Welcome to Dark Sky Observing, the web presence of Apache-Sitgreaves Research Center, an independent research institution located in Overgaard, Arizona.

Our mission; to pursue the study of astronomy, especially the study of the outer solar system, and to conduct pure and applied research of stellar astrophysics in Arizona along with outreach programs that keep the focus relevant.

Located on top of the Colorado Plateau in Northern Arizona along with Lowell Observatories in Flagstaff and Anderson Mesa, and the 4.2-meter Discovery Channel Telescope in Happy Jack, the Apache-Sitgreaves Research Center in Overgaard, Arizona is located at a world class dark sky site at just under 7000 feet elevation.

The skies are not only extremely dark but very transparent, with sub-arcsecond seeing on most nights.

The Apache-Sitgreaves Research Center Plan

A decadal plan for future equipment and science that will be carried out.


Pictures and details of all my scopes.

Overgaard Star Party

Overgaard Star Party info plus pictures from years past.


News that turns into history.

Observing Notes

Observations with the 20" and 36" scopes (see also the Wizard's Challenge link at the bottom of this page).


How much snow?!?

Recent Visitors

Humans, Elk, Deer, Coyotes, Wolf, Cougar, Javelina, Birds, and other Critters.

Moon and Sun

Current Moon Phase and Solar Activity.

Cool Road Trips...

Steward Mirror Lab, Meteor Crater, Lowell Observatory, Mt. Graham, and, the Discovery Channel Telescope....

Steven L. Aggas

Avid visual observer and telescope builder.

Thanks for stopping by.

If it's up there..., it's in here....jpg

The Wizard's Challenge....

A challenging observing list.

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