Cabot Science Library, located inside the Harvard Science Center, will be the new library for reference questions related to astronomy, astrophysics, and their related materials. They can be contacted at cablib@fas.harvard.edu or called at 617-495-5355.
One may also contact Robyn Rosenberg for questions- she is the Harvard subject liaison librarian for astronomy and astrophysics. She can be emailed at robyn_rosenberg@harvard.edu. She is located at the Science & Engineering Complex Library in Allston.
Checking out materials from Cabot can be done through Hollis, either directly on the service or through one of the other programs (BorrowDirect, Scan & Deliver, ILL). The majority of Cabot's items are off-site, so please make requests at least a day in advance so the materials can be prepared accordingly.