On the floor in front of the sanctuary is a meridian, which was installed by the astronomer Giuseppe Piazzi in 1801. It is a kind of sundial, with which Piazzi wanted to make the more modern day division based on the sunny day more popular than the traditional classification "all'italiana". The sun's light, which falls through a small opening in one of the domes in the aisle, always crosses an inlaid brass line at exactly 12 noon. By changing the position of the sun in the course of the year, the solstices, the equinox and the signs of the zodiac can be read, which is also of importance for the determination of the date of the Easter.
July 17, 2017
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