Welcome to the Custer Institute

The Custer Institute and Observatory is Long Island's oldest public observatory (est.1927). Open to the public every Saturday evening from dark until midnight, our staff of volunteers will give you a tour of the facilities and the night sky through our powerful telescopes. Custer has frequent lectures, classes,concerts, art exhibits and other special events. Consider our observatory for your next meeting or theme party.

As the days get cooler, the night comes earlier. Remembering that Custer is run by volunteers, despite the time of darkness,
Custer will open at 7pm. Observing from the dome will begin after 8pm.

See you then!

Weather Permitting:

Saturday Night Observing, open to public, dark to midnight, weather permitting Staff provide guided tours of the sky. Clouds, fog, rain, and full moon nights are not good nights. The less moon, the better for most observing. Check the moon calendar. Plan your visit by reading this.

Updated: August 22, Two Thousand Sixteen
url and counting visits
We are not alone.


At Custer

Membership & Business

Sponsors, Clubs, & other Astronomical Organizations