Astronomy Day Saturday, April 29, 2-5 and 6-9 p.m. Join us for hands-on activities celebrating Astronomy and Science! Observe the Sun (safely) and the Moon through our telescopes. Use your body to tell time on a sundial. The 3M Observatory will be open for solar observing during the day and peeks of the Moon and other celestial objects in the evening sky. The event is appropriate for families with children ages six and older. Activities are free. Planetarium shows and laser concerts are an additional cost.