The ellipsoid's two radii of curvature at a geodetic latitude, in
kilometres: along the meridian, and the prime vertical's, square to it,
which is the distance along the normal from the surface to the polar
axis. A degree of latitude there is the first's, and a degree of
longitude the second's times the cosine of the latitude.
The ellipsoid's two radii of curvature at a geodetic latitude, in kilometres: along the meridian, and the prime vertical's, square to it, which is the distance along the normal from the surface to the polar axis. A degree of latitude there is the first's, and a degree of longitude the second's times the cosine of the latitude.