Fancy a little physics lesson with an easy-to-observe demonstration? The Foucault pendulum lets youwitness in real timethe Earth's rotation, as demonstrated by a gyroscope, a device rotating around an axis in a constant direction. How does it work? If, as the hours go by, a pendulum's oscillation deviates from its trajectory, it's the point of attachment that's moving, not the object, or even the monument - so it must be the Earth! Invented by French physicist Léon Foucault, this revolutionary device was born in the 19th century, with the very first public demonstration taking place in Paris in 1851.
And so we can enjoy this incredible proof of our planet's movement, in two Parisian locations. The first is the Panthéon! A superb mausoleum on Mont Sainte-Geneviève, it houses hundreds of tombs of illustrious figures who have shaped France, as well as Foucault's first pendulum, courtesy of Louis Napoléon Bonaparte! Clinging to its vault, the pendulum swings constantly, but we almost missed out on this experience, as it was halted by the coup d'état of 1851! Fortunately, fifty years later, the founder of the Société Astronomique de France put the pendulum back in place, in 1995.
To carry out the experiment, a 67-meter-long steel wire is combined with a 28-kilo brass and lead sphere. Such a visual achievement that it is reproduced in many places and countries around the world, in Germany, Canada, Japan and many others. The second in the capital is at the Musée des Arts et Métiers, but the pendulum fell over in an accident in 2010. Today, the dented sphere is displayed in a showcase and a copy is installed in its place, still hanging from the vault of the former church of Saint-Martin-des-Champs.
Dates and Opening Time
Starts December 17, 2024
Location
The Pantheon
Place du Panthéon
75005 Paris 5
Access
Metro: Luxembourg / Cardinal Lemoine / Maubert Mutualité
