
Custer Institute and Observatory is Long Island's oldest public observatory - open from 8 pm to midnight on Saturdays!
Explore the night sky with our volunteers, powerful telescopes, tours, and live events.
Join us every Saturday night for public observing sessions, where you can explore the cosmos through our powerful telescopes.
When the skies are clear, our knowledgeable volunteer staff will guide you on a tour of the stars, planets, and beyond.
Saturday Night Public Observing
Doors open at 8 PM
Observing from dark until midnight (weather permitting)
All observing takes place outdoors—please dress appropriately. Seasonal hours and times of darkness may affect skywatching times.

EVENTS
Outdoor Events: Most events take place on our lawn. We encourage you to bring a blanket or chair to make your experience more comfortable.
Rain Dates: Rain dates (when necessary) will be noted on our website, social media, and/or Eventbrite for your convenience.
Annual Membership Meeting & BBQ
Saturday, June 14, 2025
4:30 pm
MEMBERS ONLY MEETING
A Concert in the Dome:
POORE ASTRONOMERS
Saturday, June 28, 2025
7:00 pm
Welcome the summer with the voice and lute duo named Poore Astronomers, inside the unique accoustic space of our astronomical observation dome! The program includes surviving songs from Thomas Morley's First Book of Ayres, first published in 1600; songs which are full of pyrotechnic writing for the lute, requiring virtuosic playing seen nowhere else in the English Lute song repertoire. Drew Ivarson (tenor) and Daniel Keene (lute) will perform these pieces with a reconstructed accent from 16th century London and played on an authentic, gut-strung Renaissance lute.
The Elizabethan era, spanning the reign of Queen Elizabeth I (1558-1603), is often seen as the peak of the English Renaissance, a period known for its flourishing of arts, literature, and music. This concert will be presented in the unique acoustical splendor of the Custer Observatory dome. This intimate concert promises to be a most memorable experience. Not to be missed! Come hear the instrument that Renaissance humanists thought was perfectly able to evoke the harmony of the spheres.
Following the concert, when the skies are dark, Observatory staff will provide guided tours of the night sky (weather permitting) through our many telescopes on site, including the telescope in our historic observation dome. Immediately following the concert, for those interested in staying, Observatory staff will briefly talk about the history of Custer Institute and the apochromatic Zerochromat telescope installed inside the dome.
$40 Adult, $30 Custer Observatory Members. Attendance to this intimate performance will be limited - reserve your seats early! Note: Guests must be able to climb two steep flights of stairs to access the observatory dome where the concert is being held.
Drew Ivarson, tenor, performs regularly as a choral singer and soloist in the New York City area. He regularly sings with Polyhymnia, Stony Brook Baroque Players, New York Continuo Collective, and Sing We Enchanted. He also sings regularly at St Agnes RC Church in Midtown, Manhattan, and for the Jewish High Holy Days under Cantor Leon Berger at The Jewish Center of Kings Highway. Outside of his performing life, Drew maintains a small private studio teaching voice and piano, and chases his toddler all over Bayside, NY.
Daniel Keene, lutenist, performs on an array of plucked string instruments including 16th and 17th century lutes, vihuela, Baroque guitar, 19th century guitar, modern guitar, and extended electric guitars. He has concertized extensively as a soloist, consort player, continuo player, and in theater and Off-Broadway as a pit orchestra musician. In addition to the Poore Astronomers, Daniel performs regularly with Moka Pot Duo, Red Door Chamber Players, New Place Players, and Samadi-Keene Duo. He has also performed with Long Island Baroque Ensemble, Bacheler Consort, Golden Williams Duo, and New York Continuo Collective. Daniel is currently on the faculty at Nassau Community College.
EXPLORING & NAVIGATING THE SUMMER NIGHT SKY
Saturday, July 19, 2025
9:00 pm
Learn how to explore and navigate the summer night sky, including the summer constellations and stories behind them!
Gazing up at a star-filled night sky is awesome and humbling. To the novice stargazer, it can be overwhelming and disorienting. Throughout history, the night sky has served many functions to humanity- a clock, a calendar, a compass, a map and even a story book. Join stargazing lecturer Randall DiGiuseppe of the Custer Institute & Observatory for an evening of learning the basics of navigating the night sky as well as learning the locations and the folklore behind the most prominent constellations of summer.
