Bologna and San Petronio. From the Julian calendar to the Gregorian calendar
Conversation between history, theology and astronomy 4 October 2017
Centro San Domenico - Sala della Traslazione, Piazza San Domenico 13, Bologna
04 Oct 2017 - 04 Oct 2017
In 1582 Pope Gregory XII – born in Bologna with the name Ugo Boncompagni – implemented a calendar reform based on the studies of Nicolaus Copernicus.
To realign the spring equinox with March 21, ten days had to be removed. Preserving the traditions of his family of origin, the Pope allowed the people of Bologna to celebrate the patron saint and Thursday 4 October was followed by Friday 15 October.
Bologna and San Petronio
- Wednesday 4 October 2017 at 15:30
A reflection that brings Bologna back to the centre of history with **Father Gabriele Gionti S.J.** of the Vatican Observatory, **Massimo Mazzoni** researcher from the University of Florence and **Giovanni Paltrinieri** gnomonics expert.
