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.

September

5:00 pm - 10:00 pm

Open House – International Observe the Moon Night, Saturn & Neptune!

Looking for a FREE fun family activity? Join the Denver Astronomical Society for a special International Observe the Moon Night Open House at Denver University’s historic Chamberlin Observatory. International Observe the Moon Night is a worldwide celebration of our nearest celestial … Read More ...

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What’s Up in Denver? April 6th through 12th, 2026

Here’s a brief look at what’s going on in the Mile High City this week. April 6 (Easter Monday): Look for the waning gibbous Pink Moon next to Antares, the red heart of the scorpion in the constellation Scorpious low in the southeastern sky around 1:30AM April 7: The waning gibbous Pink Moon reaches apogee, its farthest distance from Earth at 404,970km: 2:00 AM April 8: Colorado Springs Star Party: Free in-person event at Pikes Peak State College Rampart (North) Campus: 8:00 PM April 9: NASA’s Lucy Mission: Updates and Mainbelt Encounters with Dr. Simone Marchi and John Spencer: Ticketed…
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Quarterly Letter from the President – April 2026

From the President A regular message from DAS’s president is something past presidents have done and I want to continue this tradition. My intent is to share goals, ideas, and encourage participation in the Denver Astronomical Society. Please feel free to contact me at president@denverastro.org. One of the benefits of membership in DAS is our monthly General Membership Meetings, which occur on the second Monday of each month. These are conducted in-person and virtually via Zoom. Each month, we have speakers from a variety of backgrounds that provide engaging presentations on a wide range of topics for those who are…
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Of Mario Motta, Jean Mueller, the late Russell Porter, a Lunar Eclipse, and me: Skyward for April 2026

On the morning of 3 March, 2026, a total eclipse of the Moon darkened the night sky over all of the world that was in night. The eclipse was fabulous. During its total phase, the Moon was not really its usual coppery red color but more of a greyish-brown. On the Danjon luminosity scale, I gave it about a 1.5 on the scale of 0 to 5. I was lucky to view this eclipse during the inaugural session at the San Diego Astronomical Association’s newest acquisition. I do not recall an eclipse that was more fun than this one. And…
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What’s Up in Denver? March 30th through April 5th, 2026

Here’s a brief look at what’s going on in the Mile High City this week. March 30: The waxing gibbous Pink Moon reaches Descending Node, when it moves from north of the ecliptic to south of it, crossing the plane of Earth’s orbit around the Sun: 4:34 AM March 31: Check out the transit of Io’s shadow across the face of Jupiter, looking at Jupiter right as the sun is setting, Io is just finishing it’s transit in front of the gas giant high overhead in the constellation Gemini, but it shadow will remain on its face from sunset until…
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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.