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Taavet Rootsmäe
Taavet Rootsmäe (until 1936 David Rootsman; 27 June 1885 Tartu County – 27 June 1959 Tartu) was an Estonian astronomer. In 1913 he graduated from Tartu University. Since 1919 he taught at Tartu University (was a professor). From 1919 to 1948 he was the first head of University of Tartu Old Observatory. His main fields of research were stellar astronomy, theoretical astronomy, and celestial mechanics. With Ernst Öpik Ernst Julius Öpik ( – 10 September 1985) was an Estonian astronomer and astrophysicist who spent the second half of his career (1948–1981) at the Armagh Observatory in Northern Ireland. Education Öpik was born in Kunda, Estonia, Kunda, Lä ..., he is considered the founder of Estonian astronomy school. References {{DEFAULTSORT:Rootsmae, Taavet 1885 births 1959 deaths Estonian astronomers 20th-century Estonian people ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taavet Rootsmäe
Taavet Rootsmäe (until 1936 David Rootsman; 27 June 1885 Tartu County – 27 June 1959 Tartu) was an Estonian astronomer. In 1913 he graduated from Tartu University. Since 1919 he taught at Tartu University (was a professor). From 1919 to 1948 he was the first head of University of Tartu Old Observatory. His main fields of research were stellar astronomy, theoretical astronomy, and celestial mechanics. With Ernst Öpik Ernst Julius Öpik ( – 10 September 1985) was an Estonian astronomer and astrophysicist who spent the second half of his career (1948–1981) at the Armagh Observatory in Northern Ireland. Education Öpik was born in Kunda, Estonia, Kunda, Lä ..., he is considered the founder of Estonian astronomy school. References {{DEFAULTSORT:Rootsmae, Taavet 1885 births 1959 deaths Estonian astronomers 20th-century Estonian people ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tartu County
Tartu County ( et, Tartu maakond or ''Tartumaa'') is one of 15 counties of Estonia. It is located in eastern Estonia bordering Põlva County, Valga County, Viljandi County and Jõgeva County. The area of Tartu County is , which covers 6.9% of the territory of Estonia. In January 2013 Tartu County had a population of 150,139 – constituting 11.6% of the total population in Estonia. The city of Tartu is the centre of the county located at a distance of from Tallinn. Tartu County is divided into 8 local governments – 1 urban and 7 rural municipalities. Geography Tartu County lies in South Estonia, between Lake Võrtsjärv and Lake Peipsi. Estonia's only navigable river, River Emajõgi (100 km long), flows through the county, connecting Lake Peipsi and Lake Võrtsjärv. Wavy plains are typical landscapes of Tartu County. One third of the county is covered with forests, a third is cultivated. A quarter is made up of wetlands at the headwaters and lower course of the Emajõ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tartu
Tartu is the second largest city in Estonia after the Northern European country's political and financial capital, Tallinn. Tartu has a population of 91,407 (as of 2021). It is southeast of Tallinn and 245 kilometres (152 miles) northeast of Riga, Latvia. Tartu lies on the Emajõgi river, which connects the two largest lakes in Estonia, Lake Võrtsjärv and Lake Peipus. From the 13th century until the end of the 19th century, Tartu was known in most of the world by variants of its historical name Dorpat. Tartu, the largest urban centre of southern Estonia, is often considered the "intellectual capital city" of the country, especially as it is home to the nation's oldest and most renowned university, the University of Tartu (founded in 1632). Tartu also houses the Supreme Court of Estonia, the Ministry of Education and Research, the Estonian National Museum, and the oldest Estonian-language theatre, Vanemuine. It is also the birthplace of the Estonian Song Festivals. Tar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estonians
Estonians or Estonian people ( et, eestlased) are a Finnic ethnic group native to Estonia who speak the Estonian language. The Estonian language is spoken as the first language by the vast majority of Estonians; it is closely related to other Finnic languages, e.g. Finnish, Karelian and Livonian. The Finnic languages are a subgroup of the larger Uralic family of languages, which also includes, e.g., the Sami languages. These languages are markedly different from most other native languages spoken in Europe, most of which have been assigned to Indo-European family of languages. Estonians can also be classified into subgroups according to dialects (e.g., Võros, Setos), although such divisions have become less pronounced due to internal migration and rapid urbanisation in Estonia in the 20th century. There are approximately 1.1 million ethnic Estonians and their descendants with some degree of Estonian identity worldwide; the large majority of them are living in Estonia. H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tartu University
The University of Tartu (UT; et, Tartu Ülikool; la, Universitas Tartuensis) is a university in the city of Tartu in Estonia. It is the national university of Estonia. It is the only classical university in the country, and also its biggest and most prestigious university. It was founded under the name of ''Academia Gustaviana'' in 1632 by Baron Johan Skytte, the Governor-General (1629–1634) of Swedish Livonia, Ingria, and Karelia, with the required ratification provided by his long-time friend and former student – from age 7 –, King Gustavus Adolphus, shortly before the king's death on 6 November in the Battle of Lützen (1632), during the Thirty Years' War (1618–1648). Nearly 14,000 students are at the university, of whom over 1,300 are foreign students. The language of instruction in most curricula is Estonian, some more notable exceptions are taught in English, such as semiotics, applied measurement science, computer science, information technology law, and E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Tartu Old Observatory
