Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth, it has only one-eighth the average density of Earth, but with its larger volume Saturn is over 95 times more massive. Saturn is named after the Roman god of agriculture. Saturn's interior is composed of a core of iron–nickel and rock; this core is surrounded by a deep layer of metallic hydrogen, an intermediate layer of liquid hydrogen and liquid helium, a gaseous outer layer. Saturn has a pale yellow hue due to ammonia crystals in its upper atmosphere. Electrical current within the metallic hydrogen layer is thought to give rise to Saturn's planetary magnetic field, weaker than Earth's, but has a magnetic moment 580 times that of Earth due to Saturn's larger size. Saturn's magnetic field strength is around one-twentieth of Jupiter's; the outer atmosphere is bland and lacking in contrast, although long-lived features can appear.
Wind speeds on Saturn can reach 1,800 km/h, higher than on Jupiter, but not as high as those on Neptune. In January 2019, astronomers reported that a day on the planet Saturn has been determined to be 10h 33m 38s + 1m 52s− 1m 19s , based on studies of the planet's C Ring; the planet's most famous feature is its prominent ring system, composed of ice particles, with a smaller amount of rocky debris and dust. At least 62 moons are known to orbit Saturn, of which 53 are named; this does not include the hundreds of moonlets in the rings. Titan, Saturn's largest moon, the second-largest in the Solar System, is larger than the planet Mercury, although less massive, is the only moon in the Solar System to have a substantial atmosphere. Saturn is a gas giant because it is predominantly composed of helium, it lacks a definite surface. Saturn's rotation causes it to have the shape of an oblate spheroid, its equatorial and polar radii differ by 10%: 60,268 km versus 54,364 km. Jupiter and Neptune, the other giant planets in the Solar System, are oblate but to a lesser extent.
The combination of the bulge and rotation rate means that the effective surface gravity along the equator, 8.96 m/s2, is 74% that at the poles and is lower than the surface gravity of Earth. However, the equatorial escape velocity of nearly 36 km/s is much higher than that for Earth. Saturn is the only planet of the Solar System, less dense than water—about 30% less. Although Saturn's core is denser than water, the average specific density of the planet is 0.69 g/cm3 due to the atmosphere. Jupiter has 318 times Earth's mass, Saturn is 95 times Earth's mass. Together and Saturn hold 92% of the total planetary mass in the Solar System. Despite consisting of hydrogen and helium, most of Saturn's mass is not in the gas phase, because hydrogen becomes a non-ideal liquid when the density is above 0.01 g/cm3, reached at a radius containing 99.9% of Saturn's mass. The temperature and density inside Saturn all rise toward the core, which causes hydrogen to be a metal in the deeper layers. Standard planetary models suggest that the interior of Saturn is similar to that of Jupiter, having a small rocky core surrounded by hydrogen and helium with trace amounts of various volatiles.
This core is more dense. Examination of Saturn's gravitational moment, in combination with physical models of the interior, has allowed constraints to be placed on the mass of Saturn's core. In 2004, scientists estimated that the core must be 9–22 times the mass of Earth, which corresponds to a diameter of about 25,000 km; this is surrounded by a thicker liquid metallic hydrogen layer, followed by a liquid layer of helium-saturated molecular hydrogen that transitions to a gas with increasing altitude. The outermost layer consists of gas. Saturn has a hot interior, reaching 11,700 °C at its core, it radiates 2.5 times more energy into space than it receives from the Sun. Jupiter's thermal energy is generated by the Kelvin–Helmholtz mechanism of slow gravitational compression, but such a process alone may not be sufficient to explain heat production for Saturn, because it is less massive. An alternative or additional mechanism may be generation of heat through the "raining out" of droplets of helium deep in Saturn's interior.
