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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 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 .... With Ernst Öpik, he is considered the founder of Estonian astronomy school. References 1885 births 1959 deaths Estonian astronomers 20th-century Estonian people {{Estonia-academic-bio-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tartu County
Tartu County ( 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 2022 Tartu County had a population of 157,758 – constituting 11.9% 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 Peipus. Estonia's only navigable river, River Emajõgi (100 km long), flows through the county, connecting Lake Peipus 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 Emajõgi. In the northern pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tartu
Tartu is the second largest city in Estonia after Tallinn. Tartu has a population of 97,759 (as of 2024). 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 (Estonia), 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. Tartu was designated as the E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estonians
Estonians or Estonian people () are a Finnic ethnic group native to the Baltic Sea region in Northern Europe, primarily their nation state of Estonia. Estonians primarily speak the Estonian language, a language 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 the 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 million ethnic Estonians worldwide, with the vast majority of them residing in their native Estonia. Estonian diaspora communities formed primarily in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tartu University
The University of Tartu (UT; ; ) is a Public university, public research university located in the city of Tartu, Estonia. It is the national university of Estonia. It is also the largest and oldest university in the country.About the University University of Tartu The university was founded under the name of ''Academia Gustaviana'' in 1632 by Baron Johan Skytte, the Swedish Governors-General, Governor-General of Swedish Livonia, Swedish Ingria, Ingria, and Karelia (historical province of Finland), Karelia, with the required ratification provided by King Gustavus Adolphus of Sweden, Gustavus Adolphus, shortly before the king's death on 6 November in the Battle of Lützen (1632). 15,206 students study at the university, of whom over 1,500 are foreigners (10%). Most of the curriculum is instructed in Estonian. How ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Tartu Old Observatory
University of Tartu Old Observatory or Tartu Old Observatory () 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 measurement point of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellar Astronomy
Astronomy is a natural science that studies astronomical object, celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall chronology of the Universe, evolution. Objects of interest include planets, natural satellite, moons, stars, nebulae, galaxy, galaxies, meteoroids, asteroids, 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 atmosphere of Earth, 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 Egyptian astronomy, Egyptians, Babylonian astronomy, Babylonians, Greek astronomy, Greeks, Indian astronomy, Indians, Ch ... [...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'' (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 numerical techniques, and contemporary discussions of the physical causes of the planets' motion. Laws of planetary motion Johannes Kepler was the first to closely integrate the predictive geometrical a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
