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Archenhold Observatory
The Archenhold Observatory () was named in honour of Friedrich Simon Archenhold, is an observatory in Berlin-Treptow. It houses the ''Großer Refraktor'' (Great Refractor), which is the longest pointable telescope in the world. It is also called the ''Himmelskanone'' (Celestial Cannon). History Industrial Exposition The Archenhold Observatory began as a temporary installation at the 1896 Great Industrial Exposition of Berlin. At the initiative of Wilhelm Foerster and Max Wilhelm Meyer, it was intended to present scientific and astronomical knowledge to the general public. Plans for a large telescope that Friedrich Simon Archenhold had been working on were invoked for this purpose. Although his plans were for a research instrument, its design was already being criticised at the time. Admittance charges at the exposition were intended to finance the construction and later relocation of the instrument. The telescope was erected in the Treptower Park and sheltered in a wooden bui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berlin Treptow Archenhold Sternwarte
Berlin is the capital and largest city of Germany, both by area and by population. Its more than 3.85 million inhabitants make it the European Union's most populous city, as measured by population within city limits having gained this status after the United Kingdom's, and thus London's, departure from the European Union. Simultaneously, the city is one of the states of Germany, and is the third smallest state in the country in terms of area. Berlin is surrounded by the state of Brandenburg, and Brandenburg's capital Potsdam is nearby. The urban area of Berlin has a population of over 4.5 million and is therefore the most populous urban area in Germany. The Berlin-Brandenburg capital region has around 6.2 million inhabitants and is Germany's second-largest metropolitan region after the Rhine-Ruhr region, and the fifth-biggest metropolitan region by GDP in the European Union. Berlin was built along the banks of the Spree river, which flows into the Havel in the western bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies of World War II, Allies and the Axis powers. World War II was a total war that directly involved more than 100 million Military personnel, personnel from more than 30 countries. The major participants in the war threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. Air warfare of World War II, Aircraft played a major role in the conflict, enabling the strategic bombing of population centres and deploying the Atomic bombings of Hiroshima and Nagasaki, only two nuclear weapons ever used in war. World War II was by far the List of wars by death toll, deadliest conflict in hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Length
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system's optical power. In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Museum Of Technology
(German Museum of Technology) in Berlin, Germany is a museum of science and technology, and exhibits a large collection of historical technical artifacts. The museum's main emphasis originally was on rail transport, but today it also features exhibits of various sorts of industrial technology. In 2003, it opened both maritime and aviation exhibition halls in a newly built extension. The museum also contains a science center called Spectrum. History The Museum of Traffic and Technology (') was founded in 1982 and assumed the tradition of the Royal Museum of Traffic and Construction (') which was opened in the former station building in 1906. The present-day museum is located on the former freight yard attached to the in the district of Berlin, including two historic roundhouses and several office buildings. Renamed ' in 1996, the exhibition area was gradually expanded. An adjacent new building complex was inaugurated in 2003, topped by a prominent US Air Force Douglas C-47B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Reunification
German reunification (german: link=no, Deutsche Wiedervereinigung) was the process of re-establishing Germany as a united and fully sovereign state, which took place between 2 May 1989 and 15 March 1991. The day of 3 October 1990 when the German Reunification Treaty entered into force dissolving the German Democratic Republic (GDR; german: link=no, Deutsche Demokratische Republik, DDR, or East Germany) and integrating its recently re-established constituent federated states into the Federal Republic of Germany (FRG; german: link=no, Bundesrepublik Deutschland, BRD, or West Germany) to form present-day Germany, has been chosen as the customary '' German Unity Day'' () and has thereafter been celebrated each year from 1991 as a national holiday. East and West Berlin were united into a single city and eventually became the capital of reunited Germany. The East Germany's government led by the Socialist Unity Party of Germany (SED) (a communist party) started to falter on 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernst-Thälmann-Park
Ernst-Thälmann-Park is a park in the centre of the Prenzlauer Berg district in Berlin. It was laid out in 1986 at the site of a former coal gas plant and named after the former Communist party leader Ernst Thälmann (1886-1944). The former plant built in 1874 was closed in 1981, the last gasometer was demolished in 1984. In honor of Berlin's 750-year jubilee the East German government drew up plans for an "inhabited park", including a memorial, a public pool, a planetarium, a school and a housing estate for 4,000 residents. The park was inaugurated on 16 April 1986, Thälmann's hundredth birthday. The former use of the area left an extensive contamination of soil and groundwater with cyanides, phenols and tar that after German reunification had to be cleared by excavation and bioremediation. Though there had been some discussion about the name, a majority of dwellers voted against a change in 1997. Today the park features public houses as well as art galleries and a small theatr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeiss Major Planetarium
The Zeiss Major Planetarium (German ) is a planetarium in Berlin, and one of the largest modern stellar theatres in Europe. It is located on the borders of the Ernst-Thälmann-Park housing estates in the Prenzlauer Berg locality of Berlin. History It was one of the last buildings built in the GDR, constructed in 1987, the 750th anniversary of Berlin. Planning for the area commenced with old gas works to be torn down by 1981. The anniversary gave an opportunity to the Communist government to create a new style of housing estate with decorative high-rise residential buildings, a cultural centre with restaurants, and a planetarium supposed to be larger than the old one in the Archenhold Observatory of Berlin. The building was designed by architect , and opened on schedule on 9 October 1987. Description The dome of the main hall has a diameter of and is equipped with a ''Universarium IX'' planetarium projector from Carl Zeiss AG. There is also a café and a movie theatre w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetarium
A planetarium ( planetariums or ''planetaria'') is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation. A dominant feature of most planetariums is the large dome-shaped projection screen onto which scenes of stars, planets, and other celestial objects can be made to appear and move realistically to simulate their motion. The projection can be created in various ways, such as a star ball, slide projector, video, fulldome projector systems, and lasers. Typical systems can be set to simulate the sky at any point in time, past or present, and often to depict the night sky as it would appear from any point of latitude on Earth. Planetaria range in size from the 37 meter dome in St. Petersburg, Russia (called “Planetarium No 1”) to three-meter inflatable portable domes where attendees sit on the floor. The largest planetarium in the Western Hemisphere is the Jennifer Chalsty P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dieter B
Dieter or dieter may refer to: * A person committed to dieting People Dieter is a German given name (), a short form of Dietrich, from ''theod+ric'' "people ruler", see Theodoric. Given name *Dieter Althaus (born 1958), German politician *Dieter Bohlen (born 1954), German music producer *Dieter Borsche (1909–1982), German actor *Dieter Brummer (1976–2021), Australian actor *Dieter Dengler (1938–2001), American Vietnam War veteran *Dieter Dierks (born 1943), German musician *Dieter Eiselen (born 1996), South African American football player *Dieter Gerhardt (born 1935), Soviet spy *Dieter Hallervorden (born 1935), German comedian *Dieter Thomas Heck (1937–2018), German television presenter, singer and actor *Dieter Helm (1941–2022), German farmer and politician *Dieter Hoeneß (born 1953), German football (soccer) player *Dieter Kühn (born 1956), East German football (soccer) player *Dieter Lüst (born 1956), German physicist *Dieter Meier (born 1945), Swiss musi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
