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%I #15 May 14 2019 21:22:55
%S 6,3,7,8,1,3,7
%N Decimal expansion of the semi-major axis (in meters) of the World Geodetic System 1984 Ellipsoid, second upgrade.
%C Closely aligned with ITRF93, Sep 29 1996 onwards.
%C The new World Geodetic System is called WGS 84. It is currently the reference system being used by the Global Positioning System. It is geocentric and globally consistent within +-1 m.
%D H. Moritz, Geodetic Reference System 1980, Journal of Geodesy 74 (1): 128-162, 2000. (not WGS 84)
%D Thaddeus Vincenty, Direct and inverse solutions of geodesics on the ellipsoid with application of nested equations, Survey Review XXII (176): 88-93, 1975.
%H Office of GEOINT Sciences, <a href="http://earth-info.nga.mil/GandG/wgs84/">World Geodetic System 1984 (WGS 84)</a>.
%H U.S. Dept. of Commerce, NOAA, National Geodetic Survey, <a href="http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf">Survey Review</a>, Thaddeus Vincenty, Direct and Inverse Solutions of Geodesics on the Ellipsoid with Application of Nested Equations, Vol. XXIII, No. 176, April, 1975. (an application)
%H U.S. Dept. of Defense, National Imagery and Mapping Agency, <a href="ftp://164.214.2.65/pub/gig/tr8350.2/wgs84fin.pdf">Technical Report, WGS 1984, Its Definition and Relationships with Local Geodetic Systems</a>.
%H U.S. Dept. of Transportation, Federal Aviation Administration, <a href="http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/633cd6cd012d5336862569e7006daa1a/$FILE/Appx%20E-J.pdf">Advisory Circular 90-45A, Appendix J, Computation of Geodesic Information, 2/21/75</a>.
%H WGS, <a href="http://www.wgs84.com/">World Geodetic System, 1984</a>.
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/World_Geodetic_System">World Geodetic System</a>.
%e a = semi-major axis = 6378137 meters.
%t (* first do *) Needs["GeometricalGeodesy`ReferenceEllipsoids`"] (* then *) IntegerDigits@ semiMajor@ WGS84 (* incomplete coding completed by _Robert G. Wilson v_, Apr 17 2010 *)
%Y Cf. A125124, A125125, A125126.
%K cons,nonn
%O 7,1
%A _Robert G. Wilson v_ and Thomas H. Meyer, Nov 21 2006
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