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 6th through 12th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. October 6: Full Hunter’s/Harvest Moon: 9:47 PM October 7: Look for Jupiter occulting the Twinkling Comet Cluster in the low eastern skies in Gemini – The “Twinkling Comet Cluster” (NGC 2420) is a rich open cluster often described as a ghostly glow that fans out like a comet’s tail before resolving into stars: 1:00 AM October 8: The waxing gibbous Hunter’s Moon reaches perigee (it’s closest distance to Earth at distance 359,819km) at 6:50 AM. Look for the Draconid meteor shower to peak into the…
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AL/NASA 35 Years of Hubble October Challenge

Last month, we discussed the Hubble’s Night Sky Observing Challenge and the September 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 October. Read on to find out more. Explore the Night Sky Like Hubble! You can help celebrate the 35th anniversary of the Hubble Space Telescope by taking on the Hubble’s Night Sky Observing Challenge! With a telescope, clear skies, and some star charts, you can observe incredible celestial objects, like nebulae and galaxies, that Hubble has photographed…
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What’s Up in Denver? September 29th through October 5th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. September 29: Denver Astronomical Society E-Board Meeting: Virtual via Zoom (check membership email or Slack for details): 7:00 PM First Quarter Hunter’s Moon: 5:54 PM September 30: Look for the waxing gibbous Hunter’s Moon next to the Summer Rose Star globular cluster (M51) in the constellation Sagittarius low in the southwest: 10:00 PM October 1: Catch the waxing gibbous Hunter’s Moon next to the M 75 globular cluster in the constellation Capricornus in the southern sky: 10:00 PM DAS Astrophotography Special Interest Group (ASIG) – General &…
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What’s Up in Denver? September 22nd through 28th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. September 22 (Autumnal Equinox): Astronomy on Tap – Boulder with Dr. KaChun Yu, Dr. Jane Bright, Dr. John Keller, and Marcel Corchado: Rayback Collective: 6:00 PM September equinox is the time when the Sun reaches the point along the ecliptic where it crosses into the southern celestial hemisphere marking the start of autumn in the Northern Hemisphere and spring in the Southern Hemisphere: 12:19 PM September 23: Look for the waxing crescent Harvest Moon near Spica in the constellation Virgo low in the western sky…
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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.