AbstractThis essay reviews an exhibition in the National Technical Museum, Prague, from 30 September to 23 October 1994 to mark the visit of Queen Margarethe II of Denmark to the Czech Republic on 11–13 October 1994Get full access to this articleView all access options for this article.Get accessReferences1. Folta J. : personal communication, October 1994.2. Kølln H. : Tycho Brahe v Praze’; 1994, Prague.3. Koyré A. : ‘The astronomical revolution’, (trans. Madisson R. E. W. ); 1973, London, Methuen.4. Thoren V. E. : ‘The Lord of Uraniborg’; 1990, Cambridge, Cambridge University Press.