Mount Diablo meridian

The Mount Diablo meridian, established in 1851, is a principal meridian extending north and south from its initial point atop Mount Diablo in California at W 121° 54.845. Established under the U.S. Public Land Survey System, it is used to describe lands in most of northern California and all of Nevada.[1] Mount Diablo also marks the baseline at latitude 37°52′54″N.[2]

Mount Diablo Memorial Marker
Summit beacon tower atop Mt. Diablo. The initial point marker lies within this tower.

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