As the droplets descend through the lower-density hydrogen, the process releases heat by friction and leaves Saturn's outer layers depleted of helium. These descending droplets may have accumulated into a helium shell surrounding the core. Rainfalls of diamonds have been suggested to occur within Saturn, as well as in Jupiter and ice giants Uranus and Neptune; the outer atmosphere of Saturn contains 3.25 % helium by volume. The proportion of helium is deficient compared to the abundance of this element in the Sun; the quantity of elements heavier than helium is not known but the proportions are assumed to match the primordial abundances from the formation of the Solar System. The total mass of these heavier elements is estimated to be 19–31 times the mass of the Earth, with a significant fraction located in Saturn's core region. Trace amounts of ammonia, ethane, propane and methane have been detected in Saturn's atmosphere; the upper clouds are composed of ammonia crystals, while the lower level clouds appear to consist of either ammonium hydrosulfide or water.
Ultraviolet radiation from the Sun causes methane ph
Germany the Federal Republic of Germany, is a country in Central and Western Europe, lying between the Baltic and North Seas to the north, the Alps to the south. It borders Denmark to the north and the Czech Republic to the east and Switzerland to the south, France to the southwest, Luxembourg and the Netherlands to the west. Germany includes 16 constituent states, covers an area of 357,386 square kilometres, has a temperate seasonal climate. With 83 million inhabitants, it is the second most populous state of Europe after Russia, the most populous state lying in Europe, as well as the most populous member state of the European Union. Germany is a decentralized country, its capital and largest metropolis is Berlin, while Frankfurt serves as its financial capital and has the country's busiest airport. Germany's largest urban area is the Ruhr, with its main centres of Essen; the country's other major cities are Hamburg, Cologne, Stuttgart, Düsseldorf, Dresden, Bremen and Nuremberg. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity.
A region named Germania was documented before 100 AD. During the Migration Period, the Germanic tribes expanded southward. Beginning in the 10th century, German territories formed a central part of the Holy Roman Empire. During the 16th century, northern German regions became the centre of the Protestant Reformation. After the collapse of the Holy Roman Empire, the German Confederation was formed in 1815; the German revolutions of 1848–49 resulted in the Frankfurt Parliament establishing major democratic rights. In 1871, Germany became a nation state when most of the German states unified into the Prussian-dominated German Empire. After World War I and the revolution of 1918–19, the Empire was replaced by the parliamentary Weimar Republic; the Nazi seizure of power in 1933 led to the establishment of a dictatorship, the annexation of Austria, World War II, the Holocaust. After the end of World War II in Europe and a period of Allied occupation, Austria was re-established as an independent country and two new German states were founded: West Germany, formed from the American and French occupation zones, East Germany, formed from the Soviet occupation zone.
Following the Revolutions of 1989 that ended communist rule in Central and Eastern Europe, the country was reunified on 3 October 1990. Today, the sovereign state of Germany is a federal parliamentary republic led by a chancellor, it is a great power with a strong economy. As a global leader in several industrial and technological sectors, it is both the world's third-largest exporter and importer of goods; as a developed country with a high standard of living, it upholds a social security and universal health care system, environmental protection, a tuition-free university education. The Federal Republic of Germany was a founding member of the European Economic Community in 1957 and the European Union in 1993, it is part of the Schengen Area and became a co-founder of the Eurozone in 1999. Germany is a member of the United Nations, NATO, the G7, the G20, the OECD. Known for its rich cultural history, Germany has been continuously the home of influential and successful artists, musicians, film people, entrepreneurs, scientists and inventors.
Germany has a large number of World Heritage sites and is among the top tourism destinations in the world. The English word Germany derives from the Latin Germania, which came into use after Julius Caesar adopted it for the peoples east of the Rhine; the German term Deutschland diutisciu land is derived from deutsch, descended from Old High German diutisc "popular" used to distinguish the language of the common people from Latin and its Romance descendants. This in turn descends from Proto-Germanic *þiudiskaz "popular", derived from *þeudō, descended from Proto-Indo-European *tewtéh₂- "people", from which the word Teutons originates; the discovery of the Mauer 1 mandible shows that ancient humans were present in Germany at least 600,000 years ago. The oldest complete hunting weapons found anywhere in the world were discovered in a coal mine in Schöningen between 1994 and 1998 where eight 380,000-year-old wooden javelins of 1.82 to 2.25 m length were unearthed. The Neander Valley was the location where the first non-modern human fossil was discovered.
