First_principal_meridian

First principal meridian

First principal meridian

Survey line

The first principal meridian is a meridian that began[1] at the junction of the Ohio River and Great Miami River. It extends north on the boundary line between the states of Ohio and Indiana, and roughly approximates to the meridian of longitude 84° 48′ 50″ west from Greenwich. The ranges of the public surveys in the state of Ohio, west of the Scioto River, are (in part) numbered from this meridian.

U.S. Bureau of Land Management map showing the first four principal meridians

See also

References

  1. [1]
    While civil boundaries and rivers can "move," surveying meridians and monuments remain "fixed."
  • Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Internet Archive). New York: American Book Company.

40°59′21.74″N 84°48′11.69″W

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