Navy Prototype Optical Interferometer

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The Navy Prototype Optical Interferometer (NPOI) is an interferometer operated by the US Naval Observatory, the Naval Research Laboratory and The Lowell Observatory. The facility is located on Anderson Mesa about 15 miles southeast of Flagstaff, Arizona. To date it has produced the highest resolution optical images of any astronomical instrument (this is likely to change when the CHARA array and Magdalena Ridge Observatory Interferometer begin operations). The first astronomical object imaged by NPOI was Mizar.

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Main articles

Single dish	Arecibo Observatory (Puerto Rico) · Effelsberg (Germany) · Green Bank Telescope (West Virginia, USA) · Lovell Telescope (UK) · Parkes Observatory (Australia)

Interferometers	Giant Metrewave Radio Telescope (India) · MERLIN (UK) · Molonglo Observatory Synthesis Telescope (Canberra, Australia) · One-Mile Telescope (UK) · Very Large Array (New Mexico, USA) · Very Long Baseline Array (USA) · Westerbork Synthesis Radio Telescope (Netherlands)