Tools for working with points and paths on (a spherical model of) the earth’s surface using a
vector-based approach using ‘n-vectors’ (rather than the more common spherical trigonometry;
a vector-based approach makes many calculations much simpler, and easier to follow, compared
with trigonometric equivalents).
Note on a spherical model earth, an n-vector is equivalent to a normalised version of an (ECEF)
cartesian coordinate.
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