The Library offers documentation and services to researchers and keeps historical collections from Paris Observatory.

The Library
Practical Information
Reference collections
Services for the public
Heritage collections
Presentation of the Library
Electronic resources
Calames (archival collections)
Cosmos (museum collections)
Digital library
It is one of the most beautiful astronomical-astrophysical libraries in the world. The Library has two core missions: providing researchers with the most complete and relevant documentation and services, preserving and enhancing a 350-year-old heritage which still expands today.
Although the Library is mainly devoted to Paris Observatory scientists, it is also accessible to other audiences, mainly researchers in astronomy-astrophysics and historians.