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Jena (German pronunciation: [ˈjeːna]) is a university city in central Germany on the river Saale. With a population of 103,000 it is the second largest city in the federal state of Thuringia, after Erfurt.At the end of the 19th century, with the building of the railway-line Saalbahn (along the river Saale) from Halle/Leipzig to Nürnberg, Jena became a center for precision machinery, optics and glass making, with the formation of the world famous companies Carl Zeiss Jena and Schott Jenaer Glaswerk, by Carl Zeiss, Ernst Abbe and Otto Schott.
Today Jena is a manufacturing city, specializing in precision machinery, pharmaceuticals, optics and photographic equipment, and is home to the famous Zeiss optics plant. In 1926, the world's first modern planetarium was built by the Zeiss company in the Damenviertel district of the town.
Jena - Wikipedia
