Yerres is located in France (Essonne, Île-de-France) and time zone Europe/Paris.
Places nearby are Brunoy, Crosne and Limeil-Brévannes.
Nantes is 363 km away, London is 372 km away and Lyon is 377 km away as the crow flies.
Distances from Yerres to the most important cities in France and the world.
48.7178500°
2.4933800°
Astronomical observatory in Wisconsin, USA
https://en.wikipedia.org/wiki/Yerkes_Observatory