Corona Satellite Calibration Marker

USA / Arizona / Arizona City /

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One of 272 markers which formed a 16x16 mile grid, used from 1959 to 1972 to calibrate the Corona spy satellite cameras.
Map of 145 remaining markers : goo.gl/mhQ6IP

Wikipedia article: https://en.wikipedia.org/wiki/Corona_Satellite_Calibration_Targets

Nearby cities:

Coordinates: 32°48'25"N 111°43'19"W

U.S. Navy Loom Lobby Ordinance Range 393 km
Borrego Valley Manuever Area 438 km
Galway Lake 484 km
Wreck of USS Magnet (ADG-9) 588 km
San Clemente Island 644 km
Simulated Warsaw Pact Tactical Air Base 690 km
Target Airfield 697 km
Antioch Bombing Target (site) 1069 km
Impact Zone 3166 km
Long Shoal Naval Ordnance Area 3312 km

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