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Vienna Observatory is an Astronomical Observatory in Vienna , Austria . The first observatory was built in 1753 / 1754 on the roof of one of the building of the University Of Vienna . A new observatory was built between 1874 and 1879 , and was finally inaugurated by Emperor Franz Joseph I Of Austria in 1883 . The main dome houses a Refractor with a diameter of 68 centimeters and a focal length of 10.5 meters. At that time, this was the world's largest telescope. DIRECTORS
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