Gerard P. Kuiper

Gerard Peter Kuiper ("KYE per"), born Gerrit Pieter Kuiper ("KOW per") (December 7, 1905 – December 23, 1973) was a Dutch-American astronomer. Born and educated in the Netherlands, he came to the United States in 1933 and became a naturalized citizen in 1937. Kuiper discovered two moons of planets in the solar system, namely Uranus's moon Miranda and Neptune's moon Nereid. In addition, he discovered the existence of a methane-laced atmosphere above Saturn's moon Titan in 1944. He also suggested the existence of a belt outside Neptune's orbit, now named the Kuiper belt, whose existence is confirmed (see Trans-Neptunian objects). Kuiper also pioneered airborne infrared observing using a Convair 990 aircraft in the 1960s. Kuiper was a professor at the University of Arizona. In 1959, Kuiper won the Henry Norris Russell Lectureship of the American Astronomical Society. In the 1960s, Kuiper helped identify landing sites on the moon for the Apollo program. Asteroid 1776 Kuiper and Kuiper crater on the Moon as well as craters on Mars and Mercury are named after him. The now-decommissioned Kuiper Airborne Observatory was also named after him.

External link

- [http://quest.arc.nasa.gov/lfs/kuiper-bio.html Gerard Peter Kuiper: NASA KAO's Namesake] Kuiper, Gerard Kuiper, Gerard Kuiper, Gerard Kuiper, Gerard Kuiper, Gerard Category:University of Arizona ms:Gerard Kuiper

December 7

December 7 is the 341st day (342nd in leap years) of the year in the Gregorian calendar. There are 24 days remaining.

Events

- 1732 - The Royal Opera House opens at Covent Garden, London.
- 1776 - Marquis de Lafayette attempts to enter the American military as a major general.
- 1787 - Delaware becomes the first state to ratify the United States Constitution.
- 1815 - Michel Ney, Marshal of France, is executed by firing squad, after having been convicted of treason for his support of Napoleon Bonaparte.
- 1917 - World War I: The United States declares war on Austria-Hungary.
- 1941 - World War II: Attack On Pearl Harbor - The Imperial Japanese Navy attacks the U.S. Pacific Fleet and its defending Army Air Corps and Marine air forces at Pearl Harbor, Hawaii.
- 1946 - A fire at the Winecoff Hotel in Atlanta, Georgia kills 119 people.
- 1949 - Chinese Civil War: The government of the Republic of China moves from Nanking to Taipei.
- 1962 - Prince Rainier III of Monaco revises the principality's constitution, devolving some of his power to advisory and legislative councils.
- 1965 - Pope Paul VI and Patriarch Athenagoras simultaneously lift mutual excommunications that had been in place since 1054.
- 1966 - A fire at an army barracks in Erzurum, Turkey kills 68 people.
- 1970 - The first ever general election on the basis of direct adult franchise are held in Pakistan for 313 National Assembly seats.
- 1971 - Pakistan President Yahya Khan announces formation of a Coalition Government at Centre with Nurul Amin as Prime Minister and Zulfiqar Ali Bhutto as Vice-Prime Minister.
- 1972 - Apollo 17, the last Apollo moon mission, is launched. The crew take the photograph known as "The Blue Marble" as they leave the Earth.
- 1975 - Indonesia invades East Timor.
- 1982 - In Texas, Charles Brooks, Jr. becomes the first person to be executed by lethal injection in the United States.
- 1983 - Two jetliners collide at Madrid Barajas International Airport, Madrid killing 93 people.
- 1987 - PSA Flight 1771 crashes near Paso Robles, California, killing all 43 on board, after a disgruntled passenger shoots his ex-boss on the flight, then shoots both pilots and himself.
- 1988 - Spitak Earthquake: In Armenia an earthquake measuring 6.9 on the Richter scale kills nearly 25,000, injures 15,000 and leaves 400,000 homeless.
- 1988 - Yasser Arafat recognizes the right of Israel to exist.
- 1989 - In their third and final fight, Sugar Ray Leonard retains the WBC Super-Middleweight Championship of the World , defeating Roberto Duran.
- 1993 - In South Africa, the Transitional Executive Council is established.
- 1995 - The Galileo spacecraft arrives at Jupiter, a little more than six years after it was launched by Space Shuttle Atlantis during Mission STS-34.
- 2003 - The Conservative Party of Canada is officially recognized after the merger of the Canadian Alliance and Progressive Conservative Party of Canada.
- 2004 - Hamid Karzai is inaugurated as President of Afghanistan.
- 2004 - John Kufuor is re-elected as President of Ghana.
- 2005 - Rigoberto Alpizar, a passenger on American Airlines Flight 924 who allegedly claimed to have a bomb, is shot and killed by a team of U.S. federal air marshals at Miami International Airport.

Births

- 521 - Saint Columba, Irish Christian missionary to Scotland (d. 597)
- 1545 - Henry Stuart, Lord Darnley, consort of Mary I of Scotland (d. 1567)
- 1561 - Kikkawa Hiroie, Japanese politician (d. 1625)
- 1598 - Gian Lorenzo Bernini, Italian artist (d. 1680)
- 1637 - Bernardo Pasquini, Italian composer (d. 1710)
- 1670 - John Aislabie, English director of the South Sea Company (d. 1742)
- 1761 - Marie Tussaud, French-born museum proprietress and waxwork modeller (d. 1850)
- 1764 - Claude Victor-Perrin, duc de Belluno, French marshal (d. 1841)
- 1784 - Allan Cunningham, British poet (d. 1842)
- 1801 - Johann Nestroy, Austrian dramatist and actor (d. 1862)
- 1810 - Theodor Schwann, German physiologist (d. 1882)
- 1810 - Josef Hyrtl, Austrian anatomist (d. 1894)
- 1823 - Leopold Kronecker, German mathematician (d. 1891)
- 1847 - George Grossmith, British actor and comic writer (d. 1912)
- 1860 - Sir Joseph Cook, sixth Prime Minister of Australia (d. 1947)
- 1863 - Pietro Mascagni, Italian composer (d. 1945)
- 1863 - Richard Sears, American department store founder (d. 1914)
- 1873 - Willa Cather, American novelist (d. 1947)
- 1879 - Rudolf Friml, American composer (d. 1972)
- 1887 - Ernst Toch, Austrian composer (d. 1964)
- 1888 - Joyce Cary, Irish author (d. 1957)
- 1888 - Hamilton Fish, American politician (d. 1991)
- 1903 - Danilo Blanuša, Croatian mathematician (d. 1987)
- 1904 - Konstantin Sokolsky, Russian singer
- 1905 - Gerard Kuiper, Dutch-born American astronomer (d. 1973)
- 1910 - Louis Prima, American musician (d. 1978)
- 1912 - Daniel Jones, British composer (d. 1993)
- 1915 - Eli Wallach, American actor
- 1922 - Howard Zinn, American historian and activist
- 1924 - Mário Soares, President of Portugal
- 1927 - Helen Watts, British contralto
- 1928 - Noam Chomsky, American linguist and political writer
- 1932 - Ellen Burstyn, American actress
- 1942 - Harry Chapin, American singer and songwriter (d. 1981)
- 1942 - Peter Tomarken, American game show host
- 1943 - Bernard C. Parks, former Chief of the Los Angeles Police Department.
- 1944 - Daniel Chorzempa, American organist
- 1945 - Marion Rung, Finnish singer
- 1947 - Johnny Bench, American baseball player
- 1948 - Gary Morris, American singer and actor
- 1948 - Mads Vinding, Danish bassist
- 1949 - Tom Waits, American singer, composer, and actor
- 1954 - Mark Hofmann, American forger and bomber
- 1956 - Larry Bird, American basketball player and Olympic gold medalist
- 1958 - Tim Butler, British bassist (Psychedelic Furs)
- 1966 - C. Thomas Howell, American actor
- 1967 - Tino Martinez, American baseball player
- 1971 - Vladimir Akopian, Soviet-born Armenian chess player
- 1971 - Chasey Lain, American adult film actress
- 1972 - Hermann Maier, Austrian skier, Alpine Skiing World Cup winner and Olympic gold medalist
- 1972 - Tammy Lynn Sytch, American professional wrestler
- 1973 - Terrell Owens, American football player
- 1974 - Nicole Appleton, Canadian-born singer
- 1975 - Jamie Clapham, British footballer
- 1980 - John Terry, English international footballer
- 1987 - Aaron Carter, American singer
- 1988 - Emily Browning, Australian actress
- 2003 - Princess Catharina-Amalia of the Netherlands

