| Peder Horrebow | |
 Peder Horrebow | |
| Born | May 14, 1679 Løgstør, Jutland |
|---|---|
| Died | April 15, 1764 Copenhagen |
| Nationality |  Denmark |
| Fields | astronomy |
Peder [Nielsen] Horrebow (Horrebov) (May 14, 1679–April 15, 1764) was a Danish astronomer. Events 1264 - Battle of Lewes: Henry III of England is captured in France making Simon de Montfort the Løgstør is a town and a former municipality ( Danish, kommune) in Region Nordjylland on the Jutland peninsula in northern Denmark This article is about the region of Denmark. For the World War I naval battle see Battle of Jutland. Events 1450 - Battle of Formigny: Toward the end of the Hundred Years' War, the French attack and nearly annihilate English Year 1764 ( MDCCLXIV) was a Leap year starting on Sunday (link will display the full calendar of the Gregorian calendar (or a Copenhagen (ˌkəʊpənˈheɪgən ˌkəʊpənˈhɑːgən ˈkəʊpənˌheɪgən ˈkəʊpənˌhɑːgən kʰøb̥ənˈhɑʊ̯ˀn kʰøb̥m̩ˈhɑʊ̯ˀn is the capital and largest city The Kingdom of Denmark ( ˈd̥ænmɑɡ̊ (archaic ˈd̥anmɑːɡ̊ commonly known as Denmark, is a country in the Scandinavian region of northern Europe Astronomy (from the Greek words astron (ἄστρον "star" and nomos (νόμος "law" is the scientific study Events 1264 - Battle of Lewes: Henry III of England is captured in France making Simon de Montfort the Events 1450 - Battle of Formigny: Toward the end of the Hundred Years' War, the French attack and nearly annihilate English Year 1764 ( MDCCLXIV) was a Leap year starting on Sunday (link will display the full calendar of the Gregorian calendar (or a The Kingdom of Denmark ( ˈd̥ænmɑɡ̊ (archaic ˈd̥anmɑːɡ̊ commonly known as Denmark, is a country in the Scandinavian region of northern Europe Born in Løgstør, Jutland to a poor family of fishermen, Horrebow entered the University of Copenhagen in 1703. Løgstør is a town and a former municipality ( Danish, kommune) in Region Nordjylland on the Jutland peninsula in northern Denmark This article is about the region of Denmark. For the World War I naval battle see Battle of Jutland. The University of Copenhagen (Københavns Universitet is the oldest and largest University and research institution in Denmark. Year 1703 ( MDCCIII) was a Common year starting on Monday (link will display the full calendar of the Gregorian calendar (or a Common year He worked his way through grammar school and university by virtue of his technical knowledge: he repaired mechanical and musical instruments and cut seals. He received his MA from the university in 1716, and his MD in 1725. From 1703 to 1707, he served as an assistant to Ole Rømer and lived in Rømer's home. Ole Christensen Rømer (o(ːlə ˈʁœːˀmɐ in Danish 25 September 1644, Århus – 19 September 1710, Copenhagen) He worked as a household tutor from 1707 to 1711 to a Danish baron, and entered the governmental bureaucracy as an excise writer in 1711. Baron is a specific Title of nobility. The word baron comes from Old French baron, itself from Old High German and Latin (liber Excise or Excise tax (sometimes called an excise duty) is a type of Tax charged on goods produced within the country (as opposed to Customs duties
After repeatedly petitioning King Frederick IV, Horrebow became professor of mathematics at the University of Copenhagen in 1714. Frederick IV (11 October 1671 &ndash 12 October 1730 was the king of Denmark and Norway from 1699 until his death He also became director of the university's observatory (called the Rundetårn, "the Round Tower"). An observatory is a location used for observing terrestrial and/or celestial events Rundetårn (former spelling Rundetaarn, lit '' Round Tower) is a 17th century Tower located in Copenhagen, Denmark His son Christian succeeded him in this position (Horrebow had a total of 20 children). Christian Pedersen Horrebow (1718&ndash1776 was a Danish astronomer of the eighteenth century
In 1728, the great fire of Copenhagen destroyed all of the papers and observations made by Rømer, who had died in 1710. The Copenhagen Fire of 1728 was the largest Fire in the History of Copenhagen, Denmark. Horrebow wrote the Basis Astronomiae (1734-35), which describes the scientific achievements made by Rømer. Horrebow's own papers and instruments were destroyed in the same fire. Horrebow was given a special grant from the government to repair the observatory and instruments. Horrebow received further support from a wealthy patron.
Horrebow invented a way to determine a place's latitude from the stars. Latitude, usually denoted symbolically by the Greek letter phi ( Φ) gives the location of a place on Earth (or other planetary body north or south of the The method fixed latitude by observing differences of zenith distances of stars culminating within a short time of each other, and at nearly the same altitude, on opposite sides of the zenith. In broad terms the zenith is the direction pointing directly above a particular location ( Perpendicular, Orthogonal) The method was soon forgotten despite its value until it was rediscovered by the American Andrew Talcott in 1833. Andrew Talcott ( April 20, 1797 - April 22, 1890) was an American Civil engineer. It is now called the Horrebow-Talcott Method.
He wrote on navigation and determined the sun parallax, 9", an approximative solution to the Kepler equation. Navigation is the process of reading and controlling the movement of a craft or vehicle from one place to another Parallax is an apparent displacement or difference of orientation of an object viewed along two different lines of sight and is measured by the angle or semi-angle of inclination between Horrebow also learned how to correct inherent flaws in instruments. This preceded Tobias Mayer's theory of correction of 1756. Tobias Mayer ( 17 February 1723 &ndash 20 February 1762) was a German Astronomer famous for his studies of the Moon
Horrebow was a member of a number of scientific societies, including the Académie des Sciences (from 1746). The French Academy of Sciences ( French: Académie des sciences) is a Learned society, founded in 1666 by Louis XIV at the He also worked as a medical doctor and as an academic notary (from 1720).
He died in Copenhagen.
The Horrebow crater on the Moon is named after him. Horrebow is a lunar Impact crater that is located along the northern shore of Mare Frigoris, just to the south of the J
Sources
- (French) Imago Mundi: Peder Horrebow
- (English) The Galileo Project: Peder Horrebow
- (English) Astronomy in Denmark
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