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  2. 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.

  3. Geographic coordinate conversion - Wikipedia

    en.wikipedia.org/wiki/Geographic_coordinate...

    The formulas involved can be complex and in some cases, such as in the ECEF to geodetic conversion above, the conversion has no closed-form solution and approximate methods must be used. References such as the DMA Technical Manual 8358.1 [15] and the USGS paper Map Projections: A Working Manual [16] contain formulas for conversion of map ...

  4. Sunrise equation - Wikipedia

    en.wikipedia.org/wiki/Sunrise_equation

    In the equation given at the beginning, the cosine function on the left side gives results in the range [-1, 1], but the value of the expression on the right side is in the range [,].

  5. Help kids learn local geography from home with this clever ...

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  6. Geodetic coordinates - Wikipedia

    en.wikipedia.org/wiki/Geodetic_coordinates

    Geodetic latitude and geocentric latitude have different definitions. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure).

  7. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    Pace [6] in minutes per kilometre or mile vs. slope angle resulting from Naismith's rule [7] for basal speeds of 5 and 4 km / h. [n 1]The original Naismith's rule from 1892 says that one should allow one hour per three miles on the map and an additional hour per 2000 feet of ascent.

  8. Geomathematics - Wikipedia

    en.wikipedia.org/wiki/Geomathematics

    Many geophysical data sets have spectra that follow a power law, meaning that the frequency of an observed magnitude varies as some power of the magnitude.An example is the distribution of earthquake magnitudes; small earthquakes are far more common than large earthquakes.

  9. GeoSafari - Wikipedia

    en.wikipedia.org/wiki/GeoSafari

    Educational Insights, Inc. released the GeoSafari electronic geography teaching aid in 1987. It was later re-released by Educational Insights, Inc. in 1990. The system uses two-sided, laminated cards that fit into the front of the machine. The center of the card has numbered elements that correspond to the answers, and the sides of the card ...