Learn how to spot the North Star, the Summer Triangle, the Milky Way Galaxy, and the stories behind summer’s most well-known constellations. Learn also how to find your way around the night sky and how to use it to orient yourself on the ground.
This event is open to everyone. Just bring an inquisitive mind, a blanket and your imagination.
Randall DiGiuseppe is a professional artist, lecturer, telescope builder and amateur astronomer for over four decades. He is a lifetime member of the Custer Institute and Observatory and recipient of the Astronomical League’s Messier Award. He conducts lectures on the dynamics, history and art of the night sky throughout the country.
Following the presentation, Observatory staff will provide guided tours of the night sky (weather permitting) through the many telescopes on site, including the apochromatic Zerochromat telescope in our historic observation dome.
$5 Adult, $3 Children Under 16, Observatory Member FREE. Your donations make it possible to offer programs like these and are greatly appreciated. Due to limited space, registration is strongly encouraged.
Please bring a blanket or chair to enjoy the presentation.
SPICE UP THE
HIGH ENERGY
The Rites of Spring Music Festival
Saturday, July 26, 2025
7:00 pm
A slice of King’s Cake on the shores of the East End!
Real East End Brass (REEB!) brings the Big Easy to the Rites of Spring Festival. As we march along to Second Line sounds, we invite you to join our parade and sing along to those New Orleans classics.
Following the concert when the skies are dark, Observatory staff will provide guided tours of the night sky (weather permitting) through our many telescopes on site, including the apochromatic Zerochromat telescope in our historic observation dome.
​Program
Bourbon Street Parade
A Closer Walk with Thee
Second Line
Feel Like Funkin’ It Up
IDK
Back to my East End Home
St. James Infirmary
Music To Your Life
Dynamite
Hey Pocky Way
What a Feeling
Mardi Gras in NO
I’ll Fly Away
Saints Go Marching In
Do Whatcha Wanna
$45 Adult, $30 Custer Observatory Members and Friends of R o S, Children Under 16 FREE. Attendance to this in-person performance will be limited - reserve your seats early! Due to the outdoor nature of this program, a rain date will be scheduled as needed.
Please bring a blanket or chair to enjoy this outdoor presentation.
REEB Real East End Band
Tye Granger, Tenor Saxophone
Dylan Green, Vocals
Troy Grindle, Drum Kit + Fiddle + Back Up Vocals
Chris Mandato, Trumpet
Nick Silipo, Guitar
Meghan Kelly, Baritone Saxophone + Clarinet
​Shawn Ward, Sousaphone + Trombone
PROGRAMS + RESOURCES + CLUBS
-
WEATHER
Clear Skies Ahead!
Find the latest weather forecasts tailored for astronomers, including cloud cover, precipitation, dewpoint, wind conditions, and Moon phases. Our easy-to-read key helps you decide if it’s a perfect night to bring out your telescope!
-
WHAT'S UP?
Skywatching highlights each month, provided by NASA.
-
SCHOLARSHIP
Supporting the Next Generation of Scientists & Innovators. Available to High School Seniors throughout the North Fork.
-
RESOURCES
Whether you're a seasoned astronomer or just starting your journey into the cosmos, our collection of resources will help guide you.
-
HONEY BEE CLUB
Custer's Honey Bee Club is an educational program focused on environmental sustainability and honeybee stewardship.
Send an email to learn more.
-
THE MUSIC PROJECT
Dedicated to bringing high-quality performances to the North Fork community, featuring a diverse repertoire with a strong educational focus. A unique stargazing experience follows each performance—audiences are invited to explore the night sky with guidance from our expert volunteer staff, using our historic observation dome and an array of on-site telescopes.
Support the North Fork Dark Sky Coalition
Take action to protect our night skies:
Pledge to turn off unnecessary lights and spread awareness,
Update Your Lighting by using dark sky-friendly fixtures and warm-toned bulbs, and
Become a Partner to advocate, educate, and support local Dark Sky initiatives.
Take the pledge and join the North Fork Dark Sky Coalition
AFFILIATIONS + SUPPORTERS + PARTNERS
Stay in our universe.
Sign up for exclusive updates and news on events, programs, lectures, and live music
—no black holes of spam, just stellar content
delivered to your inbox. Subscribe.