1.
Minor planet
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A minor planet is an astronomical object in direct orbit around the Sun that is neither a planet nor exclusively classified as a comet. Minor planets can be dwarf planets, asteroids, trojans, centaurs, Kuiper belt objects, as of 2016, the orbits of 709,706 minor planets were archived at the Minor Planet Center,469,275 of which had received permanent numbers. The first minor planet to be discovered was Ceres in 1801, the term minor planet has been used since the 19th century to describe these objects. The term planetoid has also used, especially for larger objects such as those the International Astronomical Union has called dwarf planets since 2006. Historically, the asteroid, minor planet, and planetoid have been more or less synonymous. This terminology has become complicated by the discovery of numerous minor planets beyond the orbit of Jupiter. A Minor planet seen releasing gas may be classified as a comet. Before 2006, the IAU had officially used the term minor planet, during its 2006 meeting, the IAU reclassified minor planets and comets into dwarf planets and small Solar System bodies. Objects are called dwarf planets if their self-gravity is sufficient to achieve hydrostatic equilibrium, all other minor planets and comets are called small Solar System bodies. The IAU stated that the minor planet may still be used. However, for purposes of numbering and naming, the distinction between minor planet and comet is still used. Hundreds of thousands of planets have been discovered within the Solar System. The Minor Planet Center has documented over 167 million observations and 729,626 minor planets, of these,20,570 have official names. As of March 2017, the lowest-numbered unnamed minor planet is 1974 FV1, as of March 2017, the highest-numbered named minor planet is 458063 Gustavomuler. There are various broad minor-planet populations, Asteroids, traditionally, most have been bodies in the inner Solar System. Near-Earth asteroids, those whose orbits take them inside the orbit of Mars. Further subclassification of these, based on distance, is used, Apohele asteroids orbit inside of Earths perihelion distance. Aten asteroids, those that have semi-major axes of less than Earths, Apollo asteroids are those asteroids with a semimajor axis greater than Earths, while having a perihelion distance of 1.017 AU or less. Like Aten asteroids, Apollo asteroids are Earth-crossers, amor asteroids are those near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it
2.
Czechs
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Ethnic Czechs were called Bohemians in English until the early 20th century, referring to the late Iron Age tribe of Celtic Boii and the land Bohemia. The Czech diaspora is found in numbers in the United States, Canada, Israel, Austria, Germany, Slovakia, Switzerland, Italy. The Czech ethnic group is part of the West Slavic subgroup of the larger Slavic ethno-linguistical group, the West Slavs have origin in early Slavic tribes which settled in Central Europe after East Germanic tribes had left this area during the migration period. The West Slavic tribe of Bohemians settled in the area of Bohemia during the migration period and they formed an independent principality in the 9th century, the Duchy of Bohemia, under the Přemyslid dynasty. According to mythology, the father of the Czech people were Forefather Čech. The Czech are closely related to the neighbouring Slovaks, the Czech–Slovak languages form a dialect continuum rather than being two clearly distinct languages. Czech cultural influence in Slovak culture is noted as having much higher than the other way around. Czech people have a history of coexistence with Germanic people. The Czech National Revival took place in the 18th and 19th centuries aiming to revive Czech language, culture, the Czech were the initiators of Pan-Slavism. The Czech ethnonym was the name of a Slavic tribe in central Bohemia that subdued the tribes in the late 9th century. The origin of the name of the tribe itself is unknown, according to legend, it comes from their leader Čech, who brought them to Bohemia. Research regards Čech as a derivative of the root čel-, the Czech ethnonym was adopted by the Moravians in the 19th century. The name Bohemia is Germanic, English used that name until after the establishment of Czechoslovakia, the population of the Czech lands has been influenced by different human migrations that wide-crossed Europe over time. In their Y-DNA haplogroups, which are inherited along the male line,34. 2% of Czech males belong to R1a, which is particularly common in a large region extending from South Asia and Southern Siberia to Central Europe and Scandinavia. The population of the Czech Republic descends from diverse peoples of Slavic, Celtic and Germanic origin, presence of West Slavs in the 6th century during the Migration Period has been documented on the Czech territory. Slavs settled in Bohemia, Moravia and Austria sometime during the 6th or 7th centuries, according to a popular myth, the Slavs came with Forefather Čech who settled at the Říp Mountain. The Duchy of Bohemia emerged in the late 9th century, in 880, Prague Castle was constructed by Prince Bořivoj, founder of the Přemyslid dynasty and the city of Prague was established. Vratislav II was the first Czech king in 1085 and the duchy was raised to a kingdom under Ottokar I in 1198
3.
