Baron Arthur Kraus was a renaissance man who, especially in astronomy, surpassed his time. The film summarises the impact of a visionary, a traveller, a populariser, a scientist, an athlete, and a pioneer of aviation. Born in Pardubice in 1912, Kraus opened the first public observatory in central Europe. In wartime, the scientist participated in the foundation of Czech Astronomical Society and created one of the oldest methods for observing the Sun. What did his lab look like and what was his contribution to sport?