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  2. Valeriepieris circle - Wikipedia

    en.wikipedia.org/wiki/Valeriepieris_circle

    The concept was originally popularized by a map posted on Reddit in 2013, made by a Texas ESL teacher named Ken Myers, whose username on the site gave the figure its name. [4] Myers's original circle covers only about 10% of the Earth's total surface area, with a radius of around 4,000 kilometers (2,500 miles), centered in the South China Sea. [1]

  3. Twelve-Mile Circle - Wikipedia

    en.wikipedia.org/wiki/Twelve-Mile_Circle

    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 that have been feathered together. [1] [2] It is nominally a circle with a variable radius of approximately 12 miles (19 km) centered in the town of New Castle, Delaware. [3]

  4. Washington, D.C., Special Flight Rules Area - Wikipedia

    en.wikipedia.org/wiki/Washington,_D.C.,_Special...

    Effective February 9, 2009, any pilots flying VFR within a 60-nautical-mile (110 km) radius centered on the ADIZ are required to complete training about the ADIZ. This training can be completed online through a course called "Navigating the New DC ADIZ" (now "DC Special Flight Rules Area"). [ 16 ]

  5. 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.

  6. 45th parallel north - Wikipedia

    en.wikipedia.org/wiki/45th_parallel_north

    Map all coordinates using OpenStreetMap. Download coordinates as: ... The 45th parallel north is a circle of latitude that is 45 degrees north of Earth's equator. It ...

  7. Mercator projection - Wikipedia

    en.wikipedia.org/wiki/Mercator_projection

    With radius and great circle circumference equal to 6,371 km and 40,030 km respectively an RF of ⁠ 1 / 300M ⁠, for which R = 2.12 cm and W = 13.34 cm, implies that a ruler measurement of 3 mm. in any direction from a point on the equator corresponds to approximately 900 km. The corresponding distances for latitudes 20°, 40°, 60° and 80 ...

  8. Geographical mile - Wikipedia

    en.wikipedia.org/wiki/Geographical_mile

    In any ellipsoid, the length of a degree of longitude at the equator is exactly 60 geographical miles. The Earth's radius at the equator in the GRS80 ellipsoid is 6,378,137.0000 m, [3] which makes the geographical mile 1,855.3248 m. The rounding of the Earth's radius to metres in GRS80 has an effect of 0.0001 m.

  9. Columbus Circle - Wikipedia

    en.wikipedia.org/wiki/Columbus_Circle

    For decades, Hagstrom sold maps that showed the areas within 25 miles (40 km) [137] or 75 miles (121 km) from Columbus Circle. [138] The travel area for recipients of a C-2 visa, which is issued for the purpose of immediate and continuous transit to or from the headquarters of the United Nations, is limited to a 25-mile radius of Columbus ...

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