall remains. Later on, many successive dynasties built and maintained multiple stretches of border walls. The best-known sections of the wall were built by the Ming dynasty (1368–1644). Apart from defense, other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Column Of Trajan
Trajan's Column ( it, Colonna Traiana, la, Columna Traiani) is a Roman triumphal column in Rome, Italy, that commemorates Roman emperor Trajan's victory in the Dacian Wars. It was probably constructed under the supervision of the architect Apollodorus of Damascus at the order of the Roman Senate. It is located in Trajan's Forum, north of the Roman Forum. Completed in AD 113, the freestanding column is most famous for its spiral bas relief, which depicts the wars between the Romans and Dacians (101–102 and 105–106). Its design has inspired numerous victory columns, both ancient and modern. The structure is about in height, including its large pedestal. The shaft is made from a series of 20 colossal Carrara marble drums, each weighing about 32 tons, with a diameter of . The frieze winds around the shaft 23 times. Inside the shaft, a spiral staircase of 185 steps provides access to a viewing deck at the top. The capital block of Trajan's Column weighs 53.3 tons, and had t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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