In the very center of Copenhagen is the Round Tower - one of the world’s oldest working observatories.
During our recent trip to Denmark, we climbed the spiral ramp and stairs 38.4 m to the platform and viewed the city. Built between 1637 and 1642, the Round Tower has been used for astronomy until the present day.
Point Zero. The hollow core of the tower was originally used for viewing stars.
The sun is usually the object viewed when the observatory is open to the public during the day, but cloud cover made even seeing the sun not possible, so the telescope was pointed at a clock tower.
The Library Hall halfway up the tower had an exhibit of Danish architecture.