Sundial in Calci (Pisa)
Latitude 43° 43' 39" N - Longitude 10° 31' 03" E
This equatorial sundial spreads over an area of about 30 square meters; its main characteristic is the planar surface for shadow projection, which is exactly perpendicular to the gnomon's style that is in the North direction. This plane is called equatorial, because it is parallel to the equator both of the Earth and of the celestial sphere. In Spring and Summer the gnomon casts its shadow onto the upper quadrant, in Autumn and Winter on the lower one; the transition takes place in the equinox days. On the quadrant there are seventeen hour points. In this particular sundial the structural elements have original shapes and colors, the gnomon is represented by a lightning bolt of steel darting from a set of overlapping clouds in the broader context of a blue sky with stars. The lightning bolt flexes dynamically towards the upper quadrant, that has a rainbow as background, pointing towards the center of a stylized Sun.
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