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Calculate k0 for WGS84/GRS80.

Calculates the value of k0, which represents the flattening of the ellipsoid (ratio between major and minor axes) used to model the Earth. The value returned is for the WGS 84 system, which is the same as the GRS 80 system within the accuracy used. For further details, refer to Table 1, p.12 of Snyder (1987). (see above for biblio details.)