The Neanderthal 1 fossils are known to be 40,000 years old. Evidence of modern humans dated, has been found in caves in the Swabian Jura near Ulm; the finds included 42,000-year-old bird bone and mammoth ivory flutes which are the oldest musical instruments found, the 40,000-year-old Ice Age Lion Man, the oldest uncontested figurative art discovered, the 35,000-year-old Venus of Hohle Fels, the oldest uncontested human figurative art discovered. The Nebra sky disk is a bronze artefact created during the European Bronze Age attributed to a site near Nebra, Saxony-Anhalt, it is part of UNESCO's Memory of the World Programme. The Germanic tribes are thought to date from the Pre-Roman Iron Age. From southern Scandinavia and north Germany, they expanded south and west from the 1st century BC, coming into contact with the Celtic tribes of Gaul as well
Sunday is the day of the week between Saturday and Monday. Sunday is a day of rest in most Western countries, as a part of the weeknight. For most observant Christians, Sunday is observed as a day of worship and rest, holding it as the Lord's Day and the day of Christ's resurrection. In some Muslim countries and Israel, Sunday is the first work day of the week. According to the Hebrew calendar and traditional Christian calendars, Sunday is the first day of the week, but according to the International Organization for Standardization ISO 8601, Sunday is the seventh day of the week. The name "Sunday", the day of the Sun, is derived from Hellenistic astrology, where the seven planets, known in English as Saturn, Mars, the Sun, Venus and the Moon, each had an hour of the day assigned to them, the planet, regent during the first hour of any day of the week gave its name to that day. During the 1st and 2nd century, the week of seven days was introduced into Rome from Egypt, the Roman names of the planets were given to each successive day.
Germanic peoples seem to have adopted the week as a division of time from the Romans, but they changed the Roman names into those of corresponding Teutonic deities. Hence, the dies Solis became Sunday; the English noun Sunday derived sometime before 1250 from sunedai, which itself developed from Old English Sunnandæg, cognate to other Germanic languages, including Old Frisian sunnandei, Old Saxon sunnundag, Middle Dutch sonnendach, Old High German sunnun tag, Old Norse sunnudagr. The Germanic term is a Germanic interpretation of Latin dies solis, a translation of the Ancient Greek heméra helíou; the p-Celtic Welsh language translates the Latin "day of the sun" as dydd Sul. In most Indian languages, the word for Sunday is Ravivāra or Adityavāra or its derived forms — vāra meaning day and Ravi both being a style for Surya i.e. the Sun and Suryadeva the chief solar deity and one of the Adityas. Ravivāra is first day cited in Jyotisha, which provides logical reason for giving the name of each week day.
In the Thai solar calendar of Thailand, the name is derived from Aditya, the associated colour is red. In Russian the word for Sunday is Воскресенье meaning "Resurrection". In other Slavic languages the word means "no work", for example Polish: Niedziela, Ukrainian: Недiля, Belorussian: Нядзеля, Croatian: nedjelja and Slovenian: Nedelja, Czech: Neděle, Bulgarian: Неделя; the Modern Greek word for Sunday, Greek: Κυριακή, is derived from Greek: Κύριος due to its liturgical significance as the day commemorating the resurrection of Jesus Christ, i.e. The Lord's Day. In Korean, Sunday is called 일요일 Il-yo-Il, meaning "day of sun"; the international standard ISO 8601 for representation of dates and times, states that Sunday is the seventh and last day of the week. This method of representing dates and times unambiguously was first published in 1988. In the Judaic, some Christian, as well as in some Islamic tradition, Sunday has been considered the first day of the week. A number of languages express this position either by the name for the day or by the naming of the other days.
