The calculated distance (air line) between Rosignano Solvay-Castiglioncello and Bologna is approximately 89 miles respectively 142 kilometers.
By car or train, the actual journey to Bologna is certainly longer, as only the direct route (as the crow flies) between Rosignano Solvay-Castiglioncello and Bologna has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles