Earth ellipsoid | Wikipedia audio article
Channel: wikipedia tts
Date: 15/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Earth_ellipsoid


00:01:16 1 Types
00:02:55 2 Historical method of determining the ellipsoid
00:05:09 3 Historical Earth ellipsoids
00:08:51 4 See also



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SUMMARY
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An Earth ellipsoid is a mathematical figure approximating the  Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences. Various different ellipsoids have been used as approximations.
It is an ellipsoid of revolution whose minor axis (shorter diameter), which connects the geographical North Pole and South Pole, is approximately aligned with the Earth's axis of rotation. The ellipsoid is defined by the equatorial axis a and the polar axis b; their difference is about 21 km, or 0.335%. Additional parameters are the mass function J2, the correspondent gravity formula, and the rotation period (usually 86164 seconds).
Many methods exist for determination of the axes of an Earth ellipsoid, ranging from meridian arcs up to modern satellite geodesy or the analysis and interconnection of continental geodetic networks. Amongst the different set of data used in national surveys are several of special importance: the Bessel ellipsoid of 1841, the international Hayford ellipsoid of 1924, and (for GPS positioning) the WGS84 ellipsoid.