Sun Observation Sundays
Come by the Round Tower on Sundays during the summer holidays to observe the Sun and its fascinating details through the telescope in the Observatory at the top. It’s included in your admission.
Join us each Sunday from June 30th to August 11th as our astronomers operate the old telescope between 1-4PM. Look up into the skies yourself and take a closer look at the Sun and Sun Spots through a special lens while our astronomers guide you and answer questions about the heavenly bodies.
Please note: The Round Tower cannot control the weather. If the sky is overcast, our astronomers cannot guarantee visibility of the Sun.
Furthermore, we inform that there may be a waiting time to access the observatory.
Astro Bar x Art Matter: Culture and drinks in the Round Tower
Explore the current exhibition and enjoy a 360-degree sunset over Copenhagen with drinks and music at the Round Tower’s exclusive Thursday bar.
Walk up the Spiral Ramp hand in hand with a loved one, stop halfway at the Library Hall to explore the current exhibition and end your visit at the top of the Round Tower with drinks and music.
On May 22nd the tower will be exceptionally open in both the Library Hall and the rooftop, as we swap souvenirs and ice cream at the rooftop kiosk for beers and cocktails and invite you to Astro Bar – the city’s most scenic bar with an unbeatable view.
With your ticket you can explore the exhibition in the Library Hall, get assistance from astronomers to look through the telescope in the Observatory, and enjoy the sun setting over the city from the rooftop platform.
Since space is limited, tickets are available for pre-sale, but if capacity allows, you can also purchase tickets at the entrance.
Please note:
If the weather does not allow for an open-air event, we will move the gathering indoors.
Family Culture Night at the Round Tower
Calling all children interested in the Universe, stars and planets! On March 14, we are hosting Family Culture Night at the Round Tower, where all children (and their families) are invited to join fun activities in the Spiral Ramp, a planet workshop and stargazing in the Observatory.
Exploring the Tower and Creative Planet Workshop
In the Round Tower’s iconic Spiral Ramp, you can travel with light through the solar system and explore the planets. Along the way, you can solve small tasks and talk to the Round Tower’s astronomy students, who will teach you more about the movement of the solar system, the speed of light, and constellations.
In the Library Hall, you can discover Jakob Arthur Andersen’s captivating astrophotos, while in the old reading room, you have the opportunity to unleash your creativity and create your very own lifelike planets – both on paper and on sticks! The Round Tower provides colors, tools, and drawing kits, but you decide what patterns and colors the celestial bodies should have.
Visit the Observatory at the Top
The Observatory, located in the historic domed building at the top of the tower, will be open for visitors. Here, you will find the 95-year-old telescope, which the Round Tower’s astronomers will use to zoom in on celestial bodies many light-years away in the Milky Way. If we are lucky, both Jupiter and Mars will be visible in the sky that evening. Don’t forget to dress warmly!
Please note: There is limited space in the Observatory, so a queue may form. The Round Tower cannot guarantee that we will be able to see celestial objects through the telescope if, for example, the sky is cloudy. However, if the weather does not cooperate, the Observatory will still be open, and our astronomers will share fascinating insights about the Observatory and the large refracting telescope, which has a magnification range of 80-450 times.
This evening you can only access with a Culture Night Pass. A Culture Night Pass for Family Culture Night 2025 can only be purchased digitally via kulturnatten.dk. It costs DKK 125 and gives you access to all the events at Family Culture Night and allows you – free of charge – to take two children under 12 years old with you. In addition, the Culture Night Pass ensures for the Pass holder and for two children under 12 free transportation by bus, train and Metro in Greater Copenhagen zones 1-99.
KOSMOS – Astro Festival in the Round Tower
Between February 7 and March 21, Rundetaarn invites you to an astro festival in Christian IV’s stargazing tower on Købmagergade. Framed by an exhibition featuring spectacular photos by one of Denmark’s best astrophotographers, the program also includes scientific talks in Danish, concerts, special events, and other stellar moments for both children and adults.
Exhibition with Astrophotographer Jakob Arthur Andersen
February 7th – March 21st
Embark on a journey thousands of light-years into space as Jakob Arthur Andersen showcases his stunning images of the night sky and deep space in the Library Hall. With telescope and camera, he has spent countless hours capturing the wonders of our universe, the solar system, and the landscapes of the night. Experience his very best photographs—from the Milky Way to distant galaxies—at the Round Tower.
Visit the Observatory
Tuesdays and Wednesdays, 6–9PM
Join our astronomers for a night of star and planet 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 your entrance ticket.
Please Note: Stargazing is not possible if the sky is overcast. The Round Tower cannot guarantee visible stars or planets if the weather does not permit.