Astronomer
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An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside of the scope of Earth. They look at stars, planets, moons, comets and galaxies, as well as other celestial objects — either in observational astronomy. Examples of topics or fields astronomers work on include, planetary science, solar astronomy, there are also related but distinct subjects like physical cosmology which studies the Universe as a whole. Astronomers usually fit into two types, Observational astronomers make direct observations of planets, stars and galaxies, and analyze the data, theoretical astronomers create and investigate models of things that cannot be observed. They use this data to create models or simulations to theorize how different celestial bodies work, there are further subcategories inside these two main branches of astronomy such as planetary astronomy, galactic astronomy or physical cosmology. Today, that distinction has disappeared and the terms astronomer. Professional astronomers are highly educated individuals who typically have a Ph. D. in physics or astronomy and are employed by research institutions or universities. They spend the majority of their time working on research, although quite often have other duties such as teaching, building instruments. The number of astronomers in the United States is actually quite small. The American Astronomical Society, which is the organization of professional astronomers in North America, has approximately 7,000 members. This number includes scientists from other such as physics, geology. The International Astronomical Union comprises almost 10,145 members from 70 different countries who are involved in research at the Ph. D. level. Before CCDs, photographic plates were a method of observation. Modern astronomers spend relatively little time at telescopes usually just a few weeks per year, analysis of observed phenomena, along with making predictions as to the causes of what they observe, takes the majority of observational astronomers time. Astronomers who serve as faculty spend much of their time teaching undergraduate and graduate classes, most universities also have outreach programs including public telescope time and sometimes planetariums as a public service to encourage interest in the field. Those who become astronomers usually have a background in maths, sciences. Taking courses that teach how to research, write and present papers are also invaluable, in college/university most astronomers get a Ph. D. in astronomy or physics. Keeping in mind how few there are it is understood that graduate schools in this field are very competitive
4.
Comet
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A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to evolve gasses, a process called outgassing. This produces an atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of collections of ice, dust. The coma may be up to 15 times the Earths diameter, if sufficiently bright, a comet may be seen from the Earth without the aid of a telescope and may subtend an arc of 30° across the sky. Comets have been observed and recorded since ancient times by many cultures, Comets usually have highly eccentric elliptical orbits, and they have a wide range of orbital periods, ranging from several years to potentially several millions of years. Short-period comets originate in the Kuiper belt or its associated scattered disc, long-period comets are thought to originate in the Oort cloud, a spherical cloud of icy bodies extending from outside the Kuiper belt to halfway to the nearest star. Long-period comets are set in motion towards the Sun from the Oort cloud by gravitational perturbations caused by passing stars, hyperbolic comets may pass once through the inner Solar System before being flung to interstellar space. The appearance of a comet is called an apparition, Comets are distinguished from asteroids by the presence of an extended, gravitationally unbound atmosphere surrounding their central nucleus. This atmosphere has parts termed the coma and the tail, however, extinct comets that have passed close to the Sun many times have lost nearly all of their volatile ices and dust and may come to resemble small asteroids. Asteroids are thought to have a different origin from comets, having formed inside the orbit of Jupiter rather than in the outer Solar System, the discovery of main-belt comets and active centaur minor planets has blurred the distinction between asteroids and comets. As of November 2014 there are 5,253 known comets, however, this represents only a tiny fraction of the total potential comet population, as the reservoir of comet-like bodies in the outer Solar System is estimated to be one trillion. Roughly one comet per year is visible to the eye, though many of those are faint. Particularly bright examples are called Great Comets, the word comet derives from the Old English cometa from the Latin comēta or comētēs. That, in turn, is a latinisation of the Greek κομήτης, Κομήτης was derived from κομᾶν, which was itself derived from κόμη and was used to mean the tail of a comet. The astronomical symbol for comets is ☄, consisting of a disc with three hairlike extensions. The solid, core structure of a comet is known as the nucleus, cometary nuclei are composed of an amalgamation of rock, dust, water ice, and frozen gases such as carbon dioxide, carbon monoxide, methane, and ammonia. As such, they are described as dirty snowballs after Fred Whipples model
5.
