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the sundial-in front of museo di storia della scienza
Conceived as a "mathematical ornament" for the Institute and Museum of the History of Science, the sundial indicates true solar time for the place where it is located. The shadow cast by the glass globe atop the large bronze gnomon indicates the date and time. The hours from 9:00am to 2:00pm are marked out by radial brass lines while the date is indicated by the travertine traversal lines which signal the Sunís diurnal course for various periods of the year Ė precisely when the star enters the signs of the Zodiac. The shadow cast by the gnomon changes in length during the course of the days and seasons, and indicates a different time than that of our wristwatches. In respect to true solar time, mean time indicated by our wristwatches has a periodic variation that during the course of a year can exceed a quarter of an hour.
http://www.museogalileo.it/en/visit/location/epalazzocastellani/sundial.html

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