In Hebrew it is called יום ראשון yom rishon, in Arabic الأحد al-ahad, in Persian and related languages یکشنبه yek-shanbe, all meaning "first". In Greek, the names of the days Monday, Tuesday and Thursday mean "second", "third", "fourth", "fifth" respectively; this leaves Sunday in the first position of the week count. The current Greek name for Sunday, Κυριακή, means "Lord's Day" coming from the word Κύριος, the Greek word for "Lord". In Portuguese, where the days from Monday to Friday are counted as "segunda-feira", "terça-feira", "quarta-feira", "quinta-feira" and "sexta-feira", while Sunday itself similar to Greek has the name of "Lord's Day". In Vietnamese, the working days in the week are named as: "Thứ Hai", "Thứ Ba", "Thứ Tư", "Thứ Năm", "Thứ Sáu", "Thứ Bảy". Sunday is called "Chủ Nhật", a corrupted form of "Chúa Nhật" meaning "Lord's Day"; some colloquial text in the south of Vietnam and from the church may still use the old form to mean Sunday. In German, Wednesday is called "Mittwoch" "mid-week", implying that weeks run from Sunday to Saturday.
The name is similar in the Romance Languages. In Italian, Sunday is called "domenica", which means "Lord's Day". One finds similar cognates in French, where the name is "dimanche", as well as Romanian and Spanish and Portuguese. Slavic languages implicitly number Monday as not two. Russian воскресение means "resurrection". In Old Russian Sunday was called неделя "free day" or "day with no work", but in the contemporary language this word means "week". Hungarian péntek is a Slavic loanword, so the correlation with "five" is not evident to Hungarians. Hungarians use Vasárnap for Sunday, which means "market day". In the Maltese language, due to its Siculo-Arabic origin, Sunday is called "Il-Ħadd", a corruption of "wieħed" meaning "one". Monday is "It-Tnejn" meaning "two". Tuesday is "It-Tlieta", Wednesday is "L-Erbgħa" and Thursday is "Il-Ħamis". In Armenian, Monday is meaning 2nd day of the week, Tuesday 3rd day, Wednesday 4th day, Thursday (Hingsh
A Treatise on the Astrolabe
A Treatise on the Astrolabe is a medieval instruction manual on the astrolabe by Geoffrey Chaucer. It describes both the form and the proper use of the instrument, stands out as a prose technical work from a writer better known for poetry, written in English rather than the more typical Latin; the Treatise is considered the "oldest work in English written upon an elaborate scientific instrument". It is admired for its clarity in explaining difficult concepts—although modern readers lacking an actual astrolabe may find the details of the astrolabe difficult to understand. Robinson believes that it indicates that had Chaucer written more composed prose it would have been superior to his translations of Boece and Melibee. Chaucer’s exact source is undetermined but most of his ‘conclusions’ go back, directly or indirectly, to Compositio et Operatio Astrolabii, a Latin translation of Messahala's Arabic treatise of the 8th century, his description of the instrument amplifies Messahala’s, Chaucer’s indebtedness to Messahala was recognised by John Selden and established by Walter William Skeat.
Mark Harvey Liddell held Chaucer drew on De Sphaera of John de Sacrobosco for the substance of his astronomical definitions and descriptions, but the non-correspondence in language suggests the probable use of an alternative compilation. A collotype facsimile of the second part of Messahala’s Latin text is found in Skeat’s Treatise On The Astrolabe. and in Gunther's Chaucer and Messahalla on the Astrolabe. Paul Kunitzsch argued that the treatise on the astrolabe long attributed to Mashallah is in fact written by Ibn al-Saffar; the work is written in free flowing contemporary English, today referred to as middle English. Chaucer explains this departure from the norm thus: "This treatis... wol I shewe the... in Englissh, for Latyn ne canst thou yit but small"Chaucer proceeds to labour the point somewhat: "Grekes... in Grek. He continues to explain that it easier for a child to understand things in his own language than struggle with unfamiliar grammar, a commonplace idea today but radical in the fourteenth century.
