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  2. Twelve-Mile Circle - Wikipedia

    en.wikipedia.org/wiki/Twelve-Mile_Circle

    It is nominally a circle with a variable radius of approximately 12 miles (19 km) centered in the town of New Castle, Delaware. [3] In 1750, the center of the circle was fixed at the cupola of the courthouse in New Castle. The Twelve-Mile Circle continues into the Delaware River.

  3. New Castle Court House Museum - Wikipedia

    en.wikipedia.org/wiki/New_Castle_Court_House_Museum

    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.

  4. Mason–Dixon line - Wikipedia

    en.wikipedia.org/wiki/Mason–Dixon_line

    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.

  5. Penn–Calvert boundary dispute - Wikipedia

    en.wikipedia.org/wiki/Penn–Calvert_boundary...

    1732 map of Maryland [13] The cupola of the New Castle Court House was used as the center of the Twelve Mile Circle; the boundary Commissions met here numerous times over the years. The discovery that the Twelve Mile Circle did not actually intersect with the 40th parallel, and that the parallel was actually north of Philadelphia , Pennsylvania ...

  6. U.S. Route 36 in Ohio - Wikipedia

    en.wikipedia.org/wiki/U.S._Route_36_in_Ohio

    North of the city, after meeting SR 31, SR 4 leaves the expressway bypass. At the next exit, US 36 also leaves the expressway. On its way to Delaware, US 36 meets New Dover, Ostrader, and SR 257. Between the Ohio Wesleyan University and the Olentangy River in Delaware, US 36 meets US 23/US 42, beginning a short concurrency with US 42.

  7. Transpeninsular Line - Wikipedia

    en.wikipedia.org/wiki/Transpeninsular_Line

    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.