Ambrosiana
PORT ROYAL ET L'ITALIE
Annual international conference of the Society of Friends of Port-Royal is held, October 13-14 2023, Sala delle Accademie E.R. Galbiati.
Tradition has it that this armillary sphere, which is mounted on an elegantly engraved lobated support, originally belonged to Saint Charles Borromeo. It can be used to study the movement of the moon according not to the ancient Ptolemaic view but to the new Copernican system.