You can celebrate International Observe the Moon Night on Saturday, September 19, 2026, from 5 p.m. to 10 p.m. at Chamberlin Observatory and Observatory Park in Denver. The FREE event will bring together telescopes, hands-on activities, science organizations, open space educators, dark-sky advocates, library resources, and community partners for an evening of lunar observing, astronomy, and night-sky appreciation.
At the historical Chamberlin Observatory and Observatory Park, visitors will be able to explore the Moon through telescopes operated by Denver Astronomical Society volunteers, participate in Moon-themed activities, learn about dark skies and Colorado observing locations, meet regional science and education organizations, and visit the Denver Public Library Bookmobile.
Weather permitting, visitors can view the Moon through Chamberlin Observatory’s historic 20-inch Alvan Clark-Saegmuller refractor telescope. DAS members will also have telescopes set up on the south lawn, providing additional views of the Moon and other celestial sights.
If you recently purchased a telescope and need help learning how to use it, arrive before dark and bring it with you. DAS members will be happy to help you get started. Don’t own a telescope? No problem! This event is designed for everyone, whether you’re a longtime observer or simply curious about the night sky.
Activities will take place outdoors in Observatory Park, with limited, ticketed access to Chamberlin Observatory as part of the evening’s observing activities. Visitors are encouraged to dress for changing evening weather and bring curiosity about the Moon, astronomy, and the night sky.
Participating organizations include Colorado Parks and Wildlife / Jackson Lake State Park, DarkSky Colorado, Denver Public Library, Metropolitan State University of Denver, Planetary Science Institute, Space Foundation Discovery Center, University of Denver, University of Colorado – Denver, and Wings Over the Rockies.
International Observe the Moon Night is a worldwide public event that encourages observation, appreciation, and understanding of the Moon and its connection to space science, exploration, and human culture. The annual event connects scientists, educators, astronomy clubs, and lunar enthusiasts around the world.
“International Observe the Moon Night is about celebrating the Moon, of course, but it’s also about sharing the bigger joy of astronomy and the wonderful dark skies we have here in Colorado,” says Katherine Bond, President of the Denver Astronomical Society.
2930 E. Warren Ave., Denver.
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