This fresco with a sundial is located on a wall of the old university at the Max-Reinhard-Platz. It was created by Georg Jung (1899-1957). The depictions refer to the four faculties of that university which was founded by Prince Archbishop Paris von Lodron in 1622. [German]
The four faculties at that time were theology, philosophy, medicine and jurisprudence. Today the university is also known as Paris Lodron University of Salzburg.