- Piazza del Popolo
- 48.43/68.82 metre(s)
- Italy (San Giovanni in Persiceto (BO))
The largest sundial is in the Piazza del Popolo (Italy), with a gnomon height of 48.43 m (158.89 ft) and a base diameter of 68.82 m (225.78 ft), in San Giovanni, Persicetoin, Bologna, Italy, as verified on 8 October 2022.
The shadow of the sundial is cast by the bell tower of the church and is projected onto the public square below.