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The "meridien" line materialized by a brass inlay in the pavement of this church is part of a scientific instrument built here during the 18th century. This was done in full agreement with Church authorities by the astronomers in charge of the newly-built Paris Observatory. They used it for defining various parameters of the earth's orbit. Similar arrangements have been made, for the sake of convenience, in other large churches like the Bologna cathedral, where Pope Gregory XIII had preparatory studies made for the enactment of the present, "Gregorian" calendar. Contrary to fanciful allegations in a recent bestselling novel, this is not the vestige of a pagan temple. No such temple ever existed in this place. It was never called a "Rose Line." It does not coincide with the meridian traced through the middle of the Paris Observatory which serves as a reference for maps where longitudes are measured in degrees East or West of Paris. No mystical notion can be derived from this instrument of astronomy except to acknowledge that God the Creator is the master of time. Please also note that the letters "P" and "S" in the small round windows at both ends of the transept refer to Peter and Sulpice, the patron saints of the church, not an imaginary "Priory of Sion." Source:http://www.sacred-destinations.com/france/paris-st-sulpice.htm
In 1727 Languet de Gergy, then priest of Saint-Sulpice, requested the construction of a gnomon in the church as part of its new construction, to help him determine the time of the equinoxes and hence of Easter .[6] A meridian line of brass was inlaid across the floor and ascending a white marble obelisk, nearly eleven meters high, at the top of which is a sphere surmounted by a cross. The obelisk is dated 1743. In the south transept window a small opening with a lens was set up, so that a ray of sunlight shines onto the brass line. At noon on the winter solstice (December 21), the ray of light touches the brass line on the obelisk. At noon on the equinoxes (March 21 and September 21), the ray touches an oval plate of copper in the floor near the altar. Constructed by the English clock-maker and astronomer Henry Sully, the gnomon was also used for various scientific measurements: This rational use may have protected Saint-Sulpice from being destroyed during the French Revolution. Source:www.wikipedia.org
Part I of the Gnomon of the Church of the Saint-Sulpice
The obelisk of the gnomon surmounted by a Cross of Christ and the pedestal where two verses of a psalm inscribed Source Book "The Gnomon of the Church of Saint-Sulpice (foto):http://www.ukstudentlife.com/Britain/Films/DaVinciCode/SaintSulpiceGnomon.jpg
