{"id":245746,"date":"2026-09-12T19:49:03","date_gmt":"2026-09-12T17:49:03","guid":{"rendered":"https:\/\/www.parisselectbook.com\/?p=245746"},"modified":"2026-09-12T19:49:07","modified_gmt":"2026-09-12T17:49:07","slug":"observatoire-paris-historic-domes-free","status":"publish","type":"post","link":"https:\/\/www.parisselectbook.com\/en\/2026\/09\/12\/observatoire-paris-historic-domes-free\/","title":{"rendered":"The Observatoire de Paris is opening its historic domes for free on 20 September"},"content":{"rendered":"

Imagine walking through the same rooms as the astronomers who drew the first maps of the French sky, and doing it for free, right in the heart of Paris<\/a>. That is exactly what the Observatoire de Paris<\/strong> is offering on Sunday 20 September 2026<\/strong>, as part of the European Heritage Days<\/a>.<\/p>\n

One Sunday to step inside a place founded more than 350 years ago<\/h2>\n

Founded in 1667<\/strong>, the Observatoire de Paris<\/strong> is one of the oldest observatories in the world still in operation. Its original building, designed by architect Claude Perrault, the man behind the colonnade of the Louvre<\/a>, is perfectly aligned with the four cardinal points. That architectural detail is no accident: it speaks to the scientific rigour that shaped its construction and continues to guide the research carried out there today.<\/p>\n

Because this is no frozen museum. Internationally renowned researchers conduct cutting-edge work in astronomy and astrophysics<\/a> on these very premises. Visiting the institution<\/a> means both crossing several centuries of the history of science and brushing up against research that is very much alive.<\/p>\n

What visitors will be able to see on 20 September<\/h2>\n

The guided tour programme, each visit lasting one hour, grants access to spaces that are rarely open to the general public. Several highlights stand out along the route.<\/p>\n

    \n
  • The panoramic terrace<\/strong>, offering a sweeping view over the capital<\/li>\n
  • The Arago dome<\/strong> and its large astronomical refractor dating from 1854<\/strong><\/li>\n
  • The monumental room known as the “Cassini” room<\/strong>, engraved with the Paris meridian<\/li>\n
  • The Grande Galerie<\/strong> and its collection of historic scientific instruments<\/li>\n
  • The Council Room<\/strong>, with its painted ceiling and portrait gallery<\/li>\n<\/ul>\n

    Visitors will also be able to admire the Arago medallions, the meridian and equatorial telescopes installed in the gardens, and the speaking-clock room. Each space tells a chapter in the story of French institutional astronomy, from the earliest observations to the instruments of the 19th century.<\/p>\n

    A scientific heritage as much as an architectural one<\/h2>\n

    The appeal of the Observatoire de Paris<\/strong> goes well beyond its classical architecture. The historic telescopes, astronomical clocks and celestial globes preserved on site form an exceptional collection of period instruments. These objects offer a tangible sense of how astronomers worked before the digital age.<\/p>\n

    The building itself is also listed among the major landmarks of French classicism. Designed by Claude Perrault, it stands as a direct testament to the scientific and architectural ambitions of the 17th century. In that sense, a visit here sits at the crossroads of art history and the history of science.<\/p>\n

    Practical information and how to book your spot<\/h2>\n

    Visits take place on Sunday 20 September 2026, from 12:00 to 17:00<\/strong>, at 98 boulevard Arago, 75014 Paris<\/strong>. Entry is entirely free, but booking is compulsory<\/strong>. Places can be reserved on the Billetweb platform, via the dedicated page for the 2026 Journ\u00e9es du Patrimoine at the Observatoire de Paris<\/strong>.<\/p>\n

    Allow one hour for the guided tour when planning your day. Astronomers based at the observatory accompany each group, making this a rare opportunity to speak directly with active scientists at one of France’s leading astrophysics research centres.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Imagine walking through the same rooms as the astronomers who drew the first maps of the French sky, and doing it for free, right in…<\/p>\n","protected":false},"author":15,"featured_media":245747,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2687],"tags":[9609],"quartier":[],"class_list":["post-245746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-que-faire-a-paris-en","tag-paris-observatory"],"acf":[],"yoast_head":"\nThe Observatoire de Paris is opening its historic domes for free on 20 September<\/title>\n<meta name=\"description\" content=\"The Observatoire de Paris opens its doors for free on 20 September 2026: guided tours, panoramic terrace and historic instruments, booking required.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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