For the Journées du Patrimoine 2025, the Observatoire de Paris, a major astrophysics research center, welcomes the public to the heart of Paris. An exceptional heritage and unique observation facilities await you to discover alongside the astronomers.
A prestigious and historic site dedicated to astronomy and scientific research, the Paris Observatory was founded in 1667 and is, in fact, one of the oldest observatories in the world. It houses majestic buildings and ancient astronomical instruments, offering the curious a fantastic plunge into the history of astronomy.
Historic telescopes, astronomical clocks and celestial globes are just some of the period scientific instruments that visitors can admire. But in addition to its historic role, the Observatoire de Paris also continues to be a center for research and training in astronomy and astrophysics. Scientists of international renown carry out advanced research here, contributing to our understanding of the universe and its mysteries.
For the Journées du Patrimoine 2025, on September 20 and 21, come and discover the Arago medallions, the meridian and equatorial telescopes in the gardens, the talking clocks room, the Council Chamber and its painted ceiling, the Grande Galerie and its antique instruments, the monumental Meridian room known asthe "Cassini room", the panoramic terrace with its breathtaking view over Paris, the Arago dome and its large astronomical telescope dating from 1855. Please note that visits must be booked in advance!
Visitors will tour the Perrault building, guided by an astronomer. The hour-long tour takes in the museum, the meridian room and the roof, with a visit to the large dome.
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Dates and Opening Time
From September 20, 2025 to September 21, 2025
Location
Paris Observatory
77 avenue Denfert-Rochereau
75014 Paris 14
Prices
Free
Official website
www.observatoiredeparis.psl.eu
