Christian Sørensen Longomontanus (or Longberg) (October 4, 1562 – October 8, 1647), was a Danish astronomer. October 4 is the 277th day of the year (278th in Leap years). ... Events Earliest English slave-trading expedition under John Hawkins. ... October 8 is the 281st day of the year (282nd in leap years). ... Events March 14 - Thirty Years War: Bavaria, Cologne, France and Sweden sign the Truce of Ulm. ... The Kingdom of Denmark is geographically the smallest Nordic country and is part of the European Union. ... Wikipedia does not yet have an article with this exact name. ...

The name Longomontanus was a Latinized form of the name of the village of Longberg, Jutland, Denmark, where he was born. His father, a laborer called Søren, or Severin, died when he was eight years old. An uncle took charge of the child, and had him educated at Lemvig; but after three years sent him back to his mother, who needed his help to work the fields. She agreed that he could study during the winter months with the clergyman of the parish; this arrangement continued until 1577, when the ill-will of some of his relatives and his own desire for knowledge caused him to run away to Viborg. Latin - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ... Jutland Peninsula Jutland (Danish: Jylland, German: Jütland) is a peninsula in northern Europe that forms the continental part of Denmark and a northern part of Germany, dividing the North Sea from the Baltic Sea. ... The Kingdom of Denmark is geographically the smallest Nordic country and is part of the European Union. ... Lemvig is a municipality and town in the west of Denmark, in the county of Ringkøbing on the peninsula of Jutland. ... Events The church in San Pedro in the Atacama Desert in Chile was built. ... Viborg is a town located in Jutland, Denmark. ...

There he attended the grammar school, working as a labourer to pay his expenses, and in 1588 went to Copenhagen with a high reputation for learning and ability. Engaged by Tycho Brahe in 1589 as his assistant in his great astronomical observatory of Uraniborg, he rendered invaluable service for eight years. Having left the island of Hven with his master, he obtained his discharge at Copenhagen on June 1, 1597, in order to study at some German universities. He rejoined Tycho at Prague in January 1600, and having completed the Tychonic lunar theory, turned homeward again in August. A grammar school is a type of school found in some English-speaking countries. ... Events May 12 - Day of the Barricades in Paris. ... City nickname: none Location in Denmark Area  - Total  - Water 526 km² xxx km² xx% Population  - City ( 2004)  - Metropolitan  - Density 502,204 1,116,979 954/km² [including water] xxx/km² [land only] Time zone Eastern: UTC+1 Latitude Longitude 55°43 N 12°34 W Copenhagen ( Danish: København) is... Tycho Brahe (December 14, 1546 Knudstrup, Denmark – October 24, 1601 Prague, Bohemia (now Czech Republic)) was a Danish nobleman, well known as an astronomer/astrologer (the two were not yet distinct) and alchemist. ... Events Rebellion of the Catholic League against King Henry III of France, in revenge for his murder of Duke Henry of Guise. ... Uraniborg was the astronomical/astrological observatory of Tycho Brahe; built circa 1576-1580 on Hven (also known as Ven or Hveen), an island in the Öresund; between Zealand and Scania. ... Hven, or Ven, is a small Swedish island in the Öresund strait, between Scania and Zealand. ... June 1 is the 152nd day of the year in the Gregorian calendar (153rd in leap years), with 213 days remaining. ... Events January 24 - Battle of Turnhout. ... Prague (Praha in Czech) is the capital and largest city of the Czech Republic. ... Events January January 1 - Scotland adopts January 1st as being New Years Day February February 17 - Giordano Bruno burned in a stake for heresy July July 2 - Battle of Nieuwpoort: Dutch forces under Maurice of Nassau defeat Spanish forces under Archduke Albert in a battle on the coastal dunes. ...

He visited Frauenburg, where Copernicus had made his observations, took a masters degree at Rostock, and at Copenhagen found a patron in Christian Friis, chancellor of Denmark, who employed him in his household. Appointed in 1603 rector of the school of Viborg, he was elected two years later to a professorship in the University of Copenhagen, and his promotion to the chair of mathematics ensued in 1607. This post he held till his death. Nicolaus Copernicus (in Latin; Polish Mikołaj Kopernik, German Nikolaus Kopernikus - February 19, 1473 – May 24, 1543) was a Polish astronomer, mathematician and economist who developed a heliocentric (Sun-centered) theory of the solar system in a form detailed enough to make it scientifically useful. ... The University of Rostock (German: Universität Rostock) is a university in northern Germany, located in the city of Rostock in the state of Mecklenburg-Western Pomerania. ... University of Copenhagen The University of Copenhagen (Danish: Københavns Universitet) is the oldest and largest university and research institution in Copenhagen, Denmark. ... Mathematics, often abbreviated maths in Commonwealth English and math in American English, is the study of abstraction. ... Events January 20 - Tidal wave swept along the Bristol Channel, killing 2000 people. ...

Longomontanus was not an advanced thinker. He adhered to Tycho's erroneous views about refraction, believed that comets were messengers of evil, and imagined that he had squared the circle. He found that the circle whose diameter is 43 has for its circumference the square root of 18252 which gives 3.14185 ... for the value of π. John Pell and others tried in vain to convince him of his error. He inaugurated, at Copenhagen in 1632, the erection of a stately astronomical tower, but did not live to witness its completion. King Christian IV of Denmark, to whom he dedicated his Astronomia Danica, an exposition of the Tychonic system of the world, conferred upon him the canonry of Lunden in Schleswig. This article refers to refraction in waves. ... Comet Hale-Bopp, showing a white dust tail and blue gas tail (February 1997) Comet (disambiguation). ... Squaring the circle is the impossible task of using ruler-and-compass constructions to make a square with the same area as a given circle. ... John Pell (March 1, 1610 - December 12, 1685), was an English mathematician. ... An image of Christian IV. Christian IV (1577–1648), king of Denmark and Norway, the son of Frederick II, king of Denmark and Norway, and Sophia of Mecklenburg, was born at Frederiksborg castle in 1577, and succeeded to the throne on the death of his father (April 4, 1588), attaining... This article is about the region of Schleswig on the German/Danish border. ...

His major works in mathematics and astronomy were:

• Systemalis Mathematici, etc. (1611)
• Cyclometria e Lunulis reciproce demonstrata, etc. (1612)
• Disputatio de Eclipsibus (1616)
• Astronomia Danica, etc. (1622)
• Disputationes quatuor Astrologicae (1622)
• Pentas Problematum Philosophae (1623)
• De Chronoiabio Historico, seu de Tempore Dispulatsones tres (1627)
• Geometriae quaesita XIII. de Cyclometria rabionali et vera (1631)
• Inventio Quadraturae Circuli (1634)
• Disputatio de Matheseos Indole (1636)
• Coronis Problematica ex Mysteriis trium Numerorum (1637)
• Problemata duo Goemetrica (1638)
• Problema contra Paulum Guidinum de Circuli Mensura (1638)
• Introductio in Theatrum Astronomicum (1639)
• Rotundi in Piano, etc. (1644)
• Admiranda Operatio trium Numerorum 6, 7, 8, etc. (1645)
• Caput tertium Libri primi de absoluta Mensura Rotundi plani, etc. (1646)

References

• This article incorporates text from the public domain 1911 Encyclopædia Britannica.