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2. Great-circle navigation - Wikipedia

   en.wikipedia.org/wiki/Great-circle_navigation

   The distance along the great circle will then be s 12 = Rσ 12, where R is the assumed radius of the Earth and σ 12 is expressed in radians. Using the mean Earth radius , R = R 1 ≈ 6,371 km (3,959 mi) yields results for the distance s 12 which are within 1% of the geodesic length for the WGS84 ellipsoid; see Geodesics on an ellipsoid for ...

3. Washington Metro - Wikipedia

   en.wikipedia.org/wiki/Washington_Metro

   Actual map of the Washington Metro. Map of the network is drawn to scale. Since opening in 1976, the Metro network has grown to include six lines, 98 stations, and 129 miles (208 km) of route. [78] The rail network is designed according to a spoke–hub distribution paradigm, with rail lines running between downtown Washington and its nearby ...

4. Haversine formula - Wikipedia

   en.wikipedia.org/wiki/Haversine_formula

   d is the distance between the two points along a great circle of the sphere (see spherical distance), r is the radius of the sphere. The haversine formula allows the haversine of θ to be computed directly from the latitude (represented by φ) and longitude (represented by λ) of the two points:

5. Interstate 495 (Massachusetts) - Wikipedia

   en.wikipedia.org/wiki/Interstate_495_(Massachusetts)

   Interstate 495 (I-495) is an auxiliary route of I-95 in the US state of Massachusetts, maintained by the Massachusetts Department of Transportation (MassDOT). Spanning 121.56 miles (195.63 km), it is the second-longest auxiliary route in the Interstate Highway System, being roughly 11 miles (18 km) shorter than I-476 in Pennsylvania.

6. Yahoo Maps - Wikipedia

   en.wikipedia.org/wiki/Yahoo_maps

   Multi-point driving directions: Multiple addresses can be entered and manually reordered for complex driving directions. Draggable maps: The map view can be manipulated by dragging it with the mouse or tapping the arrow keys. Zoom level can be controlled via the mouse scroll wheel, "Page Up"/"Page Down" keys, or the map's zoom bar. Widgets: A ...

7. 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.