Comet Kohoutek
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Comet Kohoutek, formally designated C/1973 E1,1973 XII, and 1973f, was first sighted on 7 March 1973 by Czech astronomer Luboš Kohoutek. It attained perihelion on 28 December that same year, Comet Kohoutek is a long-period comet, its previous apparition was about 150,000 years ago, and its next apparition will be in about 75,000 years. At its apparition in 1973 it had a hyperbolic trajectory due to perturbations from giant planets. Due to its path, scientists theorized that Kohoutek was an Oort-cloud object, as such, it was believed that this was the comets first visit to the inner Solar System, which would result in a spectacular display of outgassing. Before its close approach, Kohoutek was hyped by the media as the comet of the century, however, Kohouteks display was considered a let-down, possibly due to partial disintegration when the comet closely approached the Sun prior to its Earth flyby. Since this was probably the comets first visit to the inner Solar System, although it failed to brighten to levels expected, it was still a naked-eye object. Its greatest visual magnitude was −3, when it was at perihelion,0.14 AU from the Sun and its best viewing was in the night sky after perihelion, when it had dimmed to fourth magnitude. The comet also sported a tail up to 25° long, along with an anti-tail, C/1973 E1 should not be confused with the periodic comet 75D/Kohoutek, which can also be called Comet Kohoutek. In addition, there are another two long-period comets, C/1969 O1-A, and C/1973 D1 also discovered by Luboš Kohoutek, because Comet Kohoutek fell far short of expectations, its name became synonymous with spectacular duds. However, it was bright as comets go and put on a respectable show in the evenings shortly after perihelion. In 1973, David Berg, founder of the Children of God, Children of God members distributed Bergs message of doom across the country. The majority of U. S. -based members then fled in anticipation to existing communes, or formed new ones, linus eventually identifies the light as Kohoutek. The jazz composer Sun Ra performed the Concert for the Comet Kohoutek in December 1973, the first single of German avant-garde music group Kraftwerk, released in December 1973, was called Kohoutek-Kometenmelodie. On the album Autobahn, which appeared a few months later, the first album of Yahowha 13 from 1973 is called Kohoutek. Argents 1974 album Nexus begins with three linked tracks inspired by Kohoutek, The Coming of Kohoutek, Once Around the Sun, the rock band Journey wrote and recorded the instrumental Kohoutek, which appeared on their self-titled debut album Journey in 1975. Bill Carroll released an album in 1994 titled Kohoutek, the English techno group 808 State wrote and recorded the instrumental Kohoutek, which appeared on their 1996 album Don Solaris. Since January 1974, Kohoutek Music and Arts festival has been a spring event at Pitzer College honoring the comet. In the Mexican series El Chavo del Ocho, the characters are afraid of the fall of the comet
6.
Brno
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Brno is the second largest city in the Czech Republic by population and area, the largest Moravian city, and the historical capital city of the Margraviate of Moravia. Brno is the center of the South Moravian Region in which it forms a separate district. The city is also a significant administrative centre and it is the seat of a number of state authorities, including the Ombudsman, and the Office for the Protection of Competition. Brno is also an important centre of education, with 33 faculties belonging to 13 institutes of higher learning. Brno Exhibition Centre ranks among the largest exhibition centres in Europe, the complex opened in 1928 and established the tradition of large exhibitions and trade fairs held in Brno. Brno hosts motorbike and other races on the Masaryk Circuit, an established in 1930. Another cultural tradition is a fireworks competition, Ignis Brunensis. The other large preserved castle near the city is Veveří Castle by the Brno Dam Lake and this castle is the site of a number of legends, as are many other places in Brno. Another architectural monument of Brno is the functionalist Villa Tugendhat which has been included on the UNESCO list of World Heritage Sites, one of the natural sights nearby is the Moravian Karst. The etymology of the name Brno is disputed and it perhaps comes from Old Czech brnie muddy, swampy. Alternative derivations are from a Slavic verb brniti or a Celtic language spoken in the area before it was overrun by Germanic peoples, throughout its history, Brnos locals also referred to the town in other languages, including Brünn in German, ברין in Yiddish and Bruna in Latin. The city was referred to as Brunn in English. The Asteroid 2889 Brno was named after the city, as well as the Bren light machine gun, one of the most famous weapons of World War II. In the early 11th century Brno was established as a castle of a prince from the House of Přemyslid. Brno was first mentioned in Cosmas Chronica Boëmorum dated to year 1091, seats of these rulers and thus capitals of these territories were castles and towns of Brno, Olomouc, and Znojmo. In the late 12th century, Moravia began to reunify, forming the Margraviate of Moravia, since then, until the mid of the 17th century, it was not clear which town should be the capital of Moravia. Political power was therefore divided between Brno and Olomouc, but Znojmo also played an important role. The Moravian Diet, the Moravian Land Tables, and the Moravian Land Court were all seated in both cities at once, however, Brno was the official seat of the Moravian Margraves, and later its geographical position closer to Vienna also became important
7.
