POSTPONED - Astronomy Day 2020

POSTPONED --- Join us to celebrate 30 years of Hubble Space Telescope! FREE family-friendly activities, telescope observing, special talks, scale solar system tours, stomp rockets, comet labs, telescope observing, light labs, and planetarium shows focused on Hubble's discoveries. Come for an hour or two or stay all day. Rescheduled date TBD.

Public Open Houses

Free open houses are held on Friday evenings at 8:00 p.m. (9:00 p.m. during CU summer sessions) when CU classes are in session (during the spring, summer A & B, and fall semesters.)

SBO Public Event.

SBO public event on the observing deck.

Open houses are only held when the skies are clear. If you're not sure if we'll be open, check out our local weather with instructions for calling ahead. 

There is no charge for the Observatory's Open House nights ... the stars are free to everyone!

Sessions typically last from 1-3 hours, depending upon the weather, the quality of the night, and the enthusiasm and size of the crowd (if unsure of observing status call 303.492.2020). Please stop by anytime after we open and stay as long as you wish.

We also have tripod-mounted binoculars and the world's largest starwheel (well, at least we think it is) for identifying bright stars and constellations. Depending upon the staffing on a particular night, we may be able to offer you a chance to visit the 24-inch telescope ... that mysterious tube hiding hiding inside the dome ... as well additional smaller telescopes set up on the open deck for looking at the Moon and other bright celestial objects.

Most of our evening programs are hosted by the APS Department's graduate students, with an occasional faculty professor, researcher, local amateur astronomer, and/or undergraduate volunteer on hand.

Date of Observing Time of Observing Lunar Phase (% Illumination)

Jan 24, 2020

8:00 P.M.

1%  Illumination

Waning Crescent 0%

Waning Crescent - New Moon

Jan 31, 2020 8:00 P.M.  31% Illumination

Waxing Crescent 30%

Waxing Crescent

Feb 7, 2020 8:00 P.M.

93% Illumination

Waxing Gibbous 90

Waxing Gibbous

Feb 14, 2020 8:00 P.M.

72% Illumination

Waning Gibbous 70%

Waning Gibbous

Feb 21, 2020 8:00 P.M.

7% Illumination

Waning Crescent 10%

Waning Crescent

Feb 28, 2020 8:00 P.M.

16% Illumination

Waxing Crescent 20%

Waxing Crescent

Mar 6, 2020 8:00 P.M.

81% Illumination

Waxing Gibbous 80

Waxing Gibbous

Mar 13, 2020 8:00 P.M.

85% Illumination

Waning Gibbous 80%

Waning Gibbous

Mar 20, 2020 CANCELLED

17% Illumination

Waning Crescent 20%

Waning Crescent

Apr 17, 2020 CANCELLED

30% Illumination

Waning Crescent 30%

Waning Crescent

Apr 24, 2020 CANCELLED

1% Illumination

Waxing Crescent 0

New Moon - Waxing Crescent