If it is cloudy or overcast, our astronomers will still keep the Observatory open for visits and will in stead tell you more about the telescope and the old Observatory.
Concert: Bremer/McCoy
March 3rd, 8PM
Listen to the sound of Cosmos when the meditative, dub-inspired jazz duo Bremer/McCoy offers their interpretation as they visit the Round Tower to perform tracks from their latest album, titled Kosmos after the wondrous universe.
Planet Workshop for Kids
February 16th, 10AM – 2PM
Color planets and create your own solar system at Rundetaarn’s creative drop-in workshop for children and their adults.
Spotlight on Women in Astronomy and Physics on International Women’s Day
Join us as we honor women in the world of science on March 8th in collaboration with Women in Physics (KIF).
The day will feature engaging talks and lectures, a meet and greet session, a book signing, mini concert and a workshop with a science community for young women.
Program for the Day
12:30
INTRODUCTION
Maren Malling and Cecilie Cold, chair and vice-chair of Kvinder i Fysik, will introduce Kvinder i Fysik and provide historical and contemporary perspectives on women in physics in Denmark.
13:10
TALK
Desiree Della Monica Ferreira, head of Astrophysics and Atmospheric Physics at DTU and 2024 KIF Prize winner, will talk about her work as a space researcher and the importance of female role models in science and technology.
14:00
BOOK SIGNING & MEET ‘N’ GREET
Anja C. Andersen is an astrophysicist and professor at the University of Copenhagen, known for her inspiring books, brilliant talks, and numerous appearances on podcasts and TV.
Here, you will have the opportunity to meet Anja and talk to her about astrophysics and her latest book, Det Gådefulde Univers. The book will be available for purchase at the event, or you can bring your own copy for signing.
You will also have the chance to meet Dot Pio, a graduate student in quantum physics at DTU and KU, where she researches quantum computing with superconducting technology. Besides her studies, she is passionate about sharing her love for physics, philosophy, and STEM on her Instagram platform @mindfulphysicist.
15:00
LECTURE
Bente Rosenbeck, gender researcher, historian, and professor emerita, will give a talk about the Danish astronomer Julie Vinter Hansen – a pioneering astronomical observer and researcher, and the first woman to be officially appointed at the University of Copenhagen after the 1921 law that granted both genders equal access to all public positions and offices.
15:30
WORKSHOP
After 25 years in the medical technology industry, Marianne Andersen founded the science community High5Girls in 2018 to show young girls and women the many opportunities within STEM (science, technology, engineering, and mathematics) and entrepreneurship.
Together with electrical engineer and High5Girls role model Anna Krzyzanowska, as well as three teenage girls, Victoria, Emmiline, and Sofia, Marianne will lead a hands-on workshop on printed electronics.
16:30
MINI CONCERT
Signe Heinfelt is a composer and sound artist with a degree in electronic music and sound art from the Danish National Academy of Music.
In a unique mini concert, she will explore music through electromagnetism, radio waves, and the visualization of sound waves. On stage, she will demonstrate both some of the oldest and newest inventions in music technology – including the theremin, one of the world’s first electronic instruments from 1919.
PLEASE NOTE: The event will be held in English.
Kvinder I Fysik – KIF (The Women in Physics Association) works to promote awareness of women in the field of physics. Their main goal is to inform, create visibility, and build networks so that young female physics aspirants feel welcomed into the world of science.
Planet Workshop for Kids
Color the planets and create your own Solar System when the Round Tower invites you to join a creative drop-in workshops for children and their adults.
Create unique and imaginative celestial bodies! Armed with scissors, glue, cotton balls and crayons, only imagination sets the limits.
The Round Tower provides tools and drawing kits, but you decide the patterns and colors of your celestial creations.
The workshop is open to all who have paid regular admission, though spaces are limited.
The event is part of the program for Round Tower’s astro festival “KOSMOS”.
Planet Workshop for Kids
Let your creativity run free and create your own planets or Solar system when the Round Tower invites you to a creative drop-in workshop for children.
Create unique and imaginative celestial bodies! Armed with scissors, glue, cotton balls and crayons, only imagination sets the limits.
The Round Tower provides tools and drawing kits, but you decide the patterns and colors of your celestial creations.
The workshop is open to all who have paid regular admission, though spaces are limited.
The event is part of the program for Round Tower’s astro festival “KOSMOS”.
Exhibition with Astrophotographer Jakob Arthur Andersen
Embark on a journey thousands of light-years into space as one of Denmark’s best astrophotographers presents his spectacular images in the Library Hall. Experience Jakob Arthur Andersen’s fascinating shots of the night sky and deep space – the Universe like you’ve never seen it before.
