Paris Observatory, PSL University.

About Paris Observatory, PSL University

The Paris Observatory, a research institution of the Paris Sciences et Lettres University, is the foremost astronomical observatory of France, one of the largest astronomical centres in the world, and the world’s oldest observatory still in operation. Its historic building is on the Left Bank of the Seine in central Paris, but most of the staff work on a satellite campus in Meudon, a suburb southwest of Paris.