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2. Great-circle navigation - Wikipedia

   en.wikipedia.org/wiki/Great-circle_navigation

   Great Circle Calculator deriving (initial) course and distance between two points. Great Circle Distance Graphical tool for drawing great circles over maps. Also shows distance and azimuth in a table. Google assistance program for orthodromic navigation

3. Great-circle distance - Wikipedia

   en.wikipedia.org/wiki/Great-circle_distance

   A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them. This arc is the shortest path ...

4. Haversine formula - Wikipedia

   en.wikipedia.org/wiki/Haversine_formula

   The haversine formula determines the great-circle distance between two points on a sphere given their longitudes and latitudes.Important in navigation, it is a special case of a more general formula in spherical trigonometry, the law of haversines, that relates the sides and angles of spherical triangles.

5. Bearing (navigation) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(navigation)

   Thus, 32 points of 11.25° each makes a circle of 360°. An object at 022.5° relative would be 'two points off the starboard bow', an object at 101.25° relative would be 'one point abaft the starboard beam' and an object at 213.75° relative would be 'three points on the port quarter'. This method is only used for a relative bearing.

6. Vincenty's formulae - Wikipedia

   en.wikipedia.org/wiki/Vincenty's_formulae

   Vincenty's formulae are two related iterative methods used in geodesy to calculate the distance between two points on the surface of a spheroid, developed by Thaddeus Vincenty (1975a). They are based on the assumption that the figure of the Earth is an oblate spheroid, and hence are more accurate than methods that assume a spherical Earth, such ...

7. Geographical distance - Wikipedia

   en.wikipedia.org/wiki/Geographical_distance

   Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...