Joani's research of "things to see" in Casa Grande, AZ, revealed a long-held secret hidden (in plain sight) in the desert near our park, Sundance 1 RV Resort. The Corona Satellite Calibration Targets are abandoned relics of the Cold War of the 60s.
I could not help but feel the huge concrete "targets" were probably a waste of money. There must have been a better way to calibrate satellite instruments. Like visiting a desert ghost town, I imagined all of the people working on this project many years ago and wondered what they thought of the effort.
While researching "must see Casa Grande" I ran across an article about the Corona Satellite Calibration Targets.
The article gave the location for two of the crosses. I looked on Google Earth and, sure enough, there they were.
While trying to find our way back to paved roads, we found another one. At one time there were 144 targets spread out in a grid across the desert.
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