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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 ...
The New Castle Court House Museum is the center of a circle with a 12-mile radius that defines most of the border between the states of Delaware and Pennsylvania and parts of the borders between Delaware and New Jersey and Maryland. [3] It is one of the oldest courthouses in the United States and has played a role in a number of historic events.
A 12-mile (radius) circle (12 mi (19 km)) around the city of New Castle, Delaware. A "tangent line" connecting the midpoint of the transpeninsular line to the western side of the 12-mile circle. A "north line" along the meridian (line of longitude) from the tangent point to the Maryland-Pennsylvania border.
Even though the Wedge is outside the Twelve-Mile Circle, because it is south of the 39° 43′ N compromise line, it should not be part of Pennsylvania. Mason and Dixon actually began surveying the Maryland–Pennsylvania border line at the Delaware River, or at least fixed the longitude of the intersection of 39° 43′ N and the river.
He also resolved the questions that had stopped the first round of Commissioners, determining that the center of the circle would be the center of New Castle, the circle would have a 12-mile radius, and Fenwick Island (rather than Cape Henlopen) would be used as the southern boundary as agreed upon in the 1732 agreement. [6]
The Transpeninsular Line (at approximately 38°27′ N) is a surveyed line, the eastern half of which forms the north–south border between Delaware and Maryland. The border turns roughly north from the midpoint of the line towards the Twelve-Mile Circle, which forms much of the remainder of the Delaware land border.
The Delaware Boundary Markers historic district is located along the state boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania.The district includes 94 contributing sites along the Mason–Dixon line and includes the Transpeninsular Line, Post Marked West site, Tangent Line, the Arc Corner, and the Twelve-Mile Circle.
Delaware County is a county located in the central portion of the U.S. state of Ohio.As of the 2020 census, the population was 214,124. [3] Its county seat and largest city is Delaware. [4]