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Save the Date! 100 Year Anniversary Celebration

How a Trio of Observatories Around Tucson is Changing Astronomy

The “Tucson Triangle” is the greatest collection of scopes and spectrographs in the continental U.S.

Amid the burning Arizona sands, three peaks form a triangle of superlatives surrounding Tucson. Atop Mount Graham sits the world’s largest optical telescope. Mount Hopkins is home to North America’s second-largest single-mirror telescope. And Kitt Peak contains the continent’s largest single collection of mountaintop astronomical instruments. More Information.

For the public
For Public

Public events include our Monday Night Lecture Series, world-reknowned Astronomy Camp and Mt Lemmon Sky Center.

For Students

A good place to start if you want to become an undergrad major or grad student, or need to find our schedule of classes.


For Scientists
For Scientists

Find telescopes and instruments, telescope time applications, staff and mountain contacts, and faculty and staff scientific interests.