Public Open Night at the Observatory The Public Open Night at the Observatory is a chance for people to come observe the night sky through telescopes and binoculars and see things they otherwise might not get to see, and learn some astronomy as well. The Open Nights are held most Wednesday evenings throughout the year, weather permitting. It is open to everyone. Starting times are 7:30pm during the fall and winter, and 8:30pm during the spring and summer. The program lasts about an hour.