Friedrich von Hahn
Encyclopedia
Friedrich II. Graf von Hahn (July 27, 1742 – October 9, 1805) was a German nobleman, a philosopher and astronomer.

Von Hahn was born in Neuhaus
Neuhaus
- Places :*in Germany:**in Bavaria:***Neuhaus an der Pegnitz, in the district Nürnberger Land***Neuhaus am Inn, in the district of Passau**in Lower Saxony:***Amt Neuhaus, in the district of Lüneburg***Neuhaus , in the district of Cuxhaven**in Thuringia:...

, Holstein
Holstein
Holstein is the region between the rivers Elbe and Eider. It is part of Schleswig-Holstein, the northernmost state of Germany....

. In 1793 he started the construction of a private observatory, the first in Mecklenburg, which was well equipped.
He owned some of the largest mirrors made by William Herschel
William Herschel
Sir Frederick William Herschel, KH, FRS, German: Friedrich Wilhelm Herschel was a German-born British astronomer, technical expert, and composer. Born in Hanover, Wilhelm first followed his father into the Military Band of Hanover, but emigrated to Britain at age 19...

 and precision instruments for determining the position of stars. In 1800, he discovered the central star in M57
Ring Nebula
The famously named "Ring Nebula" appears in the northern constellation of Lyra and is located in the Carina–Sagittarius Arm...

, the Ring Nebula
Ring Nebula
The famously named "Ring Nebula" appears in the northern constellation of Lyra and is located in the Carina–Sagittarius Arm...

 in the constellation Lyra
Lyra
Lyra is a small constellation. It is one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations recognized by the International Astronomical Union. Its principal star, Vega — a corner of the Summer Triangle — is one of the brightest...

.

He died in Remplin
Remplin
Remplin is a village and a former municipality in the Mecklenburgische Seenplatte district, in Mecklenburg-Vorpommern, Germany. Since 7 June 2009, it is part of the municipality Malchin....

, Mecklenburg
Mecklenburg
Mecklenburg is a historical region in northern Germany comprising the western and larger part of the federal-state Mecklenburg-Vorpommern...

. After his death, his son, the "theatrical count" and father of author Ida, Countess von Hahn-Hahn
Ida, Countess von Hahn-Hahn
Countess Ida von Hahn-Hahn was a German author.-Biography:She was born at Tressow, in the duchy of Mecklenburg-Schwerin. She was the daughter of Carl Friedrich Graf von Hahn , who was well known for his enthusiasm for stage productions, upon which he squandered a large portion of his fortune...

, squandered his fortune and all books and instruments were sold. The best instruments were bought by Friedrich Wilhelm Bessel for the new observatory in Königsberg
Königsberg
Königsberg was the capital of East Prussia from the Late Middle Ages until 1945 as well as the northernmost and easternmost German city with 286,666 inhabitants . Due to the multicultural society in and around the city, there are several local names for it...

. One instrument is on display in the Deutsches Museum
Deutsches Museum
The Deutsches Museum in Munich, Germany, is the world's largest museum of technology and science, with approximately 1.5 million visitors per year and about 28,000 exhibited objects from 50 fields of science and technology. The museum was founded on June 28, 1903, at a meeting of the Association...

 in Munich.

He is honoured together with Otto Hahn
Otto Hahn
Otto Hahn FRS was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". Hahn was a courageous opposer of Jewish persecution by the Nazis and after World War II he became a passionate campaigner...

 by the lunar crater Hahn
Hahn (crater)
Hahn is a lunar impact crater that is located near the northeastern limb of the Moon. The crater appears oval when viewed from the Earth due to foreshortening. It is located less than one crater diameter to the southeast of Berosus, a slightly smaller formation.The inner wall of Hahn contains a...

.

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