University of Tartu Old Observatory

University of Tartu Old Observatory or Tartu Old Observatory (Estonian: Tartu Tähetorn) is an observatory in Tartu, Estonia. Tartu Observatory was an active observatory from 1810 to 1964. The building now serves as a museum and belongs to the University of Tartu Museum.

As first measurement point of Struve Geodetic Arc it is enlisted as a UNESCO World Heritage Site. Due to its significance in the history of astronomy, it has been declared an Outstanding Astronomical Heritage by the International Astronomical Union. It is registered as a National Cultural Monument of Estonia.

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