First principal meridian
The first principal meridian is a meridian that began 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.
- 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 Google Books). New York: American Book Company.
- Linklater, Andro. Measuring America.
- "Cadastral Survey". U.S. Bureau of Land Management. Retrieved 2012-09-29.
- "Cadastral Survey, Principal Meridians and Base Lines". U.S. Bureau of Land Management. Retrieved 2012-09-29.
- "First Principal Meridian, Monroeville, IN". Principal Meridian Project. Retrieved 2012-09-29.
- "First Principal Meridian". The Center for Land Use Interpretation. Retrieved 2012-09-29.
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