Our first two 2024 Public Observing Nights have been scheduled at Marsh Creek State Park!  See the information here.


The ChesMont Astronomical Society (CAS) has operated in Chester County and Montgomery County area in Pennsylvania since 1986. We are dedicated to observing the night sky and educating the public about the wonders of the universe through outreach events.

We meet monthly, on the Sunday evening closest to the full moon, at 7pm at the Crow’s Nest Preserve (see map) in Elverson, Pennsylvania.

Do you want to know more?

Interested in participating in club activities? Take a look at the Membership page for more information or our events calendar.