Context: The National Observatory of Athens (NOA) is a research institute in Athens, Greece. Founded in 1842, it is the oldest research foundation in Greece, as it was the first scientific research institute built after Greece became independent in 1829, and one of the oldest research institutes in Southern Europe., Aigio, also written as "Aeghion, Aegion, Aegio, Egio", is a town and a former municipality in Achaea, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Aigialeia, of which it is the seat and a municipal unit. The municipal unit has an area of 151.101 km. Its population is around 26,000. Aigio is a port town on the Gulf of Corinth., Erymanthos (Latin: "Erymanthus", also Olonos ()) is a mountain range in the southern part of Achaea and the northeastern part of Elis. With an elevation of 2,224 meters, it is the fourth-tallest mountain in the Peloponnese peninsula. The summit is located on the boundary of Achaea and Elis. Historically, Mount Erymanthos was part of northwestern Arcadia, where it was the second-tallest mountain range. The northern portion belonged to the historic Achaea., Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits. Yet the non-oceanic borders of Europea concept dating back to classical antiquityare arbitrary. The primarily physiographic term "continent" as applied to Europe also incorporates cultural and political elements whose discontinuities are not always reflected by the continent's current overland boundaries., Achaea or Achaia, sometimes transliterated from Greek as Akhaïa ("Achaïa"), is one of the regional units of Greece. It is part of the region of West Greece and is situated in the northwestern part of the Peloponnese peninsula. The capital is Patras. Since 2001, the population has exceeded 300,000., Athens ("Athína" ) is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, with its recorded history spanning over 3,400 years, and its earliest human presence starting somewhere between the 11th and 7th millennia BC. Classical Athens was a powerful city-state that emerged in conjunction with the seagoing development of the port of Piraeus, which had been a distinct city prior to its 5th century BC incorporation with Athens. A centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, it is widely referred to as the cradle of Western civilization and the birthplace of democracy, largely because of its cultural and political impact on the European continent, and in particular the Romans. In modern times, Athens is a large cosmopolitan metropolis and central to economic, financial, industrial, maritime, political and cultural life in Greece. In 2015, Athens was ranked the world's 29th richest city by purchasing power and the 67th most expensive in a UBS study., Göttingen (; Low German: "Chöttingen") is a university city in Lower Saxony, Germany. It is the capital of the district of Göttingen. The River Leine runs through the town. In 2011 the population was 116,052., Kalavryta is a town and a municipality in the mountainous east-central part of the regional unit of Achaea, Greece. The town is located on the right bank of the river Vouraikos, south of Aigio, southeast of Patras and northwest of Tripoli. Notable mountains in the municipality are Mount Erymanthos in the west and Aroania or Chelmos in the southeast. Kalavryta is the southern terminus of the Diakopto-Kalavryta rack railway, built by Italian engineers between 1885 and 1895., The Vouraikos is a river in Achaea, Greece. In ancient times it was called Erasinos. Its source is in the Aroania mountains, near the village of Priolithos. It flows past the towns of Kalavryta and Diakopto, and flows into the Gulf of Corinth near Diakopto. Its length is 40 km. The name is derived from Boura, a mythological daughter of Ion and Helice who was beloved by Hercules, who according to legend opened the gorge in order to get close to her. This is the Vouraikos gorge, which has a length of about 20 km. In the gorge the river passes through dense vegetation and tunnels with many caves, passes and crags., Southern Europe is the southern region of the European continent. Most definitions of Southern Europe, also known as Mediterranean Europe, include the countries of the Iberian peninsula (Spain and Portugal), the Italian peninsula, Southern France, Greece and Malta. Other definitions sometimes include the Balkan countries of Southeast Europe, which are geographically technically in the southern part of Europe, but which have different historical, political, economic, and cultural backgrounds that commonly places them in the category of Eastern Europe., Oberkochen is a town (officially a city, despite its size) in the