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.

July

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 ...

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What’s Up in Denver? October 20th through 26th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. October 20: Look for the gas giant Jupiter next to the twins Castor and Pollux in the constellation Gemini in the eastern sky after midnight. October 21: Catch comets C/2025 R2 (SWAN) and C/2025 A6 (Lemmon) with your naked eye: 7:30 PM & 10:00 PM Boulder Stargazing – Dark Skies & Deep Space: Orionids and the Science of Starlight (Registration required): 📍 Beech Shelter, Boulder: 5:45 PM New Beaver Moon: 6:25 AM October 22: Orioinid Meteor Shower Peaks: After Midnight Dark Sky Salida Presentation: 📍 Valley View…
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Two Bright Comets on the Same October Night

On the evening of October 21, 2025, skywatchers are in for a rare celestial treat: not one but two comets—C/2025 R2 (SWAN) and C/2025 A6 (Lemmon)—will be bright enough to spot with the naked eye. To make the night even more special, it also falls on the new moon, meaning the sky will be as dark as it gets, free of interfering moonlight. That gives observers the best possible conditions to enjoy both comets on the same night—a truly extraordinary opportunity for amateur and seasoned astronomers alike. What is a Comet? Comets are often described as “dirty snowballs” — icy…
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Double the Meteors: The Orionids and Southern Taurids Light Up October Skies

October is one of the best months of the year to catch a meteor shower. This year, skywatchers get a bonus: two meteor showers active at the same time. The famous Orionids will peak in late October, and the slower but often brighter Southern Taurids will also be putting on a show. If you spend some time under dark skies, you may see meteors from both showers streaking across the night. What Are the Orionids? The Orionids come from tiny bits of dust left behind by Halley’s Comet. Every October, Earth passes through this trail of debris. When those particles…
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What’s Up in Denver? October 13th through 19th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. October 13 (Indigenous People’s Day): Catch the 3rd quarter Hunter’s Moon with the twin stars Castor and Pollux in the constellation Gemini in the early morning eastern sky. Last Quarter Hunter’s Moon: 12:12 PM October 14: Look for the waning crescent Hunter’s Moon next to the gas giant Jupiter as the split the constellations of Gemini and Cancer in the early morning eastern sky. October 15: Catch the waning crescent Hunter’s Moon near the spectacular Beehive Cluster (M44) in the constellation Cancer in the early…
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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.