Deaths

- 43 BC - Cicero, Roman politician and author (b. 106 BC)
- 283 - Pope Eutychian
- 1254 - Pope Innocent IV
- 1279 - King Boleslaus V of Poland (b. 1226)
- 1295 - Gilbert de Clare, 7th Earl of Hertford, English politician (b. 1243)
- 1498 - Alexander Hegius von Heek, German humanist
- 1562 - Adrian Willaert, Flemish composer
- 1632 - Emperor Sissinios of Ethiopia (b. 1607)
- 1649 - Charles Garnier, French Jesuit missionary (b. 1606)
- 1672 - Richard Bellingham, English-born Massachusetts colonial magistrate (b. 1592)
- 1683 - John Oldham, English poet (smallpox) (b. 1653)
- 1683 - Algernon Sydney, English politician (b. 1623)
- 1723 - Jan Santini Aichel, Bohemian architect (b. 1677)
- 1725 - Florent Carton Dancourt, French dramatist and actor (b. 1661)
- 1775 - Charles Saunders, Ontario-born British admiral
- 1793 - Joseph Bara, French revolutionary (b. 1780)
- 1815 - Michel Ney, French marshall (executed) (b. 1769)
- 1817 - William Bligh, British naval officer (b. 1745)
- 1874 - Constantin von Tischendorf, German biblical scholar (b. 1815)
- 1902 - Thomas Nast, German cartoonist (b. 1840)
- 1906 - Élie Ducommun, Swiss journalist and Nobel Prize laureate (b. 1833)
- 1941 - Isaac C. Kidd, American rear admiral (b. 1884)
- 1943 - Per Imerslund, Norwegian "det ariske idol" (The aryan idol) (b. 1912)
- 1947 - Nicholas M. Butler, American president of Columbia University and Nobel Prize laureate (b. 1862)
- 1956 - Huntley Gordon, Canadian actor (b. 1887)
- 1970 - Rube Goldberg, American cartoonist (b. 1883)
- 1975 - Thornton Wilder, American playwright (b. 1897)
- 1978 - Alexander Wetmore, American ornithologist (b. 1886)
- 1985 - Robert Graves, British author (b. 1895)
- 1985 - Potter Stewart, U.S. Supreme Court Justice (b. 1915)
- 1990 - Joan Bennett, American actress (b. 1910)
- 1993 - Félix Houphouët-Boigny, President of Côte d'Ivoire (b. 1905)
- 1993 - Wolfgang Paul, German physicist and Nobel Prize laureate (b. 1913)
- 1998 - Martin Rodbell, American scientist and Nobel Prize laureate (b. 1925)
- 2003 - Carl F. H. Henry American theologian and publisher (b. 1913)
- 2003 - Azie Taylor Morton, Treasurer of the United States (b. 1936)
- 2003 - Raúl Vale, Venezuelan entertainer (b. 1944)
- 2004 - Frederick Fennell, American conductor (b. 1914)
- 2004 - Jerry Scoggins, American singer (b. 1913)
- 2005 - Devan Nair, 3rd President of Singapore (b. 1923)
- 2005 - Bud Carson, American football player/coach (b. 1931)

Holidays and observances

- R.C. Saints - Saint Ambrose: Memorial
- Also see December 7 (Eastern Orthodox liturgics)
- United States - Pearl Harbor Day (observance)
- International Civil Aviation Day

External links

- [http://news.bbc.co.uk/onthisday/hi/dates/stories/december/7 BBC: On This Day] ---- December 6 - December 8 - November 7 - January 7 -- listing of all days ko:12월 7일 ms:7 Disember ja:12月7日 simple:December 7 th:7 ธันวาคม

December 23

December 23 is the 357th day of the year in the Gregorian Calendar (358th in leap years). There are 8 days remaining.

Events

- 619 - Boniface V becomes Pope
- 1493 - The Latin edition of the Nuremberg Chronicle is published
- 1620 - Construction of Plymouth Colony begins
- 1783 - George Washington resigns as commander-in-chief of the Continental Army at Annapolis, Maryland.
- 1823 - A Visit From St. Nicholas, attributed to Clement Clarke Moore, is first published
- 1888 - Vincent Van Gogh cut off his ear.
- 1909 - Albert I of Belgium becomes King.
- 1913 - The Federal Reserve Act becomes law.
- 1916 - World War I: In the Battle of Magdhaba, Allied forces capture a Turkish garrison on the Sinai peninsula.
- 1936 - Colombia becomes a signatory to the Buenos Aires copyright treaty.
- 1947 - The transistor is first demonstrated at Bell Laboratories
- 1954 - The first human organ transplant, of a kidney, was performed by Doctors Murray and Harrison at Peter Bent Brigham Hospital in Boston.
- 1964 - Beach Boys' bassist/keyboardist Brian Wilson suffers a nervous breakdown on a flight from Los Angeles to Houston, eventually precipitating his retirement.
- 1972 - The Nicaragua capital city, Managua was struck by a 6.5 magnitude earthquake.
- 1972 - Terry Bradshaw throws the Immaculate Reception pass "to" Franco Harris.
- 1972 - The survivors of the Andes flight disaster are rescued after 73 days.
- 1973 - A Sobelair Caravelle passenger jet crashes in Morocco, killing 106
- 1979 - Soviet invasion of Afghanistan: Soviet military units occupy Kabul, the capital of Afghanistan
- 1982 - The Environmental Protection Agency recommends the evacuation of Times Beach, Missouri due to dangerous levels of dioxin contamination
- 1986 - The Scaled Composites Voyager aircraft completes the first non-stop flight around the world without refueling.
- 1990 - Republic of Slovenia votes to secede from Socialist Federal Republic of Yugoslavia
- 2004 - An earthquake measured 8.1 on the Richter scale hits Macquarie Island in the Southern Ocean, one day before the 2004 Indian Ocean Earthquake.

