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



Open Houses


An Open House in the Fall

PLEASE NOTE: Use of Observatory Park by the DAS for public outreach astronomical observing has been verbally approved by the Denver Parks and Recreation Dept. However, strict rules concerning vehicle access by DAS members must be followed.
(See the October Open House Event Page)

Are you trying to decide which of the many telescopes on the market is right for you? Are you wondering what’s the difference between a “Dobsonian” telescope and a refractor? Or … what the heck is a “Schmidt-Cassegrain” telescope, anyway? We have discovered that one of the best ways to get the answers to those questions is to look through and try out a number of different scopes.

Or … are you a student who needs information for an assignment; a parent who has a child with an interest in astronomy; a teacher who wants to enrich her student’s science classes; a person who wants to find out how to get started as an amateur astronomer .. or who just wants to spend an interesting evening exploring something new?

You’re in luck! Almost every month, starting around dusk, on the Saturday nearest the first quarter moon, the DAS hosts an Open House at the University of Denver’s Historic Chamberlin Observatory. Guests can view the heavens through the observatory’s famous 20-inch aperture Alvan Clark-Saegmuller refractor and/or telescopes attended by DAS members on the south lawn of the observatory. There’s also a special area for children and adults (“Learner’s Land”) to learn how to operate both child & adult-friendly telescopes, assisted by DAS volunteers.

Enter the observatory through the south door and check in at the desk on the main floor of the observatory. The cost is $2 per person or $5 per family (cash only, please). If the weather is cloudy and not suitable for viewing with the observatory’s telescope, there is a reduced $1 per-person entry fee for an observatory tour. DU students with ID, and DAS members are free.

Please see: Observatory Safety Rules & Access Considerations |

A bonus on Open House nights is that many Denver Astronomical Society members set up their telescopes on the south lawn of Observatory Park to share with anyone and everyone interested in taking a look at the wonders of the universe — stars, planets, galaxies, nebulae, star clusters and more! (There is no charge for viewing through DAS member telescopes.)

Members are happy to answer any and all questions about astronomy and their telescopes so you can start to explore the heavens on your own or learn which type of scope might be right for you and your interests.

If you already have a telescope, but can’t quite figure out how it works, not to worry: bring it to the Open House and someone will help you.

Dates and start times for this year’s Open Houses are provided in the Calendar and the event list on the right side of this Web page.

The start time for Open Houses varies as evening twilight changes with the seasons. In the Winter, plan to be there by 5:30 or 6:00 pm. In the Spring and Fall, 6:30 or 7:30 pm is about right. In the Summer months, 8:00 or 9:00 pm. If you arrive early, you can watch DAS members set up their telescopes and other equipment for the night’s observing.