 Copernicus had strong ties to the city of Lidzbark, and had visited there at the invitation of his maternal uncle Bishop Lucas Watzenrode in 1495.Sikorski worked at the museum from 1961 to 1962.Lidzbark Warmiński Castle was of substantial significance for Jerzy Sikorski's "Copernicana" studies in terms of the history of astronomy; as well as because the castle was a strongly fortified seat of the bishops of Warmia and the administration center of their lands from the second half of the 14th century.