Sundial frescoed above the entrance to a house in the Aosta Valley. Flowers and edelweiss enrich the dial dedicated to our star (the sun).
The shadow of the golden sphere moving on the diagram indicates the true solar hours of the place and the complete astronomical calendar. By adding to the solar time indicated by the shadow of the sphere, the minutes of the graph at the bottom right, according to the observation date (the current month), the time of the time of the time zone is obtained, adding an extra hour when summer time is in effect in summer