Monday, December 31, 10:00 PM - 1:00 AM - First Hike and Telescope Night. The Dyer Observatory Seyfert Telescope will be open for viewing from 10 PM - 11 PM. If cloudy, we will be open for "Ask an Astronomer" and Observatory Tours. The Radnor Lake Ranger-Led First Hike will depart from Dyer at 11 PM and last for two hours returning to the Observatory at 1 AM. WEATHER PERMITTING. FREE. Reservations are limited to 50 people and EACH PERSON MUST HAVE THEIR OWN RESERVATION.