Third principal meridian

The third principal meridian begins at the mouth of the Ohio River and extends north to the northern boundary of the state of Illinois, and with the base line in latitude 38° 28′ 20″, governs the surveys in the state east of the third principal meridian, with the exception of those projected from the second principal meridian, and the surveys on the west, to the Illinois River. This meridian is nearly coincident with 89° 10′ 15″ of west longitude from Greenwich.

External links

"The Third Principal Meridian". Principal Meridian Project. Retrieved 2012-09-15.
"Third Principal Meridian". The Center for Land Use Interpretation. Retrieved 2012-09-15.
"Historic Marker: The Third Principal Meridian". Illinois State Historical Society. Retrieved 2012-09-15.

Source

Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Google Books). New York: American Book Company.
"Chapter Five: Land Surveying". Survey Manual. Springfield, Illinois: Illinois Department of Transportation, Bureau of Design and Environment. 2003-02-28. p. 5–5. Retrieved 2008-10-30.

Principal meridians of the United States

Numbered meridians	First Second Third Fourth Fourth (extended) Fifth Sixth

Named meridians	Black Hills Boise Chickasaw Choctaw Cimarron Copper River Gila and Salt River Humboldt Huntsville Indian Louisiana Michigan Mount Diablo Navajo New Mexico Montana St. Helena meridian St. Stephens Salt Lake San Bernardino Tallahassee Uintah Umiat Ute Washington Willamette Wind River

List of principal and guide meridians and base lines of the United States

Coordinates: 38°28′26″N 89°08′40″W / 38.47389°N 89.14444°W / 38.47389; -89.14444