metre
EPSG
DMA Technical Manual 8350.2-B
2015-11-25
1/f derived from four defining parameters semi-major axis; C20 = -484.16685*10e-6; earth's angular velocity ω = 7292115e-11 rad/sec; gravitational constant GM = 3986005e8 m*m*m/s/s. In 1994 new GM = 3986004.418e8 m*m*m/s/s but a and 1/f retained.