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The Cornell Astronomical Society

Open every Friday 8 PM - midnight.

Open all summer, but less staffed—check here in case of sudden cancellations.

The Cornell Astronomical Society (CAS) has conducted public viewing nights at Cornell University's Fuertes Observatory for over 50 years. We open the observatory every Friday night during the academic year from 8 PM until midnight, regardless of clouds.


During Cornell winter and summer breaks, check this page to see if we're open. Join our listserv at the bottom of this page for weekly updates on events!


Visit our Hours & Directions page for directions and parking information, the Open House and Accessibility page for what to expect when there, and our Event Calendar for a schedule of upcoming events.

Lectures to the public are given by Cornell astronomy faculty and other researchers several times throughout the semester on Friday nights, prior to the open house. Visit the Lecture Series page for a list of upcoming lectures. 


The Cornell Astronomical Society is Cornell's astronomy club. All Cornell students, regardless of prior experience or area of study, are welcome to become members of CAS. Visit About the Club for more information.

The Cornell Astronomical Society
& Fuertes Observatory

Latest Newsletter:
Fuertes Observatory Tours and Group Events

Organizations and informal large groups may request an educational observing session at Fuertes Observatory conducted by CAS volunteers. These can be arranged on non-Fridays and any night when the observatory is not reserved for introductory astronomy classes. Private sessions are completely free! Scheduling of events is subject to the availability of CAS officers and to the full discretion of the Cornell Department of Astronomy. Send us an email to arrange an event.

Check out our newsletters by clicking below!
Mailing List

Fill out the form below to be added to our email listserv. We generally send out a weekly announcement listing the events at Fuertes for that Friday, as well as notifications about special events on non-Friday nights.

Ignore the "This request is invalid" message. Check your email for subscription verification.
Contact for assistance.
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