He appeals to Royalty in an early version of the phrase "the King's English": "And preie God save the King, lord of this language..." Skeat identifies 22 manuscripts of varying quality. The best he labels A, B and C which are MS. Dd. 3.53 in the Cambridge University Library, MS. E Museo 54 in the Bodleian Library and MS. Rawlinson, Misc. 1262 in the Bodleian. A and B were written by the same scribe, but A has been corrected by another hand. Skeat observes that the errors are just those described in "Chaucers Wordes unto Adam, His Owne Scriveyn": "So ofte a-daye I mot thy werk renewe, "It to correcte and eek to rubbe and scrape; this latter scribe Skeat believes to be a better writer than the first. To this second writer was the insertion of diagrams entrusted. A and B were written in London about the year 1400, some 9 years after the original composition. Manuscript C is early 1420 and agrees with A. Chaucer opens with the words "Lyte Lowys my sone". In the past a question arose whether the Lowys was Chaucer's son or some other child he was in close contact with.
Kittredge suggested that it could be Lewis Clifford, a son of a friend and possible a godson of Chaucer's. As evidence he advanced that Lewis Clifford died in October 1391, the year of the composition, which could explain its abandonment. Robinson reports though the finding of a document by Professor Manly "recently" which links one Lewis Chaucer with Geoffrey's eldest child Thomas Chaucer; the likelihood therefore is. Chaucer had an eye to the wider public as well. In the prologue he says: Now wol I preie mekely every discret persone that redith or herith this litel tretys..." The work was planned to have an introduction and five sections: A description of the astrolabe A rudimentary course in using the instrument Various tables of longitudes, declinations, etc. A "theorike" of the motion of the celestial bodies, in particular a table showing the "very moving of the moon" An introduction to the broader field of "astrologie," a word which at the time referred to the entire span of what we now divide into astrology and astronomy.
Part 1 is extant. Part 2 is extant with certain caveats described below. Part 3, if it existed, is not extant as part of the Treatise. Part 4 was, in the opinion of Skeat never written. Part 5 was never written which Skeat approves of. Indeed, he draws attention to Chaucer's comment at the end of conclusion 4: "Natheles these ben observaunces of judicial matere and rytes of payens, in whiche my spirit hath no feith, no knowing of her horoscopum." The whole of this section describes the form of an astrolabe. The astrolabe is based on a large plate, arranged to hang vertically from a thumb ring, it has "a large hool, that resceiveth in hir wombe the thin plates". The back of the astrolabe is engraved with various scales. Mounted on the back is a sighting rule "a brod rule, that hath on either end a square plate perced with certein holes". To hold it all together there is a "pyn" with a "littel wegge" (w
Westphalia is a region in northwestern Germany and one of the three historic parts of the state of North Rhine-Westphalia. It has an area of 7.9 million inhabitants. The region is identical to the Province of Westphalia, a part of the Kingdom of Prussia from 1815 to 1918 and the Free State of Prussia from 1918 to 1946. In 1946, Westphalia merged with the Northern Rhineland, another former part of Prussia, to form the newly created state of North Rhine-Westphalia. In 1947, the state with its two historic parts was joined by a third one: Lippe, a former principality and free state. All of the seventeen districts and nine independent cities of Westphalia and Lippe's only district are members of the Westphalia-Lippe Regional Association. Previous to the formation of Westphalia as a province of Prussia and state part of North Rhine-Westphalia, the term "Westphalia" was applied to different territories of different sizes such as a part of the ancient Duchy of Saxony, the Duchy of Westphalia or the Kingdom of Westphalia.
The Westphalian language, a variant of the German language, spreads beyond Westphalia's borders into southwestern Lower Saxony and northwestern Hesse. Being a part of the North German Plain, most of Westphalia's north is flat. In the south the German Central Uplands emerge. Westphalia is divided into the following landscapes. Flat to hilly: East Westphalia, Münsterland, eastern Ruhr Metropolitan Area, Tecklenburg Land, Westphalian Hellweg Hilly to mountainous: Westphalian part of the Sauerland, Wittgenstein Westphalia is the region in between the rivers Rhine and Weser, located both north and south of the Ruhr River. Other important rivers are the Lippe; the Langenberg and the Kahler Asten in the Sauerland part of the Rothaar Mountains are Westphalia's and North Rhine-Westphalia's highest mountains. The term "Westphalia" contrasts with the much less used term "Eastphalia", which covers the southeastern part of the present-day state of Lower Saxony, western Saxony-Anhalt and northern Thuringia.