Births

- 1513 - Thomas Smith, English diplomat and scholar (d. 1577)
- 1537 - King John III of Sweden (d. 1592)
- 1582 - Severo Bonini, Italian composer (d. 1663)
- 1597 - Martin Opitz von Boberfeld, German poet (d. 1639)
- 1613 - Carl Gustaf Wrangel, Swedish soldier (d. 1676)
- 1621 - Edmund Berry Godfrey, English magistrate (d. 1678)
- 1621 - Heneage Finch, 1st Earl of Nottingham, Lord Chancellor of England (d. 1682)
- 1689 - Joseph Bodin de Boismortier, French composer (d. 1755)
- 1732 - Richard Arkwright, English industrialist and inventor (d. 1792)
- 1750 - King Frederick Augustus I of Saxony (d. 1827)
- 1777 - Tsar Alexander I of Russia (d. 1825)
- 1790 - Jean François Champollion, French Egyptologist (d. 1832)
- 1804 - Charles Augustin Sainte-Beuve, French literary critic (d. 1869)
- 1805 - Joseph Smith, Jr., American founder of the Church of Jesus Christ of Latter-day Saints (d. 1844)
- 1819 - Jan Jakob Lodewijk ten Kate, Dutch poet and clergyman (d. 1889)
- 1822 - Wilhelm Bauer, German engineer (d. 1875)
- 1867 - Madame C. J. Walker, American millionaire (d. 1919)
- 1885 - Pierre Brissaud, French artist (d. 1964)
- 1891 - Alexandr Rodchenko, Russian painter and photographer (d. 1956)
- 1907 - Avraham Stern, Polish-born Zionist leader (d. 1942)
- 1908 - Yousuf Karsh, Turkish-born photographer (d. 2002)
- 1911 - Niels Kaj Jerne, English-born immunologist, recipient of the Nobel Prize in Physiology or Medicine (d. 1994)
- 1918 - Helmut Schmidt, Chancellor of Germany
- 1918 - José Greco, Italian-born flamenco dancer (d. 2001)
- 1922 - Micheline Ostermeyer, French athlete and musician
- 1923 - Günther Schifter, Austrian music journalist
- 1923 - Claudio Scimone, Italian conductor
- 1923 - James Stockdale, U.S. Navy admiral
- 1926 - Robert Bly, American poet
- 1931 - Ronnie Schell, American actor
- 1933 - Akihito, Emperor of Japan
- 1935 - Paul Hornung, American football player
- 1936 - Frederic Forrest, American actor
- 1940 - Jorma Kaukonen, American musician
- 1941 - Tim Hardin, American musician (d. 1980)
- 1943 - Mikhail Gromov, Russian-born mathematician
- 1943 - Harry Shearer, American actor
- 1943 - Silvia Sommerlath, Queen of Sweden
- 1944 - Wesley Clark, U.S. general and NATO Supreme Allied Commander
- 1947 - Susan Lucci, American actress
- 1948 - Jack Ham, American football player
- 1949 - Adrian Belew, Guitarist, Singer, Songwriter, Producer
- 1950 - Michael C. Burgess, American politician
- 1952 - William Kristol, American political commentator
- 1956 - Dave Murray, English musician (Iron Maiden)
- 1958 - Victoria Williams, American singer
- 1961 - Carol Smillie, British television personality
- 1963 - Jim Harbaugh, American football player
- 1964 - Eddie Vedder, American musician (Pearl Jam)
- 1969 - Martha Byrne, American actress
- 1970 - Catriona LeMay Doan, Canadian speed skater
- 1971 - Corey Haim, Canadian actor
- 1971 - Tara Palmer-Tomkinson, British socialite
- 1975 - Sky Lopez, American actress
- 1977 - Alge Crumpler, American football player
- 1978 - Andra Davis, American football player
- 1978 - Esthero, Canadian musician and singer
- 1978 - Víctor Martínez, Venezuelan Major League Baseball player
- 1978 - Estella Warren, Canadian model and actress
- 1981 - Beth, Spanish singer

Deaths

- 910 - Naum of Preslav, Bulgarian scholar
- 913 - Conrad of Franconia
- 1230 - Berengaria of Navarre, queen of Richard I of England
- 1556 - Nicholas Udall, English playwright (b. 1504)
- 1568 - Roger Ascham, tutor of Elizabeth I of England
- 1575 - Akiyama Nobutomo, Japanese warrior (b. 1531)
- 1588 - Henry I, Duke of Guise, French Catholic leader (b. 1550)
- 1631 - Michael Drayton, English poet (b. 1563)
- 1646 - François Maynard, French poet (b. 1582)
- 1652 - John Cotton, founder of Boston, Massachusetts (b. 1585)
- 1675 - Caesar, duc de Choiseul, French marshal and diplomat (b. 1602)
- 1722 - Pierre Varignon, French mathematician (b. 1654)
- 1771 - Marie-Marguerite d'Youville, Canadian saint (b. 1701)
- 1761 - Alestair Ruadh MacDonnell, Scottish Jacobite spy
- 1779 - Augustus Hervey, 3rd Earl of Bristol, British admiral and politician (b. 1724)
- 1789 - Charles-Michel de l'Épée, French philanthropist and developer of signed French (b. 1712)
- 1793 - Johann Adolph Hasse, German composer (b. 1699)
- 1795 - Henry Clinton, British general (b. 1730)
- 1805 - Pehr Osbeck, Swedish explorer and naturalist (b. 1723)
- 1834 - Thomas Malthus, English demographer and economist (b. 1766)
- 1846 - Jean Baptiste Bory de Saint-Vincent, French naturalist (b. 1780)
- 1872 - Theophile Gautier, French writer (b. 1811)
- 1912 - Otto Schoetensack, German anthropologist (b. 1850)
- 1939 - Anthony Fokker, Dutch aircraft manufacturer (b. 1890)
- 1948 - Hideki Tojo, Prime Minister of Japan (hanged) (b. 1884)
- 1953 - Lavrenty Beria, Soviet Communist leader (b. 1899)
- 1970 - Charles Ruggles, American actor (b. 1886)
- 1973 - Charles Atlas, Italian-born bodybuilder (b. 1892)
- 1973 - Irna Phillips, American television writer, director, and producer (b. 1901)
- 1979 - Peggy Guggenheim, American art collector (b. 1898)
- 1982 - Jack Webb, American actor, producer, and director (b. 1920)
- 1992 - Eddie Hazel, American guitarist (Funkadelic) (b. 1950)
- 1994 - Sebastian Shaw, English actor (b. 1905)
- 2000 - Billy Barty, American actor (b. 1924)
- 2000 - Victor Borge, Danish-born comedian and pianist (b. 1909)
- 2004 - P. V. Narasimha Rao, ninth Prime Minister of India (b. 1921)

