All directions to Paris and Meudon Observatory are described in detail here . In the following page we provide additional details to find the “Salle du Conseil” in Paris Observatory.
The entrance of of Paris Observatory is 77 Av Denfert-Rochereau, in between RER station Port-Royal, and RER/Metro station Denfert-Rochereau. There is a guard at the entrance. On Monday 25, the Observatory is normally closed, but will be open for us. You will have to decline your identity so do not forget your ID. Your AstroGeoFit badge will be given there. See below the entrance of Paris Observatory.
Once you go out of the building, follow the signs to reach the Old Observatory (from 1667) and the Salle du Conseil.
