The Observatoire de Paris-PSL organizes or takes part in around ten events every year, thanks to the involvement of its astrophysicists and all its volunteer staff. Highlights include the opening of the Meudon site during the Fête de la science, and the Paris and Nançay sites during the European Heritage Days. In addition, our researchers regularly give lectures to the general public throughout France, sharing their latest discoveries.

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Calendar of recurring events organized by the Observatory, or those with which it is associated as a partner

January - February : La science se livre (Hauts-de-Seine) Researchers take part in events organized by libraries, media libraries and other cultural venues.
February 11 : International Day of Women and Girls in Science. To inspire future vocations, combat prejudice and actively support women’s scientific careers, the Observatoire joins forces with PSL University.
April  : Festival d’astronomie de Provence (several venues in Provence) Co-organized by astrophysicists from Marseille and amateur astronomers from Provence, this festival aims to present the latest advances in astrophysical research, and to showcase the highlights of Provencal astronomy.
June : Double science, Festival de la vulgarisation scientifique (Paris) This event is organized by the Café des Sciences, the Exploratoire and the Société française de physique.
July : Festival De la plage aux étoiles (Collioure, 66) Organized on the initiative of an astrophysicist at Observatoire de Paris - PSL, this festival is open to all and takes place every summer.
August : Fleurance Astronomy Festival (Fleurance, 32) Popular gathering dedicated to the sciences of the Universe. Many astronomy professionals are invited to give lectures.
September  : Le festival de l’espace Star’s UP (Meudon, 92) The Star’s Up Festival welcomes young and old alike for 4 days of lectures, projections, exhibitions, workshops, observations of the night sky... This free event aims to make scientific knowledge accessible to all.
September  : European Heritage Days (Observatoire de Paris and Observatoire radioastronomique de Nançay) Openings of the Paris site (registration required) and the Observatoire radioastronomique de Nançay
October : Fête de la science (Observatoire de Paris, site de Meudon) Openings of the Meudon site (registration required), for schools and the general public.
October : Le jour de la nuit (all France) National operation to raise awareness of light pollution and protect nocturnal biodiversity and the starry sky. Coordinated by Agir pour l’Environnement and supported by numerous national partners, Night Day is an opportunity to observe the sky and rediscover our relationship with the night, thanks to hundreds of light extinction and awareness-raising events. Every year in October, Jour de la Nuit brings together more than 650 events and light extinguishers, all over France and now in Quebec !
November : Rencontres du Ciel et de l’Espace (Paris) Every even-numbered year since 1998, the Rencontres du Ciel et de l’Espace has established itself as the must-attend event for sky enthusiasts and the curious. With its 2,500 daily visitors, it is undoubtedly the most important meeting point for the professional and amateur astronomical community in Europe. Organized by the Association française d’astronomie.
November : Festival Explor’Espace (Montrouge, 92) Interactive festival dedicated to astronomy and space, with a series of interactive, immersive and innovative experiences based on new space-related technologies. Organized by the Association française d’astronomie.
Replay conferences on our Youtube channel
Modifié le 19 mai 2025