Holidays and observances

- Japan - The Emperor's Birthday - Birthday of Akihito, the current Emperor of Japan
- Sweden - Birthday of Queen Silvia, an official flag day
- Oaxaca - Night of the Radishes
- Roman Empire - Larentalia, a festival in honor of Larenta
- Ancient Latvia - Ziemassvetki held
- Fans of Seinfeld - Festivus held
- Secular humanism (American) - HumanLight observed

External links

- [http://news.bbc.co.uk/onthisday/hi/dates/stories/december/23 BBC: On This Day]
- [http://www.tnl.net/when/12/23 Today in History: December 23] ---- December 22 - December 24 - November 23 - January 23 -- listing of all days ko:12월 23일 ms:23 Disember ja:12月23日 simple:December 23 th:23 ธันวาคม

Netherlands

The Netherlands (Dutch: Nederland; IPA pronunciation: /"ne:dərlant/) is the European part of the Kingdom of the Netherlands that is formed by the Netherlands, the Netherlands Antilles and Aruba. (Dutch: Koninkrijk der Nederlanden). The Netherlands is a parliamentary democracy under a constitutional monarch, located in northwestern Europe. It borders the North Sea to the north and west, Belgium to the south, and Germany to the east. In many countries, the Netherlands is often referred to by the name Holland, and even within the Netherlands itself this name is occasionally used as an acceptable translation of the country's name. However widespread, this usage is technically incorrect, as "Holland" is actually a region in the central-western part of the Netherlands, divided into two provinces. Also, the English plural form 'the Netherlands' is a remnant from times when the country was not yet independent and united. See below under 'naming conventions'. The Netherlands is one of the most densely populated and geographically low-lying countries in the world (its name literally means "low country") and is famous for its dikes, windmills, wooden shoes, tulips, bicycles and social tolerance. Its liberal policies (towards drugs and prostitution among other things) receive international attention. The country is host to the International Court of Justice. The English adjective and noun for "of or relating to the Netherlands" is "Dutch," which is also the name of the Dutch language. In the Netherlands, "Netherlands" is sometimes used as an adjective. The origin of this local usage may be that the Dutch word for "Dutch" is Nederlands and to avoid confusion with the words "Duits" (in Dutch) and "Deutsch" (in German) that refer to the country Germany and its language.

Capital

Amsterdam is the hoofdstad ("capital city"), where according to the constitution, the sovereign must be sworn in. The Hague is the Netherlands regeringszetel or residentie (seat of government, residence of the monarch). It is the seat of government, the home of the monarch, and the location of most foreign embassies.

History

:For more details on this topic, see History of the Netherlands and Dutch monarchy. Under Charles V, Holy Roman Emperor and king of Spain, the region was part of the Seventeen Provinces of the Netherlands, which also includes most of present-day Belgium, Luxembourg, and some land of France and Germany. In 1568 the Eighty Years' War started after the entire population had been condemned to death by the Holy See and confirmed by the king, and in 1579, the northern half of the Seventeen Provinces declared itself independent and formed the Union of Utrecht, which is seen as the foundation of the modern Netherlands. Philip II, the son of Charles V, was not prepared to let them go that easily. It would not be until 1648 that Spain would recognize Dutch independence. After gaining formal independence from the Spanish Empire under King Philip IV, the Dutch grew to become one of the major seafaring and economic powers of the 17th century during the period of the Republic of the Seven United Netherlands. In the era, referred to as the Dutch Golden Age, colonies and trading posts were established all over the globe. (See Dutch colonial empire) Many economic historians regard the Netherlands as the first thoroughly capitalist country in the world. In early modern Europe it featured the wealthiest trading city (Amsterdam) and the first full-time stock exchange. The inventiveness of the traders led to insurance and retirement funds as well as such less benign phenomena as the boom-bust cycle, the world's first asset-inflation bubble, the tulip mania of 1636-1637, and according to Murray Sayle, the world's first bear raider - Isaac le Maire, who forced prices down by dumping stock and then buying it back at a discount ("Japan Goes Dutch", London Review of Books [April 5, 2001]: 3-7). After briefly being incorporated in the First French Empire under Napoleon, the Kingdom of the Netherlands was formed in 1815, consisting of the present day Netherlands, Belgium and Luxembourg. In addition, the king of the Netherlands became hereditary Grand Duke of Luxembourg. Belgium rebelled and gained independence in 1830, while the personal union between Luxembourg and the Netherlands was severed in 1890 as a result of ascendancy laws which prevented Queen Wilhelmina from becoming Grand Duke. The Netherlands possessed several colonies, most notably the Dutch East Indies (now Indonesia) and Suriname (the latter was traded with the British for New Amsterdam, now known as New York). These 'colonies' were first administered by the Dutch East India Company and the Dutch West India Company, both collective private enterprises. Three centuries later these companies got into financial trouble and the territories in which they operated were taken over by the Dutch government (in 1815 and 1791 respectively). Only then did they become official colonies. During the 19th century, The Netherlands was slow to industrialize compared to neighboring countries, mainly due to its unique infrastructure of waterways and reliance on wind power. After remaining neutral in World War I, over 100,000 Dutch Jews were murdered in the Holocaust of World War II, along with significant numbers of Dutch Roma (gypsies). After the war, the Dutch economy prospered again, being a member of the Benelux (Belgium, the Netherlands and Luxembourg) and European Economic Community unions. The Netherlands was among the twelve founding members of the North Atlantic Treaty Organisation (NATO) and among the six founding members of the European Coal and Steel Community, which would later evolve into the European Union.

