In Ole Rømer's Footsteps is a family activity held at the Spiral Ramp of the Round Tower (Rundetaarn) in Copenhagen, Denmark. It invites children, and adults who like a good treasure hunt, to climb the winding ramp and look for celestial objects and astronomical instruments along the way.
What the visit involves
The ramp's windows are the focus of the search. Visitors look for the objects and collect stickers, and in doing so learn how the astronomer Ole Rømer found that light has a speed. The activity is included in the entry fee, so there is no separate cost to join in.
- Explore the winding Spiral Ramp and its windows
- Search for celestial objects and astronomical instruments
- Collect stickers that tell the story of Rømer's discovery
Timing and context
The activity runs during school holidays through the end of 2026 and forms part of Light Year 2026. The Round Tower is marking the 350th anniversary of Rømer's discovery this year, which gives the visit a clear theme.
Halfway up the tower, the Library Hall holds the exhibition Ole Rømer and the Great Discovery. A current special exhibition can also be explored, so the climb can be combined with a look at both displays.
Planning your visit
This suits families with children and anyone curious about the history of astronomy. Check the event page for the latest details before you go.