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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Cloudspotting on Mars: Become a Martian Weather Watcher from Home

Welcome back to our series on NASA’s Citizen Science projects! In our last post, we explored Galaxy Zoo, where you can help classify galaxies from deep space. This time, we’re staying a little closer to home—on Mars! Well, not on Mars exactly, but you’ll be helping scientists study its skies in a project called Cloudspotting on Mars: Shapes. This is your chance to become a Martian weather watcher, no spacesuit required. What is Cloudspotting on Mars? Cloudspotting on Mars is a project hosted on the Zooniverse platform where you look at real data from NASA’s Mars Reconnaissance Orbiter (MRO). The…
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What’s Up in Denver? May 26th through June 1st, 2025

Here’s a brief look at what’s going on in the Mile High City this week. May 26 – Memorial Day: The Moon reaches perigee – its closest point to us in its orbit around Earth – at 2 UTC when it’s 223,085 miles (359,022 km) away. New Strawberry Moon: 9:02 PM May 27: Check out the day old waxing crescent Strawberry Moon next to Jupiter in the constellation Taurus just after sunset. Astrophotography Special Interest Group (ASIG) – General Meeting for DAS Members: 7:00 PM (more info). May 28: DAS MakerSIG Meeting: 7:00 (Zoom) Look for the waxing Strawberry Moon…
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Exploring the Universe without a Telescope: Galaxy Zoo and NASA’s Citizen Science Projects

Have you ever wanted to help scientists explore the universe? Good news—you can! This blog post is the first in a fun new series from the Denver Astronomical Society (DAS) all about NASA’s Citizen Science projects. These are real science projects that anyone can join, no matter their age or experience. All you need is curiosity and a little time. In each post, we’ll show you how you can help NASA make discoveries, starting with one of our favorite projects: Galaxy Zoo! What is Galaxy Zoo? Galaxy Zoo is a super cool project where you help scientists sort and study…
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What’s Up in Denver? May 19th through 25th, 2025

Here’s a brief look at what’s going on in the Mile High City this week. May 19: DAS E-Board Meeting: 7:00 PM – Zoom May 20: Last Quarter Flower Moon: 5:58 am May 21: Even though we’re a month away from the summer solstice, you can tell that summer is imminent when the Summer Triangle asterism begins to rise earlier in the eastern night skies. The Summer Triangle is formed by three bright stars—Vega in the constellation Lyra, Altair in Aquila, and Deneb in Cygnus—that create a large, nearly equilateral triangle and serve as celestial signposts to their respective constellations…
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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.