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First principal meridian : ウィキペディア英語版 | First principal meridian
The first principal meridian is a meridian that began〔While civil boundaries and rivers can "move," surveying meridians and monuments remain "fixed."〕 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. ==See also==
*List of principal and guide meridians and base lines of the United States
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「First principal meridian」の詳細全文を読む
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