The University of Copenhagen's astronomical observatory in Denmark, completed in 1861 on the site of abandoned seventeenth-century fortifications to replace the university's older, increasingly light-polluted observatory at the Rundetaarn tower, with a three-winged building designed by architect Christian Hansen. Director Heinrich Louis d'Arrest published a catalog of nearly 2,000 nebulae there, and director Bengt Stromgren made pioneering studies of stellar composition; the Central Bureau for Astronomical Telegrams operated from the site during the First World War until 1965. Active observation ended in the 1950s, when the university's astronomical work shifted to Brorfelde Observatory, and the historic building now houses the university's Institute for Science Didactics.
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