Naming conventions

The name Holland is often used, incorrectly, for The Netherlands, especially in other languages. The origin of the misnomer lies in the fact that the region of Holland was the economic powerhouse during the time of the United Provinces (1581-1795). After the Napoleonic era, Holland became a mere province of the Kingdom and was split into North and South Holland in 1840. Many people, especially from the northern and southern provinces, object to the use of the name Holland for The Netherlands. But to avoid confusion when addressing other nationals, the Dutch themselves often use the name 'Holland'. The plural "Netherlands" is actually an archaic term, referring to the time when it was a collection of regions that were not yet fully united. In The Netherlands itself the country is called Nederland (literally meaning "low country"), the people are called Nederlanders ("Dutch" in English) and the language is called Nederlands (again, "Dutch" in English); the -s in Nederlands is not a plural ending, but rather is cognate to the English suffix -ish. The English word "Dutch" is akin to the German word Deutsch, which originally meant "(Language) of the (common) people" in contrast with the medieval elite who spoke Latin. An old term for the language of The Netherlands is Diets or Nederdietsch. All these terms derive from what in Latin was known as Theodisca, from Germanic
- Þeudiskaz.

Politics

The Netherlands has been a parliamentary democracy since 1848 and a constitutional monarchy since 1815; before that it had been a republic from 1581 to 1806 (it was occupied by France between 1806 and 1815). The pro forma head of state, since 1980, is Queen Beatrix of the House of Orange-Nassau. The Dutch monarch has little political power, but serves mostly as a ceremonial figurehead to represent the nation. Dutch governments always consist of a coalition, as there is not (and has never been) a single political party large enough to get the majority vote. Formally, the queen appoints the members of the government. In practice, once the results of parliamentary elections are known, a coalition government is formed (in a process of negotiations that can take several months), after which the government formed in this way is officially appointed by the queen. The head of the government is the Prime Minister, in Dutch Minister President or Premier, a primus inter pares who is usually also the leader of the largest party in the coalition. The degree of influence the queen has on actual government decision making is a topic of ongoing speculation. The parliament consists of two houses. The 150 members of the Lower House (Tweede Kamer, or Second Chamber) are elected every four years in direct elections. The provincial parliaments are directly elected every 4 years as well. The members of the provincial parliaments vote (indirectly) for the less important Senate (Eerste Kamer, or First Chamber). Together, the First and Second Chamber are known as the Staten Generaal, the States General. Political scientists consider The Netherlands a classic example of a consociational state, at least in part caused by the necessity in the Netherlands since the middle ages for different cities to cooperate in order to fight the water (different cities were at the time like different countries by today's standards, and often at war). This necessity to reach an agreement despite differences is called the polder model in Dutch. Also, the Netherlands has long been a nation of traders and for international trade one has to be tolerant of the other person's culture. The Netherlands is a neutral country in most international affairs and thus managed to keep out of World War I (although this did not work in World War II). As a result, the Dutch have a 'friendly' reputation in other countries, to the point that bearers of a Dutch passport often have relatively little difficulty getting into other countries, for visits or even for emigration purposes. However, the early years of the 21st century have seen a political change with the right wing in politics gaining on the left. This is illustrated by the quick rise (and fall) of the LPF. Pim Fortuyn, its founder, held former cabinets responsible for the failing integration of immigrants. The present government is led by the cabinet Balkenende II. This cabinet got some critique about economic reforms and the immigration policies. On June 1 2005 the Dutch electorate voted in a referendum against the proposed EU Constitution by a majority of 61.6%, three days after the French had also voted against. See also: Prime Minister of the Netherlands, List of Prime Ministers of the Netherlands

