Tycho Brahe has never set foot in the Round Tower, which was not finished until long after the world-famous Danish astronomer had died in exile in Prague. Yet there is a direct line from Tycho Brahe to the Observatory at the top of the tower.

For nearly 200 years, the Round Tower figured on the front cover of the University of Copenhagen's almanac as a as a token of the university vouching for the authenticity of the content. But you should not believe everything you read.

The British bombardment of Copenhagen in 1807 was not just a catastrophe for the city. The rain of bombs, grenades and rockets also led to what has been called the world's first example of rocket-based astronomy - with the Round Tower in an important role.

From 1751 onwards, astronomers made daily systematic observations of the weather at the top of the Round Tower. They did it for the first time in Denmark and had a very specific purpose. For what if you could predict rain, snow, lightning and thunder for years to come?

The Danish Astronomer G. F. Ursin disliked the Greenlanders thinking of the Sun as a Greenlandic woman and the Moon as a Greenlandic man. But he himself had no problems imagining life in space.