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  2. Epicentral distance - Wikipedia

    en.wikipedia.org/wiki/Epicentral_distance

    [Notes 5] In order to keep the result from being negative, Richter defined an earthquake with a maximum horizontal displacement of 1 μ m (which is also the highest accuracy and precision of the Wood Anderson torsion seismometer) recorded by the seismometer at the observation point at the epicentral distance of 100 km as a magnitude 0 ...

  3. Great-circle navigation - Wikipedia

    en.wikipedia.org/wiki/Great-circle_navigation

    Great Circle Map Interactive tool for plotting great circle routes on a sphere. Great Circle Mapper Interactive tool for plotting great circle routes. 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 ...

  4. Valeriepieris circle - Wikipedia

    en.wikipedia.org/wiki/Valeriepieris_circle

    A Valeriepieris circle [1] [2] [3] is a figure drawn on the Earth's surface such that the majority of the human population lives within its interior. 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 ]

  5. Blue Marble Geographics - Wikipedia

    en.wikipedia.org/wiki/Blue_Marble_Geographics

    Blue Marble's first software product, the Geographic Calculator, [2] was developed in 1992 and released in 1993. The Geographic Calculator is a coordinate conversion library with a database of coordinate mathematical objects including projections, coordinate systems, datums, ellipsoids, linear and angular units. The tool is primarily used to ...

  6. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    Methods for computing the geodesic distance are widely available in geographical information systems, software libraries, standalone utilities, and online tools. The most widely used algorithm is by Vincenty , [ 10 ] who uses a series which is accurate to third order in the flattening of the ellipsoid, i.e., about 0.5 mm; however, the algorithm ...

  7. 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.

  8. Homeownership is getting unaffordable for the middle class - AOL

    www.aol.com/finance/homeownership-getting...

    Nevertheless, as Moore notes, “it’s probably the best tool in our toolbox” when it comes to building generational wealth. It’s the groups that have historically been excluded from ...

  9. 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 ...