Provinces

List of Prime Ministers of the Netherlands The Netherlands is divided into twelve administrative regions, called provinces, each under a Governor, who is called Commissaris van de Koningin (Commissionair of the Queen).
- Friesland - north west; capital Leeuwarden
- Groningen - north east; capital Groningen
- Drenthe - south of Groningen; capital Assen
- Overijssel - east central, south of Drenthe; capital Zwolle
- Flevoland - central, north of Utrecht; capital Lelystad
- Gelderland - east central, south of Overijssel; capital Arnhem
- Utrecht - central; capital Utrecht
- North Holland - (Noord-Holland) north west (including Amsterdam); capital Haarlem
- South Holland - (Zuid-Holland) west central, south of North Holland (including Rotterdam); capital The Hague (s-Gravenhage or Den Haag)
- Zeeland - south west; capital Middelburg
- North Brabant - (Noord-Brabant) south central; capital 's-Hertogenbosch (or Den Bosch)
- Limburg - south east; capital Maastricht. All provinces are divided into municipalities (gemeenten), together 467; see Municipalities in the Netherlands, and also List of cities in the Netherlands by province. The country is also subdivided in water districts, governed by a water board (waterschap or hoogheemraadschap), each having authority in matters concerning water management. As of 1 January 2005 there are twenty seven. The creation of water boards actually pre-dates that of the nation itself, the first appearing in 1196. In fact, the Dutch water boards are one of the oldest democratic entities in the world still in existence. See also: Ranked list of Dutch provinces.
Geography
Ranked list of Dutch provinces Ranked list of Dutch provinces A remarkable aspect of the Netherlands is the flatness of the country. About half of its surface area is less than 1 m above sea level, and large parts of it are actually below sea level (see [http://www.minbuza.nl/default.asp?CMS_ITEM=MBZ302750 map showing these areas]). An extensive range of dikes and dunes protect these areas from flooding. Numerous massive pumping stations keep the ground water level in check. The highest point, the Vaalserberg, in the south-eastern most point of the country, is 321 m above sea level. A substantial part of the Netherlands, for example, all of Flevoland and large parts of Holland, has been reclaimed from the sea. These areas are known as polders. This has led to the saying "God created the world, but the Dutch created the Netherlands." In years past, the Dutch coastline has changed considerably due to human intervention and natural disasters. Most notable in terms of land loss are the 1134 storm, which created the archipelago of Zeeland in the south west, and the 1287 storm, which killed 50,000 people and created the Zuyderzee (now dammed in and renamed the IJsselmeer - see below) in the northwest, giving Amsterdam direct access to the sea. The St. Elizabeth flood of 1421 and the mismanagement in its aftermath destroyed a newly reclaimed polder, replacing it with the 72 km² Biesbosch tidal floodplains in the southcentre. The most recent parts of Zeeland were flooded during the North Sea Flood of 1953 and 1,836 people were killed, after which the Delta Plan was executed. The disasters were partially man-made; the people drained relatively high lying swampland for use as farmland. This drainage caused the fertile peat to compress and the ground level to drop, locking the land users in a vicious circle whereby they would lower the water level to compensate for the drop in ground level, causing the underlying peat to compress even more. The vicious circle is unsolvable and remains to this day. Up until the 19th century peat was dug up, dried, and used for fuel, further adding to the problem. To guard against floods, a series of defences against the water were contrived. In the first millennium, villages and farmhouses were built on man-made hills called terps. Later these terps were connected by dikes. In the 12th century, local government agencies called "waterschappen" (English "waterbodies") or "hoogheemraadschappen" ("high home councils") started to appear, whose job it was to maintain the water level and to protect a region from floods. (The waterbodies are still around today performing the exact same function.) As the ground level dropped, the dikes by necessity grew and merged into an integrated system. In the 13th century, windmills came into use to pump water out of the areas by now below sea level. The windmills were later used to drain lakes, creating the famous polders. In 1932, the Afsluitdijk (English "Closure Dike") was completed, blocking the former Zuyderzee (Southern Sea) off from the North Sea and thus creating the IJsselmeer (IJssel Lake). It became part of the larger Zuiderzee Works in which four polders totalling 1,650 km² were reclaimed from the sea. After the 1953 disaster, the Delta project, a vast construction effort designed to end the threat from the sea once and for all, was launched in 1958 and largely completed in 2002. The official goal of the Delta project was to reduce the risk of flooding in Holland to once per 10,000 years. (For the rest of the country, the protection-level is once per 4,000 years). This was achieved by raising 3,000 km of outer sea-dikes and 10,000 km of inner, canal, and river dikes to "delta" height, and by closing off the sea estuaries of the Zeeland province. New risk assessments occasionally incur additional Delta project work in the form of dike re-enforcements. The Delta project is the single largest construction effort in human history and is considered by the American Society of Civil Engineers as one of the seven wonders of the modern world. Because of the high cost of maintaining the polders some have argued that maybe some of the deepest polders should be given up. Additionally, the Netherlands is one of the countries that may suffer most from climatic change. Not only is the rising sea a problem, but also erratic weather patterns may cause the rivers to overflow. These flooded polders might then be used as water catchments to take part of the blow. The country is divided into two main parts by three rivers Rhine (Rijn), Waal, and Meuse (Maas). The south western part of the Netherlands is actually one big river delta of these rivers. These rivers not only function as a natural barrier, but also as a cultural divide, as is evident in the different dialects spoken north and south of these great rivers and the (previous) religious dominance of Catholics in the south and Calvinists in the north. The predominant wind direction in the Netherlands is south west, which causes a moderate maritime climate, with cool summers and mild winters. See also: National parks (Netherlands).
Economy
The Netherlands has a prosperous and open economy in which the government has reduced its role since the 1980s. Industrial activity is predominantly in food-processing (for example Unilever and Heineken), chemicals (for example DSM), petroleum refining (for example Royal Dutch Shell), and electrical machinery (for example Philips). A highly mechanised agricultural sector employs no more than 4% of the labour force but provides large surpluses for the food-processing industry and for exports. The Dutch rank third worldwide in value of agricultural exports, behind the US and France. Other important parts of the economy are international trade (Dutch colonialism started with cooperative private enterprises such as the VOC), banking and transport (for example the Rotterdam harbour). The Netherlands successfully addressed the issue of public finances and stagnating job growth long before its European partners. As a founding member of the Euro, the Netherlands replaced its former currency, the Gulden, on January 1 1999 along with the other adopters of the single European currency, with the actual Euro coins and banknotes following on January 1, 2002. However, in the first years of the third millennium, economic and employment growth came to a standstill, which the government tried to resolve by cutting into its expenses. In 2003 the economy shrunk 0.9%. In 2004, the recession was over and the economy began its slow recovery with a meager 1.3% growth. The CPB ("Centraal Plan Bureau", Central Planning Bureau), a think tank of leading Dutch economists linked with the government, expects a recovery of the economy in 2005, with a growth of 2.25%. In 2004, inflation was 1.2%, the lowest level since 1989.
- Economic data for the Netherlands: [http://statline.cbs.nl Dutch] [http://statline.cbs.nl/StatWeb/start.asp?lp=Search/Search&LA=EN English]
- List of Dutch companies
Demographics
The Netherlands is the 15th most densely populated country in the world, with 393 inhabitants per square km (or 482/km² if only the land area is counted, 20% is water). Partly because of this it is also one of the most densely cabled countries in the world. Internet penetration [http://www.internetworldstats.com/top25.htm] is at 66.2% the 7th highest in the world. According CBS Statline, the official statistics bureau of the Netherlands, the ethnic origins of the citizens are very diverse. The vast majority of the population however still remains Dutch. They were: 80.8% Dutch, 8.7% other European, 2.2% Turkish, 1.9% Moroccan, 6.4% other There are no cities with a population over 1 million in the Netherlands, but the 'four big cities' as they are called (Amsterdam, Rotterdam, The Hague and Utrecht) can in many ways be regarded as one 'big city' agglomeration, the Randstad ('fringe city'), with an agricultural 'green heart' (het Groene Hart). This is illustrated by the idea to create a circular train network with a frequency and carriages similar to a metropolitan railway.
Languages
The official language is Dutch, which is spoken by practically all inhabitants. Another official language is Frisian, which is spoken in the northern province of Friesland and has a strong resemblance to English. Frisian is co-official only in the province of Friesland, although with a few restrictions. Several dialects of Plattdüütsch are spoken in much of the north and are recognised as regional languages, as protected by the European Charter for Regional or Minority Languages. To the south, the Dutch language shifts into other varieties of Low Franconian and German, which may or may not be best classified as Dutch, most notably West Flemish. One of these, Limburgish, which is spoken in the south-eastern province of Limburg has been recognised as a minority language since 1977.
Religion
According to the governmental statistics agency (CBS) 30% of the population consider themselves to be Roman Catholic, 20% Protestant (predominantly Dutch Reformed) and 8% 'other denominations'. 42% consider themselves not to belong to any religious denomination. Church attendance however is much lower than these figures may suggest: some 70% of the population 'rarely or never' visit a house of worship (be it a church, mosque, synagogue or temple). The most protestants live in the northern provinces while the southern provinces (Noord-Brabant and Limburg) are mainly Roman Catholic. The largest part of the 'other denominations', at 920,000, are Muslim immigrant workers mainly living in the bigger cities, mostly from Morocco and Turkey, and their offspring. The other denominations also include some 200,000 (1.3%) Hindu, mostly descendants of indentured servants who migrated from India to the former Dutch colony of Surinam around 1900. Prior to the Holocaust about 140,000 Jews lived in the Netherlands, however the vast majority of [http://www.worldjewishcongress.org/communities/weurope/comm_netherlands.html Dutch Jewry] was murdered in the Holocaust. About 30,000 Dutch Jews now live in The Netherlands.
Culture
The Netherlands has had many well-known painters. The 17th century, when the Dutch republic was prosperous, was the age of the "Dutch Masters" such as Rembrandt van Rijn, Johannes Vermeer, Jan Steen and many others. Famous Dutch painters of the 19th and 20th century are Vincent van Gogh and Piet Mondriaan. M. C. Escher is a well-known graphics artist. Willem de Kooning was born and trained in Rotterdam, although he is considered to have reached acclaim as an American artist. A (in)famous Dutch master art forger is Han van Meegeren. The Netherlands is the country of philosophers Erasmus of Rotterdam and Spinoza, and all of Descartes' major work was done there. Christiaan Huygens(1629-1695) is a famous astronomer and mathematician. He discovered Saturn's moon Titan and invented an accurate clock. In the Dutch Golden Age, literature flowered as well, with Joost van den Vondel and P. C. Hooft as the two most famous writers. In the 19th century, Multatuli wrote about the bad treatment of the natives in Dutch colonies. Important 20th century authors include Harry Mulisch, Jan Wolkers, Simon Vestdijk, Cees Nooteboom, Gerard van het Reve and Willem Frederik Hermans. The Diary of Anne Frank was also written in the Netherlands. See also: List of museums in The Netherlands, Sport in the Netherlands, Music of the Netherlands, List of Dutch people, Public holidays in the Netherlands Replicas of Dutch buildings can be found in Huis ten Bosch, Nagasaki, Japan. A similar Holland Village is being built in Shenyang, China. Windmills, tulips, wooden shoes, cheese and Delftware pottery are among the numerous items associated with the Netherlands. Dutch policies on recreational drugs, prostitution, same-sex marriage and euthanasia are among the most liberal in the world.
Miscellaneous topics

