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Kitt Peak, Arizona

The 4-meter (158 inch) Nicholas U. Mayall Telescope was one of the largest optical telescopes in the world and is named for the former Director of the Kitt Peak National Observatory. The eighteen story Mayall Telescope, located just below the summit of Kitt Peak at 6875 feet, can be seen from over fifty miles away. Construction of the building to house the massive telescope began in 1968 and was completed in late 1970. The dedication was held three years later after completion of the telescope. The dome weighs 500 tons and has a double shell structure, permitting it to withstand hurricane force winds of 120 miles per hour. The telescope's 15 ton primary mirror is polished to one millionth of an inch and has a reflective aluminum coating one thousandth the thickness of a human hair.

Aperture: 3.8 meters   Latitude: 31.963444
First light: Longitude: -111.600183
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Elevation: 2100 meters