Great Conjuction - December 21, 2020

The observatory is closed, but this is a great naked-eye event.  Jupiter will be the brightest object in the southwestern sky, but will set by 7:30 pm.  Binoculars can help resolve the two planets.  Keep watching for the next few nights to log them as they separate.

Observatory closed until further notice!

In an abundance of caution for our visitors and volunteers, the observatory is temporarily closed for public viewing.  Any further updates will be made via this site and our Facebook page.

Keep looking up at the stars!



SUNSET - 9:30 PM

(weather permitting)


Located at 2757 E Guadalupe Road in the Gilbert Riparian Preserve next to the Gilbert Library at Greenfield and Guadalupe.

Cost: Free

Donations welcome. Suggested donation $5/family or $3/adult.

Public Hours

*weather permitting

Friday Evening:      Sunset - 9:30 PM

Saturday Evening:  Sunset - 9:30 PM


public star party

Every 2nd Friday: Sunset - 9:30 PM

Additional telescopes supplied by members of the East Valley Astronomy Club are available for free public viewing, plus an astronomy related talk in the adjoining public library at 7:30 PM.

private viewing

Available by reservation Sunday - Thursday, maximum 20 people.

Cost of $5/person, minimum of $45. Organized youth groups working on astronomy awards may be eligible for fee waiver.


Special events

From time to time the observatory is open for special events and solar viewing.

Find out more about special events on the calendar.


All Events Cancelled Until Further Notice

Observatory Etiquitte

We ask that viewers do not physically touch the telescope or eyepiece (it is tempting for viewers of all ages) because the telescope is always moving by computer control, and touching will cause the image to shake.


Please refrain from using flashlights or looking at your cellphones during your visit to the observatory. The best viewing is obtained when your eyes are “dark adapted”. We use red lights to assist your night vision, and looking at bright lights will instantly cause your eyes to react and lose the ability to more easily see fainter objects.


Flash photography is not allowed.


The observatory staff will choose objects that are available for viewing that evening. We will try to see several objects during an evening, but that is dependent on the number of people waiting in line.


Please feel free to stay and watch our educational videos on the patio as you wait.

Ask our volunteers any astronomy related question that is on your mind, but please be respectful of other guests who are waiting to view.

The Moon & Planets

Evening Planets

(after sunset)

  • Mars

  • Uranus

  • Neptune

  • Jupiter and Saturn set early evening

Morning Planets

(before sunrise)

  • Venus


(before sunrise)

none currently visible



Quadrantid - Jan. 1 - 5

Phases of the Moon​

January 13

10:00 PM

First Quarter Moon
January 20

6:02 PM

January 28

12:16 PM

Last Quarter Moon
January 6

6:37 AM


Clear Sky Chart

Contact Us