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? August 18th through 24th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. August 18: Catch the waning crescent Strugeon Moon next to a trio of open clusters in Auriga—M36, a compact cluster about 4,100 light-years away with roughly 60 hot, young blue stars; M37, the brightest and richest of the three, boasting several hundred stars and a sprinkling of striking red giants about 4,500 light-years distant; and M38, a looser, X-shaped cluster about 4,200 light-years away that contains dozens of stars of varying brightness, offering a gorgeous contrast in the eyepiece: 4:00 AM August 19: Look for…
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What’s Up in Denver? August 11th through 17th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. August 11: DAS Monthly General Meeting: “Footloose Astronomer in Europe: On the Trail of Telescope History” presented by Dr. Phil Kelton McDonald Observatory (Retired): In-person at Regis University’s Peter Claver Hall, Room 315 or Zoom (check your membership email): 7:00 – 9:00PM August 12: Catch the conjunction of our two brightest planets – Venus and Jupiter are within a degree of each other – low in the early morning eastern sky in Gemini: Around 4:30 AM Look for the waning gibbous Sturgeon Moon next to…
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Summer’s Most Spectacular Show: The Perseid Meteor Shower

What Is a Meteor Shower? A meteor shower happens when Earth travels through a stream of debris left behind by a comet or asteroid. When these tiny bits of rock and dust enter our atmosphere, they burn up and create bright streaks of light in the sky. These are called meteors — or more commonly, shooting stars. What Causes the Perseids? The Perseids come from debris left by Comet Swift-Tuttle. Each summer, Earth passes through this trail of dust. As those tiny particles hit our atmosphere at high speeds, they burn up and create those brilliant streaks we love to…
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What’s Up in Denver? August 4th through 10th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. August 4, 5 & 6: Look for the Waxing gibbous Sturgeon Moon to visit the Teapot asterism in the constellation Sagittarius low in the southern sky on the 4th, 5th, and 6th of August around 11:00 PM. August 6: NSN Webinar Series: 2025 International Observe the Moon Night: Youtube Livestream and Recording: 7:00PM Special DAS E-Board Meeting (to discuss the date and location of the holiday banquet): Check your DAS membership email for Zoom link: 7:00 PM Astrophotography Special Interest Group (ASIG) General and Beginner…
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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.