Westphalia is divided into three governmental districts. These are subdivided into independent cities. All districts and independent cities of the governmental districts of Arnsberg and Münster are considered to be a part of Westphalia as a historic region; the District of Lippe as successor of the Free State of Lippe in the Governmental District of Detmold is rather considered to be a separate historic region. The traditional symbol of Westphalia is the Westphalian Steed: a white horse on a red field, it is derived from the Saxon Steed in the coat of arms of the medieval Duchy of Saxony which most of today's Westphalia was part of. In official contexts the coat of arms of Westphalia is being used by the Westphalia-Lippe Regional Association, which represents these two historic parts of North Rhine-Westphalia; the coat of arms of North Rhine-Westphalia uses the Westphalian Steed to represent Westphalia as one of its parts alongside the Lippish Rose representing Lippe and the Rhine River representing the Northern Rhineland.
Prussia used the Westphalian Steed in the coat of arms of its Province of Westphalia. The coat of arms of Lower Saxony uses a different version of the Saxon Steed since the state covers large parts of the Old Saxons' duchy; the colors of Westphalia are red. The flag of the Westphalia-Lippe Regional Association uses these colors with the Westphalian coat of arms in its center; the flag of North Rhine-Westphalia is a combination of the Northern Rhineland's colors green/white and the Westphalian white/red. The flag of the Prussian Province of Westphalia displayed the colors white and red; the flag of Lower Saxony shows the colors of the Saxon Steed. Composed in Iserlohn in 1886 by Emil Rittershaus, the Westfalenlied is an unofficial anthem of Westphalia. While the Northern Rhineland and Lippe are different historic territories of today's North Rhine-Westphalia, the old border between the former Rhine Province and the Province of Westphalia is a language border. While in Westphalia and Lippe, people tend to speak West Low German dialects and the Westphalian variant of the Low German language, Central German and Low Franconian dialects are being spoken in the Northern Rhineland.
These different regional identities are being emphasized by different majorities of denomination between Roman Catholics and Lutheran Protestants. The different majorities date back to the days of the territorial fragmentation of the Holy Roman Empire which existed until 1806; the Münsterland and the region around Paderborn for instance are still Catholic regions because of the former existence of the prince-bishoprics of Münster and Paderborn. The Lutheran Lippe was able to retain its independence as a small state within Germany in the form of a principality until 1918 and as a free state until 1946; this continues to influence the identity of its people who distinguish themselves from neighboring regions such as East Westphalia. In addition to these historic and religious aspects, there are some regional differences in culture and mentality; that is why many of the citizens of North Rhine-Westphalia rather see themselves either as "Rhinelanders", "Westphalians" or "Lippers" rather than as "North Rhine-Westphalians".
Westphalia is known for the 1648 Peace of Westphalia which ended the Thirty Years' War, as the two treaties were signed in Münster and Osnabrück. It is one of the regions that were part of all incarnations of the German state since the Early M
Geoffrey Chaucer was an English poet and author. Considered the greatest English poet of the Middle Ages, he is best known for The Canterbury Tales. Chaucer has been styled the "Father of English literature" and was the first writer buried in Poets' Corner of Westminster Abbey. Chaucer achieved fame in his lifetime as a philosopher and astronomer, composing the scientific A Treatise on the Astrolabe for his 10-year-old son Lewis, he maintained an active career in the civil service as a bureaucrat and diplomat. Among Chaucer's many other works are The Book of the Duchess, The House of Fame, The Legend of Good Women, Troilus and Criseyde, he is seen as crucial in legitimising the literary use of the Middle English vernacular at a time when the dominant literary languages in England were still French and Latin. Chaucer was born in London sometime around 1343, though the precise date and location remain unknown, his father and grandfather were both London vintners, several previous generations had been merchants in Ipswich.
