How to reach Observatoire de Versailles Saint-Quentin-en-Yvelines (OVSQ)

Address

11 boulevard d'Alembert
78280 Guyancourt
Tel.: 01 80 28 54 96

Access by car:

 From Paris
from the St Cloud Gate, take the A13
then the A12 towards St-Quentin-en-Yvelines / Rambouillet
Exit St-Quentin-en-Yvelines Regional Center Cial

  From Rambouillet
Take the N10 towards Paris
Exit St-Quentin-en-Yvelines Regional Center Cial

Access by public transport:

From Paris, you can take a suburban SNCF train or the RER (Navigo zone 5).
  Train La Défense - La Verrière, stop Saint-Quentin-en-Yvelines (Montigny le Bretonneux)

  Train Montparnasse - La Verrière or Montparnasse - Rambouillet. Stop Saint-Quentin-en-Yvelines (Montigny le Bretonneux)
 
   RER C - Saint-Quentin-en-Yvelines stop (Montigny le Bretonneux)

Then a 10 to 15 minute walk to join the OVSQ