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.

June

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? 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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Celebrating the 2025 Van Nattan-Hansen-Anderson Scholarship Winners

Each year, the Denver Astronomical Society (DAS) awards the Van Nattan-Hansen-Anderson Scholarship to support promising students in astronomy, astrophysics, and related sciences. We are proud to introduce this year’s recipients, each of whom is pursuing their passion for the universe in unique and inspiring ways. Meet the 2025 Scholarship Recipients Jessica JohnsonJessica is a junior at the University of Northern Colorado, majoring in physics with a concentration in astronomy. Inspired by a childhood love of Star Wars, she now pursues her dream of becoming an astronomer/astrophysicist. She is active in the Society of Physics Students, enjoys science fiction, music, and…
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Test Your Eyesight on the Moon: William Henry Pickering’s 12 Features

Who Was William Henry Pickering? William Henry Pickering (1858–1938) was an American astronomer celebrated for his careful studies of the Moon, planets, and comets. He earned his early training at Harvard and later became a professor of astronomy at MIT, where he taught and conducted research for many years. Pickering also played a role in the early development of what would become the Jet Propulsion Laboratory (JPL), applying his knowledge of celestial mechanics to space exploration projects. Among his many discoveries, he found Saturn’s moon Phoebe and several comets, and he was an early adopter of photography for astronomical research.…
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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.