- City rights in the Netherlands
- Communications in the Netherlands
- Drug policy of the Netherlands
- Dutch colonial empire
- Dutch people
- Dutch-Belgian War
- Education in the Netherlands
- Euthanasia in the Netherlands
- Foreign relations of the Netherlands
- General Intelligence and Security Office (AIVD)
- Income tax in the Netherlands
- List of football clubs in the Netherlands
- Military of the Netherlands
- Netherlands and weapons of mass destruction
- New Netherland
- Nomenclature of Territorial Units for Statistics (NUTS) of the Netherlands
- Prostitution in the Netherlands
- Public holidays in the Netherlands
- Reporters Without Borders worldwide press freedom index 2004 — first place
- Same-sex marriage in the Netherlands
- Statistics Netherlands
- Telephone numbers in the Netherlands
- Television networks in the Netherlands
- Tourism in the Netherlands
- Transportation in the Netherlands
External links

-
- [http://www.statoids.com/unl.html Provinces of Netherlands]
- [http://www.amsterdam-netherlands.info/ Amsterdam / Netherlands info] - Information about the Netherlands, its provinces and Amsterdam.
- [http://www.haganum.nl Best School of The Netherlands- The Gymnasiun Haganum in the Hague]
- [http://www.cbs.nl/en-GB/menu/cijfers/default.htm CBS] - Key figures from the Dutch bureau of statistics
- [http://www.cia.gov/cia/publications/factbook/geos/nl.html CIA - The World Factbook -- Netherlands]
- Dutch news: [http://www.rnw.nl/ Radio Netherlands], [http://www.expatica.com/source/site_content_subchannel.asp?subchannel_id=1 Expatica]
- [http://www.colonialvoyage.com Dutch Portuguese Colonial History] Dutch Colonial History in Sri Lanka, Ceylon, Brazil, India, Malacca (Malaysia), Bengal, Formosa(Taiwan), South Africa, New York, Caribbean, Indonesia. Language Heritage. Maps, chronologies, bibliographies.
- [http://encarta.msn.com/encyclopedia_761572410/Netherlands.html Encarta entry on the Netherlands]
- [http://flagspot.net/flags/nl-index.html Flagspot.net - The Netherlands]- site about flags, but also with province maps showing municipalities, and some other info
- Foreign government info about the Netherlands and their relations with it:
[http://www.dfat.gov.au/geo/netherlands/index.html Australia] | [http://www.dfait-maeci.gc.ca/canadaeuropa/country_net-en.asp Canada] | [http://meaindia.nic.in/foreignrelation/netherland.htm India] | [http://www.esteri.it/eng/3_22_40_214.asp Italy] | [http://www.mfat.govt.nz/foreign/regions/europe/countrypapers/netherlands.html New Zealand] | [http://www.dfa.gov.za/foreign/bilateral/netherlands.html South Africa] | [http://www.fco.gov.uk/servlet/Front?pagename=OpenMarket/Xcelerate/ShowPage&c=Page&cid=1007029394365&a=KCountryProfile&aid=1019061813313 UK] | [http://www.state.gov/r/pa/ei/bgn/3204.htm US]
- [http://www.government.nl Government.nl] - official Dutch government web site
- [http://en.wikibooks.org/wiki/Dutch] Dutch for English speakers (from Wikibooks)
- [http://www.skyscrapercity.info/200.php?id=4&country=NL&limit=0 List of ca. 1500 tall buildings in the Netherlands]
- [http://www.nlplanet.com/ NL Planet] - English language resources, background information and free forums
- [http://overheid.nl/guest/sites/ Overheid.nl] - official Dutch government portal (includes official publications from 1995; older ones are only available in some libraries, on paper or microfiche)
- [http://www.sdu.nl/staatscourant/gemeentes/gemprovin.htm Province maps showing subdivision in municipalities, and linking each municipality to its basic data page]
- [http://www.koninklijkhuis.nl/english/index.jsp The Dutch Royal House]
- [http://www.world-gazetteer.com/wg.php?x=1104447749&men=gmap&lng=en&gln=xx&dat=32&geo=-160&srt=npan&col=aohdq Maps and data]
- [http://www.track.nl/ Track.nl] - An Internet search-engine that specialises in the Netherlands.
- [http://www.world66.com/europe/netherlands World66 Guide to The Netherlands] A travel guide written by its users.
- [http://www.deltaworks.org Deltaworks Online - Flood protection and watermanagement in the Netherlands] Category:European Union member states Category:Monarchies als:Niederlande zh-min-nan:Kē-tē-kok [[got:

Astronomy

:This article is about the science branch. For information about the magazine, see Astronomy (magazine). Astronomy (magazine) as they circled the Moon in 1969. Located near the center of the far side of Earth's Moon, its diameter is about 58 miles (93 km).]] Astronomy (Greek: αστρονομία = άστρον + νόμος, astronomia = astron + nomos, literally, "law of the stars") is the science of celestial objects and phenomena that originate outside the Earth's atmosphere, such as stars, planets, comets, galaxies, and the cosmic background radiation. It is concerned with the formation and development of the universe, the evolution and physical and chemical properties of celestial objects and the calculation of their motions. Astronomical observations are not only relevant for astronomy as such, but provide essential information for the verification of fundamental theories in physics, such as general relativity theory. Complementary to observational astronomy, theoretical astrophysics seeks to explain astronomical phenomena. Astronomy is one of the oldest sciences, with a scientific methodology existing at the time of Ancient Greece and advanced observation techniques possibly much earlier (see archaeoastronomy). Historically, amateurs have contributed to many important astronomical discoveries, and astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and observation of transient phenomena. Astronomy is not to be confused with astrology, which assumes that people's destiny and human affairs in general are correlated to the apparent positions of astronomical objects in the sky -- although the two fields share a common origin, they are quite different; astronomers embrace the scientific method, while astrologers do not. In other words, there is no proof that the stars predict our future, but there is proof that our planet is 93 million miles from the sun.

