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Navy Precision Optical Interferometer (NPOI)

(6) Observatory in Coconino County, Arizona
The Navy Precision Optical Interferometer is an American astronomical interferometer, with the world's largest baselines, operated by the Naval Observatory Flagstaff Station in collaboration with the Naval Research Laboratory and Lowell Observatory.
Address: Anderson Mesa, Flagstaff, AZ 86001
Phone: (928) 773-4868