Located next to the stair of the Temple of Apollo, west from the Forum. The Romans had many types of sundials. The famous architect Vitruvius, on the 9th book of the De Architectura (‘The Ten Books of Architecture’) explains the many variations along with its inventors: in the image, we can see an example of an hemicyclium sundial invented, according to Vitruvius, by Berossus the Chaldean (De Arch. 9.8.1).
