From Wikipedia: https://en.wikipedia.org/wiki/Edwards_Air_Force_Base
Also painted on the dry lake beds near Dryden is the world's largest compass rose: 2,000-foot (610 m) radius, 4,000 feet (0.76 mi; 1.22 km) in diameter. The Edwards AFB compass rose's magnetic declination to true north is measured by Google Earth's distance/direction measurement tool as inclined to magnetic north with a 15.3 degrees east variance of true north, as opposed to the current variance of 12.4 degrees east (2014.) This is consistent with a calculated magnetic variance at this location in the early 1960s. The larger lake bed, Rogers, encompasses 44 square miles (110 sq km) of desert. Because of Rogers' history in the space program, it was declared a National Historic Landmark.

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