Sundial in Merano, Italy

Sundial in Merano, Italy

On the 9th day of my InterRail trip I walked through Merano in Italy and came across this sundial. I was impressed how many elements and codes are compiled in this depiction. For example one can see the motto of Friedrich III. (AEIOU) as well as a skull with an hour glass on top of it. Which remarkable elements do you see in this sundial?