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National UFO Reporting Center
Sighting Report
Occurred : 12/18/2006 00:01 (Entered as : 12/18/06 00:01)
Reported: 12/17/2006 9:20:17 PM 21:20
Posted: 2/1/2007
Location: Joshua Tree Nat'l Park, CA
Shape:
Duration:
Mojave Desert Mystery Circles are actually an old Military Bomb Target

In regards to the photo and report you have of strange circles in a dry lake bed I believe that I have the answer. The circles and line appear clearly in Google Earth at latitude 34.152137, longitude -115.573694. The line appears to eminate from the exact center of the circles and point due north. The outer circle is 400' in diameter, and the inner circle is 200' in diameter. The line is 500' long.

An entry in Google Earth Community shows a location marker very near there titled: "SHEEP HOLE MOUNTAINS SONIC BOMB TARGET #2". It seems very likely to me that these circles are either the bomb target itself, or a landmark pointing towards the target - but in either case it was obviously placed there for military practice.

I believe that this "mystery" has been solved.