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pv2s, pv, theta, phi, r, td,
pd, rd
[SOFA] Converts position/velocity vector pv (which has 2
elements in its first dimension and 3 elements in its second
dimension) from Cartesian to spherical coordinates. The output
parameters are: theta = longitude in radians,
phi = latitude in radians, r = radial
distance, td = rate of change of theta, pd =
rate of change of phi, rd = rate of change
of r. The output variables get the same dimensions as
pv except that the first two dimensions (equal to 2 and
3) are omitted.