Completed AD 123/Dia Dome 142 ft, Hag Soph 102 ft, Capitol DC, 96 ft/ Base of dome 23 ft thick, at oculus, 2 ft thick/Pantheon, Rome cross-section showing spherical design/APR 29, 2002
The engineering of the roof of the Pantheon. 360. Key is sequence of the buttresses seen in profile and from air. Even more info than ribbing, this is a buttress turned 360. Dome =arch swung 360