Observatoire de Paris

61 avenue de l'Observatoire - 75014 Paris Montparnasse - Alésia
Due to work on the sites in Paris and Meudon, visits to these two sites are suspended. The resumption of visits will be announced as soon as a fixed deadline has been decided. The garden of the Observatory remains open. See opening hours on
Historic building. Old and modern astronomical instruments. The oldest observatory still in operation. (Architect: Claude Perrault 1667-1672). Research and teaching establishment. The Paris observatory is the origin point of the meridian in France, geodisic meridian (1729-Jacques Cassini) that crosses the country from Dunkerque to Perpignan (meridian used for the first map of France). It was in 1884 that an international convention adopted the meridian of Greenwich as the meridian of origin.


Open and free entrance for everyone during two annual events: European heritage days (in September) and the Fête de la Science (in October).





61 avenue de l'Observatoire
75014 Paris
Parking lot
Montparnasse, 141 Boulevard du Montparnasse - 75006 Paris
Public transportation
BPort Royal
38Hopital Saint-Vincent De Paul

Useful information