Museo della Civiltà Contadina del
Imperiale (Sundials courtyard)
Photo n° 4
The solar calendar is
made up of 19 lines which subdivide the solar year (365,2422
days) in 18 parts, about one every 10 days. The day during which
the reading is carried out matches the point on the quadrant hit
by the luminous spot created by the sun-shaped disc.