Mount Diablo meridian

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

The Mount Diablo meridian, established in 1851, is the main surveying reference point for much of northern California and Nevada. The initial point is the summit of Mount Diablo.

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Coordinates: 37°52′54″N 121°54′51″W / 37.88167°N 121.91417°W / 37.88167; -121.91417