The Prime Meridian ran through the north tower of Bratislava Castle, Banská Bystrica, Štiavnica and Vojnice.
It was surveyed by Samuel Mikovíni when Emperor Charles VI commissioned him to draw maps of the counties of the Kingdom of Hungary. Mikovíni drew on what he had learned while studying geodesy and land surveying in Jena. The Štiavnica meridian crosses the upper courtyard of the Kammerhof, where it is marked by a stone on the balustrade of the Renaissance arcade, inside the ‘Mining in Slovakia’ exhibition.
