Sharing the Night Sky with the Public Since 1949

For over seventy-five years, the Denver Astronomical Society has brought together stargazers across the Denver metropolitan area and beyond. The society hosts dozens of events and activities yearly to promote amateur astronomy across our unique region, one mile nearer the stars.

June

8:30 pm - 8:30 pm

Open House

Looking for a FREE fun family activity? Join the Denver Astronomical Society for our monthly Open House Saturday night at dusk. This event will occur on the south lawn of DU’s historic Chamberlin Observatory, 2930 E. Warren Avenue, Denver. Weather … Read More ...

View Detail

What’s Up in Denver? September 15th through 21st, 2025

Here’s a brief look at what’s going on in the Mile High City this week. September 15: Find the waning crescent Corn Moon near the Shoe-Buckle Cluster (M35), an open star cluster in Gemini in the eastern sky: 2:00 AM September 16: Look for the waning crescent Corn Moon near Jupiter, Castor and Pollux in the constellation Gemini in the eastern sky: 2:00 AM NASA Night Sky Network Webinar Series: Secrets of the Sun: Developing New Ways to Observe Our Closest Star with Becca Robinson: Youtube Livestream: 7:00 PM September 17: Catch the waning crescent Corn Moon near the Beehive Cluster (M44),…
Click here to read more
Breckenridge Achieves Dark Sky Community Certification

The Town of Breckenridge has officially become a Certified Dark Sky Community, recognized by DarkSky International for its commitment to reducing light pollution and protecting the night sky. This makes Breckenridge the first mountain ski resort community in Colorado to earn this distinction, adding to its long history of environmental stewardship. Where is Breckenridge? Located just 80 miles west of Denver, Breckenridge sits at 9,603 feet in the heart of the Rocky Mountains. Known worldwide as a premier ski destination and historic mining town, Breckenridge also manages more than 5,000 acres of open space and 65 miles of trails—making it…
Click here to read more
What’s Up in Denver? September 8th through 14th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. September 8: DAS General Meeting: The Splendor of T Corona Borealis by Dr. Jordi Casanova: Secular Hub or livestream via Zoom (check your membership email for details): 7:00 PM Catch the waning gibbous Corn Moon near Saturn September 9: As the nights get longer and autumn approaches, look for the Great Square asterism in the constellation Pegasus. (Read more about asterisms): 9:00 PM September 10: The waning gibbous Corn Moon reaches perigee (it’s closest distance from Earth at 364,777 km): 6:14 AM Colorado Dark Sky Certification…
Click here to read more
AL/NASA 35 Years of Hubble September Challenge

Last month, we discussed the Hubble’s Night Sky Observing Challenge and the August targets announced by the Astronomical League and NASA to celebrate 35 Years of the Hubble Space Telescope. These organizations have announced a new set of targets for the month of September. Read on to find out more. Discover the Universe Like Hubble! Join the celebration of the Hubble Space Telescope’s 35th anniversary by participating in the Hubble’s Night Sky Observing Challenge! Equipped with a telescope, clear skies, and star charts, you can explore breathtaking nebulae and galaxies that Hubble has captured from space. A fresh list of…
Click here to read more

Chamberlin Observatory Tours

The Denver Astronomical Society hosts weekly and monthly events* at the University of Denver’s historic Chamberlin Observatory, which features its prized 1894 Alvan Clark-Saegmuller 20-inch refracting telescope. The Observatory serves as the DAS home base for numerous Astronomy Nights, Open Houses, and special events throughout the year.

Due to overwhelming demand, we are changing how we reserve our Astronomy Nights and adding more to the calendar. For details, see our Reservations page.

If you have any questions about EXISTING reservations or want to change your existing reservation, email us at reservations@denverastro.org.

M•45 – Pleiades, Seven Sisters, Subaru image by Darrell Dodge

Astrophotography Special Interest Group

The Denver Astronomical Society (DAS) has established a Special Interest Group amongst its members devoted to Astrophotography. Do you want to learn or improve your skills in astrophotography? Do you enjoy viewing pictures of the Sun, Moon, Planets, or Deep Sky Objects? Can you take similar images? You may have skills that you could pass on to novice members. Consider joining DAS and being part of this Special Interest Group. Please email us for more information. astrophotogroup@denverastro.org

The Van Nattan-Hansen-Anderson Scholarship

Established in 1973, the DAS Van Nattan-Hansen-Anderson Scholarship supports graduating high school and undergraduate college students majoring in astronomy and the physical sciences. Interested and eligible students are invited to apply for funding on the Scholarship Page.