His family name is derived from the French chausseur, meaning "shoemaker". In 1324, his father John Chaucer was kidnapped by an aunt in the hope of marrying the 12-year-old to her daughter in an attempt to keep property in Ipswich; the aunt was imprisoned and fined £250, equivalent to £200,000 today, which suggests that the family was financially secure. John Chaucer married Agnes Copton who inherited properties in 1349, including 24 shops in London from her uncle Hamo de Copton, described in a will dated 3 April 1354 and listed in the City Hustings Roll as "moneyer", said to be moneyer at the Tower of London. In the City Hustings Roll 110, 5, Ric II, dated June 1380, Chaucer refers to himself as me Galfridum Chaucer, filium Johannis Chaucer, Londonie. While records concerning the lives of his contemporary friends, William Langland and the Pearl Poet, are non-existent, since Chaucer was a public servant, his official life is well documented, with nearly five hundred written items testifying to his career.
The first of the "Chaucer Life Records" appears in 1357, in the household accounts of Elizabeth de Burgh, the Countess of Ulster, when he became the noblewoman's page through his father's connections, a common medieval form of apprenticeship for boys into knighthood or prestige appointments. The countess was married to Lionel, Duke of Clarence, the second surviving son of the king, Edward III, the position brought the teenage Chaucer into the close court circle, where he was to remain for the rest of his life, he worked as a courtier, a diplomat, a civil servant, as well as working for the king from 1389 to 1391 as Clerk of the King's Works. In 1359, in the early stages of the Hundred Years' War, Edward III invaded France and Chaucer travelled with Lionel of Antwerp, 1st Duke of Clarence, Elizabeth's husband, as part of the English army. In 1360, he was captured during the siege of Rheims. Edward paid £16 for his ransom, a considerable sum, Chaucer was released. After this, Chaucer's life is uncertain, but he seems to have travelled in France and Flanders as a messenger and even going on a pilgrimage to Santiago de Compostela.
Around 1366, Chaucer married Philippa Roet. She was a lady-in-waiting to Edward III's queen, Philippa of Hainault, a sister of Katherine Swynford, who became the third wife of John of Gaunt, it is uncertain how many children Chaucer and Philippa had, but three or four are most cited. His son, Thomas Chaucer, had an illustrious career, as chief butler to four kings, envoy to France, Speaker of the House of Commons. Thomas's daughter, married the Duke of Suffolk. Thomas's great-grandson, John de la Pole, Earl of Lincoln, was the heir to the throne designated by Richard III before he was deposed. Geoffrey's other children included Elizabeth Chaucy, a nun at Barking Abbey, Agnes, an attendant at Henry IV's coronation. Chaucer's "Treatise on the Astrolabe" was written for Lewis. According to tradition, Chaucer studied law in the Inner Temple at this time, he became a member of the royal court of Edward III as a valet de chambre, yeoman, or esquire on 20 June 1367, a position which could entail a wide variety of tasks.
His wife received a pension for court employment. He travelled abroad at least some of them in his role as a valet. In 1368, he may have attended the wedding of Lionel of Antwerp to Violante Visconti, daughter of Galeazzo II Visconti, in Milan. Two other literary stars of the era were in attendance: Petrarch. Around this time, Chaucer is believed to have written The Book of the Duchess in honour of Blanche of Lancaster, the late wife of John of Gaunt, who died in 1369 of the plague. Chaucer travelled to Picardy the next year as part of a military expedition. Numerous scholars such as Skeat and Rowland suggested that, on this Italian trip, he came into contact with Petrarch or Boccaccio, they introduced him to medieval the forms and stories of which he would use later. The purposes of a voyage in 1377 are mysterious, as details within the historical record conflict. Documents suggest it was a mission, along with Jean Froissart, to arrange a marriage between the future King Richard II and a French princess, thereby ending the Hundred Years War.
