- THE CUSTER INSTITUTE, INC. OBSERVATORY Southold, New York GPS: N 41 03.122 & W 72 26.071 The Darkest Skies of any Observatory on Long Island PUBLIC OBSERVING EVERY SATURDAY AFTER DUSK, WEATHER PERMITTING! Last updated 6/1/02. Up coming activities up dated. SATURDAY JUNE 1st 2002 STARTING 5:30 PM Dr. EMILY BARNETT S AN EVENING OF ART AND SCIENCE & SCIENCE ART OPENING ENJOY SOME WINE AND CHEESE ...www.custerobservatory.org