| 词条 | Third principal meridian |
| 释义 |
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
|url=http://www.pmproject.org/3pm.htm |publisher=Principal Meridian Project |title=The Third Principal Meridian |accessdate=2012-09-15}}
|url=http://www.clui.org/section/third-principal-meridian |publisher=The Center for Land Use Interpretation |title=Third Principal Meridian |accessdate=2012-09-15}}
|url=http://www.historyillinois.org/FindAMarker/MarkerDetails.aspx?MarkerID=385 |publisher=Illinois State Historical Society |title=Historic Marker: The Third Principal Meridian |accessdate=2016-10-28}} Sources
| last = Raymond | first = William Galt | title = Plane Surveying for Use in the Classroom and Field | url = https://books.google.com/books?id=68I3AAAAMAAJ&dq | format = via Google Books | date = 1914 | publisher = American Book Company | location = New York
| url = http://www.dot.state.il.us/desenv/survey/chap5.pdf | title = Survey Manual | publisher = Illinois Department of Transportation, Bureau of Design and Environment | location = Springfield, Illinois | date = 2003-02-28 | chapter = Chapter Five: Land Surveying | pages = 5–5 | accessdate = 2008-10-30 }}{{Principal meridians of the United States}}{{coord|38|28|26|N|89|08|40|W|format=dms|display=title|type:landmark_region:US-IL}} 2 : Meridians and base lines of the United States|Lines of longitude |
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