University of Tartu Old Observatory or Tartu Old Observatory ( et, Tartu Tähetorn) is an observatory in Tartu, Estonia. Tartu Observatory was an active observatory from 1810 to 1964. The building now serves as a museum and belongs to the University of Tartu Museum. History Construction of the observatory started in 1808. While it was completed in 1810, setting up the necessary instruments took a few years more. The last of them was the Fraunhofer ''Great Dorpat Refractor'', that was the largest refracting telescope at the time and was constructed in 1824. It has been titled as "the first modern, achromatic, refracting telescope". Since 1813, Friedrich Georg Wilhelm von Struve worked there and in 1820 he became a professor and director of the observatory. He studied double stars and was the first to measure the exact distance to a star, Vega. He also created the Struve Geodetic Arc, that is now enlisted as a UNESCO World Heritage Site. Tartu Old Observatory was the first me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellar Astronomy
Astronomy () is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky. These include the Babylonians, Greeks, Indians, Egyptians, Chinese, Maya, and many ancient indigenous peoples of the Americas. In the past, astronomy included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars. Nowadays, professional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theoretical Astronomy
Theoretical astronomy is the use of analytical and computational models based on principles from physics and chemistry to describe and explain astronomical objects and astronomical phenomena. Theorists in astronomy endeavor to create theoretical models and from the results predict observational consequences of those models. The observation of a phenomenon predicted by a model allows astronomers to select between several alternate or conflicting models as the one best able to describe the phenomena. Ptolemy's ''Almagest'', although a brilliant treatise on theoretical astronomy combined with a practical handbook for computation, nevertheless includes compromises to reconcile discordant observations with a geocentric model. Modern theoretical astronomy is usually assumed to have begun with the work of Johannes Kepler (1571–1630), particularly with Kepler's laws. The history of the descriptive and theoretical aspects of the Solar System mostly spans from the late sixteenth century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celestial Mechanics
Celestial mechanics is the branch of astronomy that deals with the motions of objects in outer space. Historically, celestial mechanics applies principles of physics (classical mechanics) to astronomical objects, such as stars and planets, to produce ephemeris data. History Modern analytic celestial mechanics started with Isaac Newton's Principia of 1687. The name "celestial mechanics" is more recent than that. Newton wrote that the field should be called "rational mechanics." The term "dynamics" came in a little later with Gottfried Leibniz, and over a century after Newton, Pierre-Simon Laplace introduced the term "celestial mechanics." Prior to Kepler there was little connection between exact, quantitative prediction of planetary positions, using geometrical or arithmetical techniques, and contemporary discussions of the physical causes of the planets' motion. Johannes Kepler Johannes Kepler (1571–1630) was the first to closely integrate the predictive geom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernst Öpik
Ernst Julius Öpik ( – 10 September 1985) was an Estonian astronomer and astrophysicist who spent the second half of his career (1948–1981) at the Armagh Observatory in Northern Ireland. Education Öpik was born in Kunda, Estonia, Kunda, Lääne-Viru County, Lääne-Viru, Governorate of Estonia, then a part of the Russian Empire. He went to the University of Moscow to specialize in the study of minor bodies, such as asteroids, comets, and meteors. He completed his doctorate at the University of Tartu. Astronomical work In 1916 Öpik published an article in the ''Astrophysical Journal'', in which he estimated the densities of visual binary stars. In his sample was 40 Eridani B, ο2 Eridani B, a white dwarf star. Öpik determined its density as 25,000 times the density of the Sun but concluded that the result is impossible. In 1922, Ernst Öpik published a paper in which he estimated the distance of the Andromeda Galaxy. He determined the distance using a novel astrophysical m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1885 Births
Events January–March * January 3– 4 – Sino-French War – Battle of Núi Bop: French troops under General Oscar de Négrier defeat a numerically superior Qing Chinese force, in northern Vietnam. * January 4 – The first successful appendectomy is performed by Dr. William W. Grant, on Mary Gartside. * January 17 – Mahdist War in Sudan – Battle of Abu Klea: British troops defeat Mahdist forces. * January 20 – American inventor LaMarcus Adna Thompson patents a roller coaster. * January 24 – Irish rebels damage Westminster Hall and the Tower of London with dynamite. * January 26 – Mahdist War in Sudan: Troops loyal to Mahdi Muhammad Ahmad conquer Khartoum; British commander Charles George Gordon is killed. * February 5 – King Leopold II of Belgium establishes the Congo Free State, as a personal possession. * February 9 – The first Japanese arrive in Hawaii. * February 16 – Charles Dow publishes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1959 Deaths
Events January * January 1 - Cuba: Fulgencio Batista flees Havana when the forces of Fidel Castro advance. * January 2 - Lunar probe Luna 1 was the first man-made object to attain escape velocity from Earth. It reached the vicinity of Earth's Moon, and was also the first spacecraft to be placed in heliocentric orbit. * January 3 ** The three southernmost atolls of the Maldive Islands, Maldive archipelago (Addu Atoll, Huvadhu Atoll and Fuvahmulah island) United Suvadive Republic, declare independence. ** Alaska is admitted as the 49th U.S. state. * January 4 ** In Cuba, rebel troops led by Che Guevara and Camilo Cienfuegos enter the city of Havana. ** Léopoldville riots: At least 49 people are killed during clashes between the police and participants of a meeting of the ABAKO Party in Kinshasa, Léopoldville in the Belgian Congo. * January 6 ** Fidel Castro arrives in Havana. ** The International Maritime Organization is inaugurated. * January 7 – The United States reco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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