Ostalbkreis, in Baden-Württemberg, in Germany, central Europe., Patras (, Classical Greek and Katharevousa:  , ) is Greece's third-largest city and the regional capital of Western Greece, in the northern Peloponnese, west of Athens. The city is built at the foothills of Mount Panachaikon, overlooking the Gulf of Patras., Thessaloniki is the second-largest city in Greece and the capital of Greek Macedonia, the administrative region of Central Macedonia and the Decentralized Administration of Macedonia and Thrace. Its nickname is   ("Symprotévousa"), literally "the co-capital", a reference to its historical status as the  ("Symvasilévousa") or "co-reigning" city of the Eastern Roman (Byzantine) Empire, alongside Constantinople., The euro (sign: €; code: EUR) is the official currency of the eurozone, which consists of 19 of the member states of the European Union: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain. The currency is also officially used by the institutions of the European Union and four other European countries, as well as unilaterally by two others, and is consequently used daily by some 337 million Europeans . Outside of Europe, a number of overseas territories of EU members also use the euro as their currency., The New Greek Telescope project of the National Observatory of Athens (NOA) was funded by the European Commission and the General Secretariat for Research and Technology of the Hellenic Ministry of Development. The telescope had its first light test in 2005, and became the largest telescope in Greece when it became fully operational at the Chelmos Observatory site in 2007. The telescope has a Ritchey-Chrétien configuration with a primary mirror with a diameter of 2.3 m. The mount is of the altazimuth kind. The telescope is operated by the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS) of the NOA., The Chelmos Observatory ( Greek :   ) is an observatory located at the top of mount Chelmos , near Kalavryta , southern Greece . It is the largest research infrastructure of the National Observatory of Athens . The observatory was completed and first opened in 2001 . Its main equipment is the Aristarchos 2.3 m Telescope , manufactured by German company Carl Zeiss AG. With the finance from the universities of Patras and Manchester ., Greece (' ), officially the Hellenic Republic (Greek: ' ), historically also known as Hellas ("" ), is a country in southeastern Europe. 
Greece's population is approximately 10.955 million as of 2015. Athens is the nation's capital and largest city, followed by Thessaloniki., Munich (also in British English ) is the capital and largest city of the German state of Bavaria, on the banks of River Isar north of the Bavarian Alps. Munich is the third largest city in Germany, after Berlin and Hamburg, and the 12th biggest city of the European Union, with a population of above 1.5 million. The Munich Metropolitan Region is home to 5.8 million people., Carl Zeiss is a German manufacturer of optical systems, industrial measurements and medical devices, founded in Jena, Germany in 1846 by optician Carl Zeiss. Together with Ernst Abbe (joined 1866) and Otto Schott (joined 1884) they built a base for modern optics and manufacturing. There are currently two parts of the company, Carl Zeiss AG located in Oberkochen with important subsidiaries in Aalen, Göttingen and Munich, and Carl Zeiss GmbH located in Jena., Aroania is a village and a former municipality in Achaea, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Kalavryta, of which it is a municipal unit. The municipal unit has an area of 173.804 km. The population is 1,619 (2011 census). The seat of administration was in the town Psofida. The municipality is named after the village and the mountain., Carl Zeiss (11 September 1816  3 December 1888) was a German maker of optical instruments best known for the company he founded, "Carl Zeiss Jena" (now: "Carl Zeiss AG"). Zeiss made contributions to lens manufacturing that have aided the modern production of lenses. Raised in Weimar, Germany, he opened a lens-making workshop in the 1840s in the city of Jena. At first his lenses were only used in the production of microscopes, but when cameras were invented, his company began manufacturing high-quality lenses for cameras., Subject: chelmos observatory, Relation: located_on_terrain_feature, Options: (A) arctic ocean (B) aroania (C) athens (D) belgium (E) caucasus mountains (F) cyprus (G) eastern europe (H) estonia (I) eurasia (J) europe (K) france (L) germany (M) greece (N) iberian peninsula (O) isar (P) lower saxony (Q) peloponnese (R) portugal (S) southeast europe (T) southern europe
Output: aroania