It will be possible this year again to observe the passage of sun's rays on the gnomon built by Paolo Dal Pozzo Toscanelli in the cathedral in 1475 and restored by a Jesuit priest named Leonardo Ximenes in 1754.
The event will be held from 12:30 to 13:30 and also take place even if the sky is overcast.
- June 11
- June 14
- June 18 (only in english)
- June 21
The event is promoted by the Opera di S.Maria del Fiore with the scientific coordination of the Comitato per la Divulgazione dell'Astronomia from the Museo and Istituto di Storia della Scienza e del Dipartimento di Astronomia e Scienza dello Spazio dell' Università degli Studi di Firenze.