Geodetic position and line-of-sight at a given distance
ecef (Vector3) – Start position (x,y,z)
decef (Vector3) – Normalised direction vector (dx,dy,dz)
ell (Vector2) – Ellipsoid (a,b)
l (Numeric) – The distance
pos (~pyarts3.arts.Vector3) – Geodetic position (h,lat,lon)
los (~pyarts3.arts.Vector2) – Geodetic line-of-sight (za,aa)