If the recent astronomical events have you curious about our universe and what you can see from Long Island then we’ve got a treat for you. Long Island is home to some incredible observatories where you can get a firsthand look at the wonders of the night sky. Whether you’re a stargazing pro or just curious about what lies beyond, these local observatories offer telescopes powerful enough to reveal distant planets, star clusters, and even galaxies. Here are six must-visit spots across the island where you can experience the universe like never before.
1. Avalon Nature Preserve
The Avalon Sky Dome and Sky Lab, led by amateur astronomers, feature innovative observatory structures for stellar and solar observing. The preserve houses several permanently mounted telescopes used for observing and imaging various celestial objects such as sunspots and solar flares. The observatories are used alongside educational programs, and events are regularly posted on social media. Visitors are encouraged to join the Avalon mailing list for updates.
Where: 200 Harbor Rd, Stony Brook
Phone: (631) 689-0619
Website: avalonnaturepreserve.org
2. Custer Institute and Observatory
Founded in 1927, Custer Institute is Long Island’s oldest public observatory. Every Saturday evening, the observatory opens to the public, offering guided tours of the night sky using powerful telescopes, including one of the largest folded refracting telescopes in the U.S. Custer also hosts astronomy lectures, concerts under the stars, and other educational events. The observatory is supported entirely by volunteers and donations.
Where: 1115 Main Bayview Road, Southold
Phone: (631) 765-2626
Website: custerobservatory.org
3. Mount Stony Brook Observatory
Located on the roof of the Earth and Space Sciences building at Stony Brook University, the Mount Stony Brook Observatory holds monthly Astronomy Open Nights, featuring lectures on astronomical topics followed by rooftop observing sessions. The observatory houses a 14” Meade telescope used to observe planets, nebulae, and galaxies. The events are popular and free to the public, with lecture topics changing regularly.
Where: 100 Nicolls Road, Stony Brook
Phone: (631) 632-6000
Website: astro.sunysb.edu
4. Hofstra Observatory
Located on the roof of Berliner Hall, the Hofstra University Observatory offers astronomy outreach events like “Stars on Sundays,” where the public can observe planets, stars, and galaxies using state-of-the-art Celestron telescopes. The observatory’s specialized solar-viewing telescope provides views of the Sun’s surface features. These events are free, but attendees must RSVP due to limited seating.
Where: 826 Huntington Pl, Uniondale
Phone: (516) 463-2759
Website: hofstra.edu/observatory
5. Vanderbilt Observatory at the Vanderbilt Museum & Planetarium
The Vanderbilt Observatory, located at the Vanderbilt Museum & Planetarium, opens every Friday night for the public to view celestial objects through their 16” Meade Cassegrain telescope. The facility also includes a specialized Hydrogen-Alpha Telescope for viewing the Sun during daytime hours. Visitors can explore features like solar flares and sunspots, along with star clusters and galaxies on Friday nights.
Where: 180 Little Neck Road, Centerport
Phone: (631) 854-5532
Website: vanderbiltmuseum.org
6. Hamptons Observatory
The Hamptons Observatory, located on the Ross School campus in East Hampton, houses the South Fork’s first astronomical observatory, which is equipped with Long Island’s largest research-grade telescope. This 501(c)(3) nonprofit organization offers free programs year-round, including star parties, planetarium shows, and astronomy lectures. The observatory aims to make astronomy accessible to everyone, regardless of economic status.
Where: 18 Goodfriend Dr, East Hampton
Phone: Contact via email
Website: hamptonsobservatory.org
Amateur Observers’ Society of New York
The Amateur Observers’ Society of New York (AOSNY) is an excellent resource for anyone interested in learning more about astronomy. Founded in 1965, AOSNY holds monthly meetings, often featuring expert guest speakers, and regularly organizes observing events for the public. They also provide educational resources and support for amateur astronomers on Long Island.
Where: Various locations (meetings at Hofstra University and Cradle of Aviation Museum)
Website: aosny.org
Photo by Vikash Singh.
