Camille Flammarion Observatory

The Camille Flammarion Observatory is an astronomical facility and protected monument in Juvisy-sur-Orge featuring a five-meter dome with an innovative opening system that allows instruments to be moved outside for observations. The building still houses original 19th-century scientific instruments that define its research character.

The observatory was founded in 1883 by French astronomer Camille Flammarion, who converted a former postal relay station into a scientific research center. This transformation made the site a significant hub for astronomical work in the region.

The entrance gateway displays a golden star with the Latin motto 'Ad veritatem per scientam', meaning 'Toward truth through science'. This inscription reflects the scientific ideals that shaped the site from its beginning.

The facility is located on Avenue de la Cour-de-France and is accessible by public transport; visitors should check opening hours in advance. The grounds are easy to walk through and feature quiet green spaces that invite lingering.

The grounds include a meteorological station and a former agricultural research area, spaces that reveal how Flammarion understood science holistically. The park preserves old trees that the founder himself planted, which still shade the property today.