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In reality, the east-west Mason–Dixon line is not a true straight line in the geometric sense, but is instead a polygonal chain, a series of many adjoining line segments, following a path between latitude 39°43′15″ N and 39°43′23″ N.
The Mason–Dixon line – another line linked to the slave-free division in the U.S. Royal Colonial Boundary of 1665 – the border between the Colony of Virginia and the Province of Carolina that follows the parallel 36°30′ north latitude that came to be associated with the Missouri Compromise of 1820.
Ten minutes away, at Mason-Dixon Farms on Mason-Dixon Road, a stone sits within smelling distance of a crowded corral of cows. The last stone we visit lies beside a bunch of black-eyed Susan in a ...
Mostly because of the difficulty of surveying the Twelve-Mile Circle tangent point and the Tangent Line, astronomer Charles Mason and surveyor Jeremiah Dixon were hired. This complex border became known as the Mason–Dixon line. There turned out to be a small wedge of land between 39° 43′ N latitude, the Twelve-Mile Circle, and the North Line.
The stone was placed by Mason and Dixon about 700 feet (213 m) north of the Harlan House, which was used as a base of operations by Mason and Dixon through the four-and-a-half-year-long survey. Selected to be about 31 miles (50 km) west of the then southernmost point in Philadelphia , the observatory was used to determine the precise latitude ...
In the 18th Century, Mr Mason and fellow English astronomer Jeremiah Dixon, from County Durham, were commissioned to chart a boundary line intended to settle a long-running dispute between the ...
The Twelve-Mile Circle Diagram of the Twelve-Mile Circle, the Mason-Dixon Line, and The Wedge. The diagram shows the survey lines involved in the disputes, not current borders. The Twelve-Mile Circle is an approximately circular arc that forms most of the boundary between Delaware and Pennsylvania. It is a combination of different circular arcs ...
Pennsylvania's border was thus unclear and the colony pushed for a border far south of the 40th parallel. The Mason–Dixon Line was drawn between 1763 and 1767 as the compromise boundary between the overlapping claims of these two colonies. 40th parallel marker at Ohio State University (Columbus, Ohio)