Prague
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Prague is the capital and largest city of the Czech Republic. It is the 14th largest city in the European Union and it is also the historical capital of Bohemia. Situated in the north-west of the country on the Vltava river, the city has a temperate climate, with warm summers and chilly winters. Prague has been a political, cultural, and economic centre of central Europe with waxing and waning fortunes during its history and it was an important city to the Habsburg Monarchy and its Austro-Hungarian Empire. Prague is home to a number of cultural attractions, many of which survived the violence. Main attractions include the Prague Castle, the Charles Bridge, Old Town Square with the Prague astronomical clock, since 1992, the extensive historic centre of Prague has been included in the UNESCO list of World Heritage Sites. The city has more than ten major museums, along with theatres, galleries, cinemas. An extensive modern public transportation system connects the city, also, it is home to a wide range of public and private schools, including Charles University in Prague, the oldest university in Central Europe. Prague is classified as an Alpha- global city according to GaWC studies, Prague ranked sixth in the Tripadvisor world list of best destinations in 2016. Its rich history makes it a popular tourist destination, and the city more than 6.4 million international visitors annually. Prague is the fifth most visited European city after London, Paris, Istanbul, the region was settled as early as the Paleolithic age. In the last century BC, the Celts were slowly driven away by Germanic tribes, around the area where present-day Prague stands, the 2nd century map of Ptolemaios mentioned a Germanic city called Casurgis. In the following century, the Czech tribes built several fortified settlements in the area, most notably in Levý Hradec, Butovice and in the Šárka valley. The construction of what came to be known as the Prague Castle began near the end of the 9th century, the first masonry under Prague Castle dates from the year 885 at the latest. The other prominent Prague fort, the Přemyslid fort Vyšehrad, was founded in the 10th century, Prague Castle is dominated by the cathedral, which was founded in 1344, but completed in the 20th century. The legendary origins of Prague attribute its foundation to the 8th century Czech duchess and prophetess Libuše and her husband, Přemysl, legend says that Libuše came out on a rocky cliff high above the Vltava and prophesied, I see a great city whose glory will touch the stars. She ordered a castle and a town called Praha to be built on the site, a 17th century Jewish chronicler David Solomon Ganz, citing Cyriacus Spangenberg, claimed that the city was founded as Boihaem in c.1306 BC by an ancient king, Boyya. The region became the seat of the dukes, and later kings of Bohemia, under Roman Emperor Otto II the area became a bishopric in 973
8.
Hamburg Observatory
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Hamburg Observatory is an astronomical observatory located in the Bergedorf borough of the city of Hamburg in northern Germany. It is owned and operated by the University of Hamburg, Germany since 1968, although it was founded in 1825 by the City of Hamburg and moved to its present location in 1912. It has operated telescopes at Bergedorf, at two locations in Hamburg, at other observatories around the world, and it has also supported space missions. The precursor of Hamburg Observatory was an observatory by Johann Georg Repsold built in 1802. It started in 1803 with a meridian circle built by Repsold in 1808, however, it was destroyed in 1811 by a war. Repsold, Reinke, and J. C. von Hess submitted a proposal to Hamburg for city observatory that same year, funding for a new Observatory was approved in August 1821, on the condition J. G. Repsold built the instruments. The new observatory was completed in 1825 next to the Millerntor, however, in 1830 Repsold died while fighting a fire and the City of Hamburg voted to take over and continue running the observatory in 1833. First director became Charles Rümker who har accompanied Thomas Brisbane to build the first Australian observatory at Parramatta, christian August Friedrich Peters became assistant director in 1834. In 1856 Rümkers son George became director of the observatory, in 1876 funding was received for The Equatorial, a 27 cm refractor, it was later moved to Bergedorf. After the move to Bergedorf, the site was partially demolished, because of the increasing light pollution, in 1906 it was decided to move the observatory to Bergedorf. In 1909 the first instruments were moved there, and in 1912 the new observatory was officially dedicated, the European Southern Observatory was founded at Bergedorf in 1962. The Hamburg 1m Reflector was the fourth largest reflector when it began operations in 1911. Catalogs include the AGK3-Sternkatalog In 1968 the observatory part of Hamburg University. In 1979 a small museum to Bernard Schmidt was inaugurated, in 2012,100 years at Bergedorf was celebrated. Telescopes The Great Refractor, a refractor telescope with an objective diameter. By Repsold, and with optics from Steinheil, the Equatorial, a refractor with aperture of 26 cm and focal length. Built in the 1870s and moved to Bergedorf, salvador Mirror, a Cassegrain with 8 m focal length and 40 cm mirror. The Meridian Circle, a meridian circle built in 1907, Lippert Telescope, three astrographs refractors on one mount
