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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).
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Geodesy, also called Bomford's Geodesy, [1] is a textbook on geodesy written by Guy Bomford. Four editions were published, [ 2 ] in 1952, 1962, 1971, and 1980 respectively. [ a ] Bomford retired in 1966, though continued publishing editions of the book.
The shortest path between two points on a spheroid is known as a geodesic. Such paths are developed using differential geometry. The equator and meridians are great ellipses that are also geodesics [a]. The maximum difference in length between a great ellipse and the corresponding geodesic of length 5,000 nautical miles is about 10.5 meters.
Thus, geodesy represents the figure of the Earth as an oblate spheroid. The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis. It is the regular geometric shape that most nearly approximates the shape of the Earth.
Online geodesic bibliography of books and articles on geodesics on ellipsoids. Test set for geodesics, a set of 500000 geodesics for the WGS84 ellipsoid, computed using high-precision arithmetic. NGS tool implementing Vincenty (1975). geod(1), man page for the PROJ utility for geodesic calculations. GeographicLib implementation of Karney (2013).