Observed the cathedral lantern
· Pisa Cathedral, Piazza del Duomo, Pisa, Tuscany, Italy
Wikimedia Commons · Creative Commons Attribution-Share Alike 3.0 Unported · file According to his pupil and biographer Vincenzo Viviani, Galileo observed a swinging lamp in Pisa Cathedral, an episode later associated with his study of pendular motion. The event rests on Viviani's later account rather than a contemporary record.
