Hours & Location

Visitors wishing to work with Wolbach Library collections should review our Collection Access Policy before making plans to visit the CfA.


Reference & Circulation
10 am - 4 pm, Monday - Friday

Open Doors
9 am - 5 pm, Monday - Friday

The Library is closed on Federal holidays.

24-hour access is available to ID card holders. If your ID card does not work, please contact the HCO Business Office.

Spiral staircase shown in black and white. A bust of a man sits in a recess at the base of the stairs. The stairs lead up to a telescope dome. The bust is Edward Pickering, a former director of the Observatory.
Bust of Edward Pickering, Jenny Woodman.


60 Garden Street, Cambridge, MA 02138  
The Wolbach Library is located in P Building. Enter the CfA through the Perkin Lobby.
The Library will be immediately to your left.

The Glass Plate Collection is housed in the Observatory Plate Stacks in D Building.
Enter the Observatory at Phillips Auditorium. The Plate Stacks will be immediately to your left.


The parking lot at the CfA requires a parking permit. Temporary permits, subject to availability, may be purchased online


We are committed to supporting all visitors to the Observatory. Unfortunately we are constrained by the 19th (and 20th) century buildings in which our collections are stored. For this reason, please contact us if you require the use of a wheelchair so we can make sure you are able to use our space.