Divisions

In ancient Greece and other early civilizations, astronomy consisted largely of astrometry, measuring positions of stars and planets in the sky. Later, the work of Kepler and Newton, whose work led to the development of celestial mechanics, mathematically predicting the motions of celestial bodies interacting under gravity, and solar system objects in particular. Much of the effort in these two areas, once done largely by hand, is highly automated nowadays, to the extent that they are rarely considered as independent disciplines anymore. Motions and positions of objects are now more easily determined, and modern astronomy is more concerned with observing and understanding the actual physical nature of celestial objects. Since the twentieth century, the field of professional astronomy has split into observational astronomy and theoretical astrophysics. Although most astronomers incorporate elements of both into their research, because of the different skills involved, most professional astronomers tend to specialize in one or the other. Observational astronomy is concerned mostly with acquiring data, which involves building and maintaining instruments and processing the results; this branch is at times referred to as "astrometry" or simply as "astronomy". Theoretical astrophysics is concerned mainly with ascertaining the observational implications of different models, and involves working with computer or analytic models. The fields of study can also be categorized in other ways. Categorization by the region of space under study (for example, Galactic astronomy, Planetary Sciences); by subject, such as star formation or cosmology; or by the method used for obtaining information.

By subject or problem addressed

theoretical astrophysics. Photographed by Mars Global Surveyor, the long dark streak is formed by a moving swirling column of Martian atmosphere (with similarities to a terrestrial tornado). The dust devil itself (the black spot) is climbing the crater wall. The streaks on the right are sand dunes on the crater floor.]]
- Astrometry: the study of the position of objects in the sky and their changes of position. Defines the system of coordinates used and the kinematics of objects in our galaxy.
- Astrophysics: the study of physics of the universe, including the physical properties (luminosity, density, temperature, chemical composition) of astronomical objects.
- Cosmology: the study of the origin of the universe and its evolution. The study of cosmology is theoretical astrophysics at its largest scale.
- Galaxy formation and evolution: the study of the formation of the galaxies, and their evolution.
- Galactic astronomy: the study of the structure and components of our galaxy and of other galaxies.
- Extragalactic astronomy: the study of objects (mainly galaxies) outside our galaxy.
- Stellar astronomy: the study of the stars.
- Stellar evolution: the study of the evolution of stars from their formation to their end as a stellar remnant.
- Star formation: the study of the condition and processes that led to the formation of stars in the interior of gas clouds, and the process of formation itself.
- Planetary Sciences: the study of the planets of the Solar System.
- Astrobiology: the study of the advent and evolution of biological systems in the Universe. Other disciplines that may be considered part of astronomy:
- Archaeoastronomy
- Astrochemistry
- Astrosociobiology
- Astrophilosophy See the list of astronomical topics for a more exhaustive list of astronomy-related pages.

Ways of obtaining information

list of astronomical topics :Main article: Observational astronomy. In astronomy, information is mainly received from the detection and analysis of light and other forms of electromagnetic radiation. Other cosmic rays are also observed, and several experiments are designed to detect gravitational waves in the near future. A traditional division of astronomy is given by the region of the electromagnetic spectrum observed:
- Optical astronomy is the part of astronomy that uses optical components (mirrors, lenses, CCD detectors and photographic films) to observe light from near infrared to near ultraviolet wavelengths. Visible light astronomy (using wavelengths that can be detected with the eyes, about 400 - 700 nm) falls in the middle of this range. The most common tool is the telescope, with electronic imagers and spectrographs.
- Infrared astronomy deals with the detection and analysis of infrared radiation (wavelengths longer than red light). The most common tool is the telescope but using a detector which is sensitive to the infrared. Space telescopes are also used to avoid atmospheric thermal emission, atmospheric opacity, and the effects of astronomical seeing at infrared and other wavelengths.
- Radio astronomy detects radiation of millimetre to dekametre wavelength. The receivers are similar to those used in radio broadcast transmission but much more sensitive. See also Radio telescopes.
- High-energy astronomy includes X-ray astronomy, gamma-ray astronomy, and extreme UV (ultraviolet) astronomy, as well as studies of neutrinos and cosmic rays. Optical and radio astronomy can be performed with ground-based observatories, because the atmosphere is transparent at the wavelengths being detected. Infrared light is heavily absorbed by water vapor, so infrared observatories have to be located in high, dry places or in space. The atmosphere is opaque at the wavelengths of X-ray astronomy, gamma-ray astronomy, UV astronomy and (except for a few wavelength "windows") Far infrared astronomy, so observations must be carried out mostly from balloons or space observatories. Powerful gamma rays can, however be detected by the large air showers they produce, and the study of cosmic rays can also be regarded as a branch of astronomy.

History of astronomy

cosmic ray :Main article: History of astronomy. In early times, astronomy only comprised the observation and predictions of the motions of the naked-eye objects. Aristotle said that the Earth was the center of the Universe and everything rotated around it in orbits that were perfect circles. Aristotle had to be right because people thought that Earth had to be in the center with everything rotating around it because the wind would not scatter leaves, and birds would only fly in one direction. For a long time, people thought that Aristotle was right, but it is probable that Aristotle accidentally did more to hinder our knowledge than help it. The Rigveda refers to the 27 constellations associated with the motions of the sun and also the 12 zodiacal divisions of the sky. The ancient Greeks made important contributions to astronomy, among them the definition of the magnitude system. The Bible contains a number of statements on the position of the earth in the universe and the nature of the stars and planets, most of which are poetic rather than literal; see Biblical cosmology. In 500 AD, Aryabhata presented a mathematical system that described the earth as spinning on its axis and considered the motions of the planets with respect to the sun. Observational astronomy was mostly stagnant in medieval Europe, but flourished in the Iranian world and other parts of Islamic realm. The late 9th century Persian astronomer al-Farghani wrote extensively on the motion of celestial bodies. His work was translated into Latin in the 12th century. In the late 10th century, a huge observatory was built near Tehran, Persia (now Iran), by the Persian astronomer al-Khujandi, who observed a series of meridian transits of the Sun, which allowed him to calculate the obliquity of the ecliptic. Also in Persia, Omar Khayyám performed a reformation of the calendar that was more accurate than the Julian and came close to the Gregorian. Abraham Zacuto was responsible in the 15th century for the adaptations of astronomical theory for the practical needs of Portuguese caravel expeditions. During the Renaissance, Copernicus proposed a heliocentric model of the