Sundial for Cagliari, Italy. Wall facing south-west-ish (30 degrees from south towards west) and not vertical (60 degrees, instead of 90). You can see the Italic hours in green (sunset is the horizontal one, and then we have -1, -2, .., -6) and Babylonian hours in blue. The analemma is set on the UTC+1 meridian. A red dashed line gives the measure for a vertical gnomon to be placed at the center of the disk (marked by an x).
Obtained with
wall_incl = 60
wall_decl = -30
Equatorial sundial for Cagliari, Italy. Obtained with
wall_incl = 90 - %(lat)s
wall_decl = 180
That's the side of the disk facing up, which is illuminated in spring and summer. To get the other side, which is illuminated in autumn and winter, use
wall_incl = 90 + %(lat)s
wall_decl = 0
Polar sundial for Cagliari, Italy, facing south. Obtained with
wall_incl = %(lat)s
wall_decl = 0
Horizontal sundial for Perth, Australia. Obtained with
wall_incl = 0
wall_decl = 180
Vertical sundial for Perth, Australia. Wall facing north. Obtained with
wall_incl = 90
wall_decl = 180