Gnomon of Saint-Sulpice

Gentilly, France

Gnomon of Saint-Sulpice

The Gnomon of Saint-Sulpice is an astronomical measurement device located in the Church of Saint-Sulpice (脡glise Saint-Sulpice) in Paris, France. It is a gnomon, a device designed to cast a shadow on the ground in order to determine the position of the sun in the sky. In early modern times, other gnomons were also built in several Italian and French churches in order to better calculate astronomical events. Those churches are Santa Maria del Fiore in Florence, San Petronio in Bologna, and the Church of the Certosa in Rome. These gnomons ultimately fell into disuse with the advent of powerful telescopes.

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