Hoher List Observatorium is an Observatory located on the Hoher List mountain (549 m ASL) about 60 km south-west of the city of Bonn, close to the town of Daun in the Eifel region (Rhineland-Palatinate) History The observatory of Bonn was founded by Friedrich Wilhelm August Argelander (1799 - 1875). His friendship to Prussian king Friedrich Wilhelm IV facilitated the deployment of the observatory in the years 1840 to 1844 by architect Karl Friedrich Schinkel. Argelander came to esteem in astronomy through his famous Bonner Durchmusterung, which resulted in a star catalogue containing 325.000 stars. Astronomical observations were carried out at the old Bonn Observatory until the 50’s of last century. However, the steady brightening of the night sky over the city by the light pollution (street lights, illumination of buildings) rendered observations more and more difficult. Hence, the then director of Bonn Observatory, Friedrich Becker (in German), saw the importance to find a location sufficiently distant from any artificial lights on the one hand, but sufficiently close to the institute at Bonn to ensure a close connection of students and staff of Bonn astronomy. An alternative site was successfully searched for in 1949 with the help by a botanist who worked in the Eifel area and was interested in astronomy. In a conversation with the then assistant astronomer Hans Schmidt (in German),Becker’s successor, the top of the Hoher List mountain above the village of Schalkenmehren was identified as a good site for astronomical observations. This rural environment was featured by a dark night sky, unasffected by artificial sky brightening. It was decided to deploy the observatory there and transfer the telescopes from the location in Bonn to this mountain range. In 1954 the new "Observatorium Hoher List" was inaugurated, with its first dome hosting a Schmidt telescope with a 50-cm mirror. A major extension in 1964 implied the transfer of the double refractor (in German) built in 1899 from Bonn to the Eifel. The last dome of the observatory was constructed in 1966 errichtet, and a 1-m Cassegrain telescope was inserted, now the largest and most modern telescope at Hoher List. Since its deployment the observatory has been an outpost of Bonn Observatory (since 2006: Observatory Department of the Argelander Institute for Astronomy of the University of Bonn), where many students have obtained their diploma or doctoral degree, and where many important scientific projects in the field of astrometry