If this was the purpose of their trip, they seem to have been unsuccessful. In 1378, Richard II sent Chaucer as an envoy to the Visconti and to Sir John Hawkwood, English condottiere in Milan, it has been specu
An hour is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. The hour was established in the ancient Near East as a variable measure of 1⁄12 of the night or daytime; such seasonal, temporal, or unequal hours varied by latitude. The hour was subsequently divided into each of 60 seconds. Equal or equinoctial hours were taken as 1⁄24 of the day. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was separated from the Earth's rotation and defined in terms of the atomic or physical second. In the modern metric system, hours are an accepted unit of time defined as 3,600 atomic seconds. However, on rare occasions an hour may incorporate a positive or negative leap second, making it last 3,599 or 3,601 seconds, in order to keep it within 0.9 seconds of UT1, based on measurements of the mean solar day. The modern English word hour is a development of the Anglo-Norman houre and Middle English ure, first attested in the 13th century.
It displaced the Old English "tide" and "stound". The Anglo-Norman term was a borrowing of Old French ure, a variant of ore, which derived from Latin hōra and Greek hṓrā. Like Old English tīd and stund, hṓrā was a vaguer word for any span of time, including seasons and years, its Proto-Indo-European root has been reconstructed as *yeh₁-, making hour distantly cognate with year. The time of day is expressed in English in terms of hours. Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of clock. Hours on a 24-hour clock are expressed as "hundred" or "hundred hours". Fifteen and thirty minutes past the hour is expressed as "a quarter past" or "after" and "half past" from their fraction of the hour. Fifteen minutes before the hour may be expressed as "a quarter to", "of", "till", or "before" the hour; the ancient Egyptians began dividing the night into wnwt at some time before the compilation of the Dynasty V Pyramid Texts in the 24th century BC. By 2150 BC, diagrams of stars inside Egyptian coffin lids—variously known as "diagonal calendars" or "star clocks"—attest that there were 12 of these.
Clagett writes that it is "certain" this duodecimal division of the night followed the adoption of the Egyptian civil calendar placed c. 2800 BC on the basis of analyses of the Sothic cycle, but a lunar calendar long predated this and would have had twelve months in each of its years. The coffin diagrams show that the Egyptians took note of the heliacal risings of 36 stars or constellations, one for each of the ten-day "weeks" of their civil calendar; each night, the rising of eleven of these decans were noted, separating the night into twelve divisions whose middle terms would have lasted about 40 minutes each. The original decans used by the Egyptians would have fallen noticeably out of their proper places over a span of several centuries. By the time of Amenhotep III, the priests at Karnak were using water clocks to determine the hours; these were filled to the brim at sunset and the hour determined by comparing the water level against one of its twelve gauges, one for each month of the year.
During the New Kingdom, another system of decans was used, made up of 24 stars over the course of the year and 12 within any one night. The division of the day into 12 hours was accomplished by sundials marked with ten equal divisions; the morning and evening periods when the sundials failed to note time were observed as the first and last hours. The Egyptian hours were connected both with the priesthood of the gods and with their divine services. By the New Kingdom, each hour was conceived as a specific region of the sky or underworld through which Ra's solar barge travelled. Protective deities were used as the names of the hours; as the protectors and resurrectors of the sun, the goddesses of the night hours were considered to hold power over all lifespans and thus became part of Egyptian funerary rituals. Two fire-spitting cobras were said to guard the gates of each hour of the underworld, Wadjet and the rearing cobra were sometimes referenced as wnwt from their role protecting the dead through these gates.
The Egyptian for astronomer, used as a synonym for priest, was wnwty, "One of the Hours" or "Hour-Watcher". The earliest forms of wnwt include one or three stars, with the solar hours including the determinative hieroglyph for "sun". Ancient China divided its day into 100 "marks" running from midnight to midnight; the system is said to have been used since remote antiquity, credited to the legendary Yellow Emperor, but is first attested in Han-era water clocks and in the 2nd-century history of that dynasty. It was measured with sundials and water clocks. Into the Eastern Han, the Chinese measured their day schematically, adding the 20-ke difference between the solstices evenly throughout the year, one every nine days. During the night, time was more commonly