DAS Activities

DAS Public Nights

Public Nights
Tuesday and Thursday at
DU's Historic Chamberlin Observatory
Current start time is 8:30 pm.

Costs to the public are:
$4.00 adults, $3.00 children

To book, please click:

Public Night Reservations



About the DAS

One of the nation’s largest and most active astronomical societies … since 1949!

The Denver Astronomical Society’s hosts over 145 outreach activities each year, bringing the fascination, perspective, wonder, and joy of astronomy to thousands of children, teens and adults in the Denver metropolitan area. DAS provides trained volunteers (certified by the University of Denver) who host Public Nights and Open Houses at the University of Denver’s Historic Chamberlin Observatory, which the DAS helped place on the National Register of Historic Places. First light at Chamberlin in 1894 was a public night of viewing, a tradition the DAS has helped maintain since 1949.

The DAS is a long-time member in good standing of the Astronomical League, the International Dark Sky Association, the NASA/JPL Night Sky Network, the Antique Telescope Society and Western Area Astronomers

Our mission is to promote the enjoyment and understanding of astronomical history, lore and phenomena by providing educational and observing opportunities for our members, education to the general public, and outreach activities at the University of Denver’s Historic Chamberlin Observatory and other venues.

See the DAS 2018 Calendar for the dates of society activities during the year. The NASA-JPL Night Sky Network Calendar also displays public information on DAS activities.

The DAS holds monthly meetings featuring outstanding presentations on a wide array of astronomical topics for its members and the public. These meetings feature opportunities to socialize and (except for society functions in March and December) are free of charge and open to the general public .

After an orientation on a Dark Sky (new moon) Weekend, members in good standing have full access to our Edmund G. Kline Dark Site near Deer Trail, Colorado, now equipped with a warming hut, fourteen 10-ft x 10-ft observing pads with electricity, and a vault toilet.

The Brooks Observatory at the Dark Site features a 14-inch Celestron Schmidt-Cassegrain telescope on a Losmandy G-11 Gemini mount.

The society’s public outreach activities include monthly open houses and twice-weekly public observing nights at Chamberlin Observatory, as well as lecture and star party programs for local schools and organizations.

The Society’s Van Nattan-Hansen Scholarship Fund provides support to qualifying Denver-area students seeking degrees in astronomy, space-science and related programs.

The DAS is also active in the preservation of DU’s Historic Chamberlin Observatory, spearheading the drive for its listing on the Register of Historic Places and recent renovation activities, including an extensive optical surface cleaning and mechanical renovation of the historic 20-inch Alvan Clark-Saegmuller refractor.

The DAS is a 501(c)(3) tax-exempt corporation and has established three tax-deductible funds:

Society Communication

Denver Observer
The DAS publishes The Denver Observer, a monthly newsletter that provides society news, observing and imaging tips, book reviews, star party reports, and scientific information on astronomy and space science. Members are notified of publication and it is available for the public online.

An archive of current and past issues is maintained on the Observer page of this Web site.

Social Media and DAS Yahoo Group

  • The DAS maintains Facebook and Twitter pages for members and the public
  • The DAS Member Portal is available to all members in good standing, providing a way to exchange information, post images, and learn about Dark Site and other society activities. The portal is also open to those who wish to donate to the society or purchase classified items in the DAS store.
  • Members who opt-in are sent Email announcements of newsletter publication, General Meeting topics, and special events.
  • The DAS also maintains a YouTube channel for videos of society meetings, events, and astronomical activities of interest.


The Denver Astronomical Society is proud to be affiliated with the following organizations:

  • The Astronomical League
  • The International Darksky Association
  • The Antique Telescope Society
  • Western Amateur Astronomers
  • The NASA Night Sky Network

For Trustee and committee contact information, see the DAS Officers and E-Board page.