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Principal meridian: Map

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A meridian is an imaginary line on the Earth's surface from the North Polemarker to the South Polemarker that connects all locations with a given longitude. Each is half of a great circle on the Earth's surface. A principal meridian is the principal north-south line used for survey control in a large region.

Canada

The Dominion Land Survey of Western Canada took its origin at the First (or Principal) Meridian, located at 97°27′28.41″ west of Greenwich, just west of Winnipeg, Manitobamarker.

Six other meridians were designated at four-degree intervals westward, with the seventh located in British Columbia; the second and fourth meridians form the general eastern border and the western border of Saskatchewanmarker.

United States

In the United Statesmarker Public Land Survey System, a principal meridian is the principal north-south line used for survey control in a large region, and which divides townships between east and west. The meridian meets its corresponding baseline at the point of origin, or initial point, for the land survey. For example, the Mount Diablo Meridian, used for surveys in California and Nevada, runs north-south through the summit of Mount Diablomarker.

Often, meridians are marked with roads, such as the Meridian Avenue in San Jose, Californiamarker, Meridian Road in Vacaville, Californiamarker, both on the Mount Diablo Meridian, Meridian Road in Wichita, Kansasmarker on the Sixth Principal Meridian, and Meridian Avenue in several western Washington counties generally following the Willamette Meridian. Baseline Rd or Base Line St. extends for about 40 miles from Highland, CA (east of San Bernardino) to La Verne, CA where it meets Foothill Blvd.

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