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.
The four faculties at that time were theology, philosophy, medicine and jurisprudence. Today the university is also known as Paris Lodron University of Salzburg.