Open today 10-18
The Round Tower by night

Star Gazing from Above

Join our amateur astronomers for a night of star gazing. During the winter months, the Observatory is open and manned every Tuesday and Wednesday evening from 18 to 21. No reservation is needed. The visit is included in the normal entrance ticket.

Used by the University of Copenhagen until 1861, the Round Tower is Europe’s oldest functioning observatory. It is now regularly used by amateur astronomers and open to the public all year round.

On top of the Round Tower there has been several different observatory buildings. The latest one dates from 1929. The Observatory is 6.75 metres high and 6 metres in diameter and contains a refracting telescope with 80–450 x magnification.




Observatoriet på toppen af Rundetaarn

Sun Observations Sundays during Summer Season

The Observatory is open every day during opening hours, where visitors can see the telescope inside the platform building.

Summer Holidays: The Observatory is manned and the telescope operated Sundays 1-4pm from June 26th to August 7th. We are looking at the Sun through a special lense. The visit to the Observatory is included in the ticket fee.