Celsiushuset, Former astronomical observatory in Uppsala, Sweden
Celsiushuset is a three-story stone building on Svartbäcksgatan that combines medieval architecture with eighteenth-century astronomical observatory modifications. The structure shows a blend of older construction elements and scientific requirements necessary for observing the sky.
Anders Celsius established Sweden's first university observatory in this building in 1738, transforming a medieval charitable institution into a center for astronomical research. This conversion marked the site's shift from religious to scientific purpose.
The building housed multiple student organizations, including the Södermanlands-Nerikes nation from 1855 to 1865, and served as a rehearsal and performance space for musical groups. It became an important gathering place for student life in the city.
The building now belongs to Uppsala University and contains the Centre for Environmental and Development Studies with commercial spaces on the ground floor. The facade is visible from the street, and its location makes it easy to locate while exploring the area.
Students named the building 'Oratio obliqua' because of its tilted position relative to Svartbäcksgatan street, reflecting its construction before the city's linear planning. This slant remains visible today and tells a story of Uppsala's urban development.
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