With a telescope and camera, Jakob Arthur Andersen has spent countless hours capturing our fantastic Universe, Solar System, and the landscapes of the night. The exhibition in the Library Hall showcases his finest images – from the Milky Way to distant galaxies.
Jakob Arthur Andersen’s works are a central part of the Round Tower’s astro festival “COSMOS”, which also features scientific talks, astronomy for children, and other stellar experiences – all with the cosmos in focus.
Science Meets Art
Astrophotography demands patience and precision. The process relies not only on technical skill but also on the clarity of the sky and the whims of the weather. Denmark’s climate often poses a challenge, which means that photos are frequently created over multiple nights. When the weather is favorable, you must act quickly—sometimes conditions are optimal for only a few hours at a time. On other nights, the sky can be cloudless and starry all night long.
Jakob’s images require long exposure times and are composed of many individual shots that enhance each other. He views digital editing as his palette and the camera as his brush—astrophotography, to him, is a unique fusion of science and art.
Place your bid
All the works in the exhibition are for sale, but as something special, you can bid on the five largest photographs, with the full amount going directly to Folkekirkens Nødhjælp (DanChurchAid). The auction is already underway and runs until March 21, when the exhibition’s finissage will take place.
Bids are anonymous and must be sent directly via message to Jakob Arthur Andersen on his Instagram account, @clearskyastrofoto.
At the finissage on March 21 from 4–7 PM, it will be possible to continue bidding, after which the winners of the five photographs will be announced. The highest bids secure the artworks.
The sale of other works takes place by contacting Jakob Arthur Andersen via email.
About Jakob Arthur Andersen
Astrophotographer and lecturer Jakob Arthur Andersen opens a window to infinity with his telescope and camera—a visual time machine reaching deep into the vast cosmos.
Jakob is a self-taught astrophotographer and internationally recognized; he has won several awards, including first place in the prestigious International Photography Awards for two consecutive years.
When he’s not observing the universe from his backyard on the island of Falster, he wanders through the quiet nighttime landscapes with his camera and tripod, always in search of new subjects under the night sky that stretches majestically over the dark Danish plains.
This event is part of the program for the Round Tower’s astro festival “COSMOS”.
Astro Evenings for Families
Join us during selected days in the autumn break for Astro Evenings for children and their adults, with special evening openings for families at the Observatory and a creative planet workshop.
Visit the Observatory
Remember to wear warm clothes when we open the Observatory especially for families and focus the telescope lens on Saturn or the Moon, weather permitting. There is limited space in the Observatory at any one time, so don’t forget to visit the planet workshop in the Reading Room, where you can create your own celestial bodies. You can also buy a cup of hot cocoa or other refreshments for children in the Library Hall.
Planet Workshop
Color the planets and create your own solar system when the Round Tower invites children and adults to a creative drop-in workshop. Try your hand at scissors, glue, cotton balls, and beautiful wax crayons that can be blended with water.
The Round Tower provides colors, tools, and drawing kits, but you decide the patterns and colors of the celestial bodies!
Note: The Round Tower cannot guarantee that we will be able to see celestial objects through the telescope if the weather does not allow it! However, if the weather doesn’t cooperate, we will still keep the Observatory open, and our astronomers will instead share more about the Observatory and the large refractor telescope, which can magnify 80-450 times.
Tickets include regular entry but must be booked in advance.
Astro Evenings for Families
Join us during selected days in the autumn break for Astro Evenings for children and their adults, with special evening openings for families at the Observatory and a creative planet workshop.
Visit the Observatory
Remember to wear warm clothes when we open the Observatory especially for families and focus the telescope lens on Saturn or the Moon, weather permitting. There is limited space in the Observatory at any one time, so don’t forget to visit the planet workshop in the Reading Room, where you can create your own celestial bodies. You can also buy a cup of hot cocoa or other refreshments for children in the Library Hall.
Planet Workshop
Color the planets and create your own solar system when the Round Tower invites children and adults to a creative drop-in workshop. Try your hand at scissors, glue, cotton balls, and beautiful wax crayons that can be blended with water.
The Round Tower provides colors, tools, and drawing kits, but you decide the patterns and colors of the celestial bodies!
Note: The Round Tower cannot guarantee that we will be able to see celestial objects through the telescope if the weather does not allow it! However, if the weather doesn’t cooperate, we will still keep the Observatory open, and our astronomers will instead share more about the Observatory and the large refractor telescope, which can magnify 80-450 times.
Tickets include regular entry but must be booked in advance.